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UBC Theses and Dissertations

Recovery of cobalt from concentrates supplied by Kelowna exploration co., ltd. Hall, James Z. Greer 1941

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THE  UNIVERSITY O F BRITISH C O L U M B I A VANCOUVER,  OF  C A N A D A  MINING  3 ^  U)  ^  r  -  ^  IOSC OVER?  OF  COBALT  from Concentrates Supplied by Kelovma Exploration Co. by James Z.G-. H a l l  A Thesis submitted i n p a r t i a l fulfilment of The Requirements f o r the Degree of MASTER OF JffiPLIED SCIENCE i n the Department of METALLURGY  The University of B r i t i s h Columbia A p r i l 1941  INDEX Page INTRODUCTION . . . . . . . . . . . . . . . . . . . . . 1.  1  Treatment of Raw Concentrates D i r e c t l y with .  3  (A) Low Sulphur, Low Arsenic Calcines. . . . . .  3  (B) High Sulphur, Low Arsenic Calcines  4  (C) Comparison of Calcines .  5  Sulphuric Acid . 2 . PRELMINART ROASTING-.  5.  4.  TREATMENT OF LOW SULPHUR, LOW ARSENIC CALCINES . . (A) Mainly with Salt and Sulphuric Acid  6  (B) Mainly with Sulphuric Acid  7  (C) Mainly with S a l t  8  (D) Mainly with Hydrochloric Acid. . . . . . . .  8  TREATMENT OF HIGH SULPHUR, LOW ARSENIC CALCINES. . (A) Mainly sulphatizing roast aided by Sulphuric Acid  9  (B) Mainly sulphatizing roast aided by S a l t . . .  10  (C) Mainly sulphatizing roast aided by Hydrochloric Acid . . . . .  . . . . . .  (D) Mainly sulphatizing roast  10 11  5.  PRECIPITATION OF COBALT from LEACH SOLUTIONS . . .  11  6.  SUMffiRY OF RESULTS  12  7.  CONCLUSION  13  8.  TESTING PROCEDURES . . . . . . . . . . . . . . . .  14  9.  ASSAY PROCEDURES  16  10. TESTS . • 11. REFERENCES 12. AOENOWLEDGEMENTS . . . . . . . . . . . . . . . . .  22 64 64  PRODUCTION  , •  The Kelowna Exploration Concentrate consists p r i n c i p a l l y of a mixture of Arsenopyrite (FeAsS) and pyrrhotite (Fe S ) containing x x X from 5 % to 10 $ of gangue (SiO ). In addition the concentrate contains the following elements* Au  — —  Ag  1.1 oz/ton  (approx)  0.25 oz/ton  Cu  —  Co  "  0.6. - 1.4 % 0.6 - 0.8 %  Now the gross value of t h i s concentrate i s r Au  ™  1.1 oz ® 35.00 — - •  S3.50  Co — - •  0.6 % - 12#/ton @ 1.50 — -  18.00  Cu  0.6 % - 12#/ton @  —  .12  1.50 58.00 — —  58.00  Returns when shipping the concentrate to Tacoma: Gross Yalue of Au plus Cu  40.00  Freight, Treatment, etc Net Return  '•-  •Now Gross value including Cobalt Present Net Return — •  —-  16.00  —  24.00  >——  •—-«—  Therefore, value available f o r Treatment  24.00  58.00 24.00 34.00  34.00 58.00  Thus i n considering a treatment method, i t ' s cost including Au and Co losses, overhead, amortization, etc., should be kept down to about $25.00 per ton i f a reasonable and certain p r o f i t i s to be shown.  This research on the concentrates was undertaken with the following objects i n view. (1) to determine whether the Cobalt could be profitablyextracted i n a marketable form. (2) t o determine whether a suitable recovery of the Au content could be obtained i n the course of the Cobalt extraction. The values contained i n s i l v e r and copper are of secondary  importance  and t h e i r recovery was considered as l i k e l y to p a r a l l e l that of the other metals.  TREATMENT OF RAW  CONCTBNTRATES WITH STJLPHORIC ACID  Preliminary work carried out i n the ore dressing and metallurgical laboratories of the Department of Mines and Resources i n Ottawa during July and August 1940, under the supervision of Mr. F.A. Forward, indicated that treatment of the concentrate d i r e c t l y with hot strong sulphuric acid might offer a suitable solution to the problem of recovering both cobalt and gold from the concentrates.  The f i r s t  f i v e (5) tests were devoted to t h i s method of treatment and t h e i r general procedure and reasons are as follows: (1) Concentrate added to strong b o i l i n g H SO REASON: to convert cobalt, copper to water soluble sulphatesjat the same time freeing the gold so that i t may be cyanided. In attaining t h i s r e s u l t iron was converted to an undesirable water soluble sulphate. (2) F i l t e r the"Quiescent Mixture"while hot.  • REASON: Arsenic interferes with the recovery of cobalt and t h i s serves as one simple method of eliminating the arsenic because Arsenious Oxide (ASgOg) i s soluble i n hot acid. Moreover the. acid i s easily freed of the As 0 because i t settles out on cooling. (5) The Precipitate i s given an oxidizing roast below . 725°C. REASON: The undesirable water soluble iron sulphate i s converted to insoluble iron oxide (Feg0 ) between 600 - 7B5°C. whereas the water soluble cobalt and copper sulphates remain unchanged. 3  The best recovery from this series of tests was 93 fo recovery of cobalt. Further work on sulphatihg raw concentrates was d i s continued because an experiment on roasted calcines performed by Mr. Alfred G-. Lyle proved s u f f i c i e n t l y attractive to warrant further investigation.  PRELIMINARY ROASTING(A) Low Sulphur, Low Arsenic. Low sulphur and low arsenic calcines were obtained by an oxidizing roast of the concentrates.  These roasts were  carried out under two different conditions. The f i r s t by placing the concentrates i n a moderately hot furnace (500-550°0.) and gradually r a i s i n g the temperature up to between 750 and 850°C.  The second by placing the concentrates  d i r e c t l y into the furnace at 750-850° C.  I t was  found the gradual  r a i s i n g of the temperature adversely affected the elimination of arsenic. These roasts were continued at the higher temperatures u n t i l completely roasted.  (B) High Sulphur, Low Arsenic. High sulphur and low arsenic calcines were obtained by a reducing roast of the concentrates.  These roasts were  obtained by placing the concentrates  d i r e c t l y into a hot  furnace (750-850C.) and cutting short the roasting time; stopping when the arsenic flame died and cooling i n a confined atmosphere.  This type of roast may be properly  described as a "reducing roast" because during the arsenic elimination the concentrates of arsenic vapor.  are enveloped by an atmosphere  For a comparison of the r e s u l t i n g calcines  from t h i s type of roast to the foregoing oxidizing roast note the following chart.  H H Ol Ol  H CD O  o H  H -3 O • to  CO o to • CO  9  H CO  m  o  o  H O  H Ol  If'  o •  CO H  a>  o o •  Ol  1  CO H CP CO «  CD  9  o  o • Ol  CP Ol  1 O  o !  co H o  03 O O  •  H  oi o  -a  o  -a oi  CO •03  H CT>  H  o o o  CO  »t* o> Ol  o o o  CO  «  CO Ol -a  H>  a> jr->  e  o  o  o  H i ; a CP  Oi  o • CO  Ol  • to  H  O  1  o  O  CO  O O  03  CP to -a  -CI  ;  H C O O  o o o  CO  Ol  S3  o  CJI  Ol  «  CP  -<! - O  H CO  o o o  CO  P  H> Oto.CO F- O CO cf P O O 4 O (D H HiW Pi CD I - W O g CD O g pj I—' C D CD :•: ^ O p. p pi J3tfl O F- CD p- I* CD W O CD P R • I I I  H to CP • to  o »H H  I Ol Ol  1  1  CP  o  H  o  Ol  S3 -3  Ol  -a  00 O O  o  O  03  H 03 O  o o o  CO  03 CO Ol  00 CO Ol  cp  CO 8  o o o  I—1  CO  CO  o o o  CP  O H • to  CO S3  H «  O C P • o>  Ol  !  H  S3 Ol G  O  Ol  S3  CP CO  • • .  H 0 0 CP  o o o  CP  ro H  CO  CO H  P.  O ci-  i-3  Ol •  CP  CO  •  H  O •  H O o> 9  o  o  o  (  H  00 CO Ol  o o  CO  CP o *  o  Ol -•a  o o o  H  1  CO  o  CO CP  CO  o o  CP  la  «  te-  Ol  CP  I1—'  1  o o o  CO  CO  1  1  H  CP Ol Ol tJ o 9 p cn 4 Ol CO o • O  o  o CO Ol  o  «  -a CO  o «  CO o> If. o  o o  co  o  O CO  te-  cr>  o  CO CO  o  o  03  -v! Ol  CP  Ol Ol  o o o  CO  Ol Ol  la  •CO  te-  H Ol O! H  o o o  CO  H  »  o  CO •  Ol «  -a o o  o o  Ol  CP to •  c r> O  o o o  82  1-3  co  I co CO  CD  • 3  Cfl H-  B  1  "? p.  >-3 fej  Co  b  I  § o  H CO  5  o 9  § 2  o ? P.  CO  P.  <+ tJ  P.  =S OS  o  o  CD CO  H3  (C) Comparison of calcines. (1} Slowly oxidizing dead roasts, started at low temperature and finished at high temperature. These roasts gave moderately high arsenic and low sulphide sulphur.  See Tests 14 and  18A.  (2) Rapid oxidizing dead roasts e n t i r e l y carried out at high temperatures.  These roasts gave very low  arsenic and low sulphide sulphurs. (3) Reducing roasts carried out at high temperature and cooled i n open atmosphere.  These roasts gave  low arsenics and moderately high sulphide sulphures (12%).  See Tests 30A and  34A.  (4) Reducing roasts carried out at high temperatures and cooled i n confined atmosphere.  These roasts  gave low arsenic and high sulphide sulphur (21$). See tests 40A to 44A i n c l u s i v e .  6  TREATMENT OF'LOW SULPHUR, LOW ARSENIC CALCINES (A) MAINLY WITH SALT AND SULPHURIC ACID This treatment i n general was conducted as follows: (1) Mixed the preliminary calcine with varying percentages of s a l t and s u f f i c i e n t sulphuric acid t o thoroughly wet a l l the calcine. (2) Roasted t h i s mixture at a moderate temperature (500-550*0.) to allow the sulphuric acid and salt time to react and form primary sulphates. (3) Ground these primary sulphates to pass through an 80 mesh screen and gave them an oxidizing roast at temperatures varying from 600 - 700°C.  This would  break up water soluble iron sulphate into water i n soluble i r o n oxide ( F e 0 ) . g  3  For further d e t a i l s of t h i s treatment method see the following t e s t s : No.9G2  No. 14G  No. 141  No.160  N0.I8B  90  9G3  14D  14J  16H  19B  9D  10C  14E  14N  16J  20C  9E  10G  14F  140  17A  22G  9F  15  14H  16B  17B  No. 8  At f i r s t these treatments embodied the use of small percentages of carbon which were thought to help i n the elimination of arsenic by reducing the stable arsenic compounds to the more v o l a t i l e areenious compounds.  However there was not s u f f i c i e n t advantages gained by i t s  use and so i t s addition was discontinued i n l a t e r treatments. Tests 14B, 14C, 14D, 14E, 14F and 14M show that good recoveries may  be  obtained by t h i s treatment.  For example i n Test 14C the use of 5 fo  s a l t and 80 % strong sulphuric acid and roasted not above 650° 0. gave 92 % water soluble cobalt.  I t should be noted that heating the  primary sulphates from 550 to 650°C. decomposed the water soluble iron sulphate.  This decomposition released sulphur t r i o x i d e which had a  m i l d sulphating action; increasing the recovery of the cobalt and copper by forming additional water soluble sulphates of these metals.  (B) MAINLY WITH StJLFHURIO ACID This treatment method was carried out i n general, as follows: (1) Added s u f f i c i e n t sulphuric acid to thoroughly moisten the preliminary calcine. (2) Roasted the mixture at a moderate temperature  (500 - 550C.)  to allow formation of primary sulphates. (3) Ground these primary sulphates to minus 80 mesh and gave them an oxidizing roast to break up i r o n sulphate to water insoluble iron oxide (FegO^). For d e t a i l s and r e s u l t s see t e s t s : No. 10B  No.  14B  10D  14ff  10E  20D  10F The best recovery that was obtained by t h i s method was 82 % of the cobalt i n Test No. 20D„  (G.) MAENLY WITH SALT , This treatment method i n general was simply a chloridizing roast.  The tests were carried out at varying temperatures  from 350° C. up to 650°C.  For r e s u l t s and details see  tests: •No. 6  No. 21D  9B  22B  The best recovery obtained by t h i s method was 72 % i n Test No. 21D. Where the c h l o r i d i z i n g roasts were carried out at temperatures exceeding 450°C. the recovery was very poor because the cobalt chloride was broken down to water insoluble cobalt oxide. (D) MAINLY WITH HYDROCHLORIC ACID This treatment i n general was carried out as follows: (1) Calcine was mixed with s u f f i c i e n t hydrochloric acid to moisten i t thoroughly. (2) This mixture was slowly dried at a low temperature and roasted below 450° C.  At t h i s temperature any  water soluble iron chloride formed i s broken down to water insoluble i r o n oxide (Fe 0 ) while water soluble cobalt and copper remain unchanged. For results and d e t a i l s see tests: No. 21B  No. 22N  No. 31B  210  24A  31C  21M  24B  33D  22G  240  32B  This treatment gave f a i r recoveries of copper and cobalt especially i n Test No. 24A, where only 1G % hydrochloric acid was used, gave a 72 fo recovery of cobalt.  This treat-  ment i s p a r t i c u l a r l y attractive because of i t s simplicity and the low temperatures involved.  TREATMENT OF HIGH SULPHUR, .LOW ARSENIC CALCINES (A) MAINLY BYjSULPHATIZING- ROAST AIDED BY SULPHURIC ACID This treatment i n general was use of the high,sulphide  a sulphatizing roast making  sulphur content of the calcines  augmented by sulphuric a c i d .  These roasts were carried out  at moderately low-temperatures (350 - 450° C.) sulphating action was  When  complete the temperature was  raised to  650°C. to break up any water soluble iron sulphate. For d e t a i l s and r e s u l t s see t e s t s : No. 40D  No.  40E  40G40K  I t should be noted that the f i n a l roasting at the higher temperature to break up soluble i r o n sulphate resulted i n higher cobalt recoveries as experienced i n the treatment of low sulphur, low arsenic calcines with s a l t sulphuric a c i d .  See page 6.  The best recovery was soluble cobalt.  and  Test No.  40E which gave 74 fo water  ,(B) MAINLY'BY SIILEHAT1ZING ROAST AIDED BY SALT This treatment i n general was as follows: (1) Calcine mixed with small percentage of s a l t . 12 (2) Calcine given a sulphating roast at low temperatures 350 - 450° C. (3) Calcine given, an oxidizing roast at higher temperature (625°C.) to decrease soluble iron and increase soluble cobalt. For details and results see tests: No. 30C  No. 41B  No. 440  No. 45F  40H  42B •  44D  45G-  40N  43B  44E  45B  The best recovery was i n t e s t 40N which gave 90 fo recovery of the cobalt with but l i t t l e i n t e r f e r i n g water soluble i r o n .  (0) MAINLY BY SOLFBATlZING- ROAST AIDED BY HYDROCHLORIC ACID This treatment i n general was carried out as i n foregoing sulphatizing roast aided with s a l t excepting that s a l t i s replaced by Hydrochloric Acid.  For summary of results and  d e t a i l s see tests: 30B, 540„ 34D. The best recovery was obtained i n Test No. 30B which gave 82 fo recovery of the cobalt. However an excessive amount of hydrochloric acid was required to a t t a i n t h i s high recovery.  (D) MAINLY BY SULPHATIZINGThis treatment involved only the use of the high  sulphide  sulphur content of the preliminary calcines to e f f e c t a sulphating roast.  This roast was carried out at a low  temperature (550°C.) under a c l o s e l y controlled atmosphere. "When the sulphating action i s complete the temp, i s raised (625°C.) t o effect the decomposition of water soluble iron sulphate,taking advantage of the released sulphur t r i o x i d e to give a "secondary sulphating" action.  For details and  results see t e s t s : Ho. 40B  No. 40F  40C  45E  No. 45K  The best test, 45K, gave 68 fo recovery of the cobalt.  PRECIPITATION OF COBALT FROM LEACH SOLUTION The recovery of cobalt from the water leach solutions i s easily obtained by standard practise.  In evidence of t h i s t e s t s No. 23,  23B, 23C were run and gave i n the order of 98 % recovery of the cobalt as cobalt carbonate.  This i s e a s i l y converted into a  marketable cobalt oxide product by caleing.  There i s nothing to  indicate that t h i s phase of the work w i l l present any d i f f i c u l t i e s .  SUMMARY OF RESULTS (1) Although good recoveries were indicated by treatment of raw concentrates with excess sulphuric acid, the complexity of t h i s operation i n comparison to the simplicity of treatment of roasted concentrates made t h i s method very unattractive. (2) In the treatment of low sulphur, low arsenic calcines, the best recoveries were obtained by the use of salt and sulphuric acid.  However, i n spite of the lower recoveries obtained by  the use of hydrochloric acid alone, this treatment was more attractive than the s a l t and sulphuric acid treatment because of i t s comparative  simplicity.  (3) In the treatment of high sulphur low arsenic calcines the best recovery was obtained by the use of s a l t i n aiding the sulphating action.  However, i n spite of the lower recoveries,  s ^ ^ s s i = ^ f sulphating the calcines with the omission of any reagents, i s favored,because: (A) Simplified treatment. (B) Elimination of gold loss by chloridization, (4) The best treatment of the high sulphur low arsenic calcines by sulphating action alone, i s preferred to the best treatment of the low sulphur low arsenic calcines with hydrochloric acid because: (1) Simplified treatment. (2) Elimination of gold loss by c h l o r i d i z a t i o n .  (5) Recovery of the cobalt from the leach solutions i s standard practise and w i l l offer no d i f f i c u l t i e s as shown by test No. 23. (6) Preliminary work on cyanidation of leached residues, indicated that no d i f f i c u l t y w i l l be encountered i n obtaining good gold recoveries,  CONCLUSION From an analysis of the results embodied i n this research, i t may be concluded that by a combination of reducing and sulphatizing roasts a p r a c t i c a l and simple method of extracting the cobalt from the concentrates,  at the same time freeing the gold so that i t i s amenable  to cyanidation, i s possible.  14.  TESTING PROCEDURES P i c t u r e d below i s a 13 K.W. has  e l e c t r i c r e s i s t a n c e f u r n a c e which  automatic temperature c o n t r o l .  Nearly a l l the r o a s t i n g both preliminary  and s u l p h a t i z i n g  was c a r r i e d out i n t h i s furnace.  Note t h e h o l e i n  t h e back o f t h e f u r n a c e through which t h e pyrometer i s i n t r o d u c e d . The s i l i c a t r a y commonly used i s s i t t i n g on t o p o f b r i c k s but  unfortunately  both are d i f f i c u l t t o distinguish i n this picture. E x h i b i t No. 1  The p i c t u r e t o t h e l e f t shows t h e u s u a l p o s i t i o n o f t h e door when e i t h e r preliminary  or sulphatizing  r o a s t i n g was b e i n g c a r r i e d on.  E x h i b i t No. 2  The h i g h s u l p h u r low a r s e n i c r o a s t s were u s u a l l y c a r r i e d out i n an open s i l i c a t r a y p l a c e d i n t h e f u r n a c e as p e r s k e t c h below.  The  t r a y was i m m e d i a t e l y covered w i t h an a s b e s t o s board when withdrawn from t h e f u r n a c e .  T h i s gave t h e s o - c a l l e d "confined-atmosphere" t o  the cooling c a l c i n e . S u l p h a t i z i n g r o a s t s on t h e c a l c i n e s were l a t t e r l y c a r r i e d out i n a s i l i c a t r a y which was p a r t i a l l y covered by an a s b e s t o s board as shown below i n t h e s k e t c h .  C r o s s S e c t i o n of Furnace  16.  The l e a c h i n g o f c a l c i n e s was c a r r i e d o u t i n a beaker as p i c t u r e d i n t h e l e f t o f E x h i b i t No. 3.  Note t h e h e a t e r t h a t t h e beaker i s  s e t t i n g on and t h e m e c h a n i c a l s t i r r e r used f o r a g i t a t i o n o f t h e p u l p .  No 5. The  e l e c t r i c f u r n a c e p i c t u r e d t o t h e r i g h t i n E x h i b i t No. 3  might b e n o t i c e d .  T h i s f u r n a c e was used f o r i g n i t i n g t h e f i n a l  p r e c i p i t a t e s o f t h e c o b a l t and s u l p h u r a s s a y s , t h e procedures o f w h i c h s h a l l now b e g i v e n i n d e t a i l .  ASSAY PROCEDURES I t i s f e l t t h a t a complete e x p o s i t i o n o f t h e assay procedures i s not j u s t i f i e d i n t h i s r e p o r t so o n l y t h e b a r e o u t l i n e s a r e i n c l u d e d . F o r f u r t h e r d e t a i l s on p r e p a r a t i o n s  o f s t a n d a r d s e t c . any textbook  on a s s a y i n g may be c o n s u l t e d . \  There i s i n many t e x t b o o k s on a s s a y i n g an a l t e r n a t i v e e l e c t r o l y t i c  method f o r t h e a s s a y o f c o b a l t .  I t might be worthy o f n o t e t h a t  this  method was t r i e d , b u t because o f t h e i n t e r f e r i n g e f f e c t o f manganese, i t was found u n s a t i s f a c t o r y .  Weigh out 1 or 2 gms Ore or calcine. Add 10-15 c.c. HC1 - digest u n t i l oxides i n solution. Add 3-5 c.c. chlorate mixture, slowly evaporate t o dryness and bake. Add 3-5 c.c. HC1, again take to dryness and bake. Add 1-3 c.c. HC1. Add 100 c.c. H 0. 2  &  Gas with HgO f o r 5-10 minutes. Bring just to b o i l . Gas again with HgS f o r 3-5 minutes. F i l t e r - Precipitate to copper assay. B o i l f i l t r a t e to eliminate HgS gas.  Add 10-15 c.c. 3 % HgOg. Pour into 500 c.c. volumetric f l a s k . Add ZnO emulsion to precipitate i r o n -'"'cool. Add HgO to 500 c.c. mark. F i l t e r o f f 250 c.c. into 250 c.c. v o l . f l a s k . Transfer to 400 c.c. beaker. Add 6 c.c. HC1. B o i l u n t i l a l l Og expelled. Add 25-50 c.c. HAc. Add Nitrosobetanaphthol (10 c.c. of 10 % solution f o r every 25 Mg Co present). F i l t e r - Ignite precipitate (700-900 C.) Weigh as C o 0 Weight x 0.734 = weight of cobalt. 3  4  (Nitrosobetanaphthol solution must be f r e s h l y prepared by dissolving the right amount of Nitrosobetanaphthol i n g l a c i a l acetic acid.)  •18.  WATER SOLUBLE COBALT (W.S. Co) Weigh out 5 gms calcine. Add 100 c.c. HgO and b o i l 10 minutes and f i l t e r Add 3-5 c.c. HC1 to f i l t r a t e Gas with HgS gas etc. Proceed as i n Cobalt- assay of ores.  See A .  ACID SOLUBLE COBALT (A.S. Co) '  Weigh out 5 gms calcine. Add 100 c.c. H 0 g  Add 1 c.c. cone. HgS0 - B o i l 10 minutes 4  Filter Add 3-5 c.c. HC1 to f i l t r a t e Gas with HgS gas etc. Proceed as i n Cobalt assay of ores.  See A .  COPPER Wash copper precipitate from cobalt assay into beaker using as l i t t l e water as possible. Add 5-10.. c.c. HN0  : 3  Add 3-5 c.c. Bromine water Evaporate mixture down to a volume of 3-4 c.c. ^ Add 25 c.c. H 0. 2  Add NH^OH u n t i l just neutral B o i l o f f excess HB^OH Add 1 c.c. HAc Add 1 gm (approx.) KI T i t r a t e with standard sodium theosulphate solution.  19. SULPHIDE SULPHUR (S-S) Weigh out | t o 1 gm of ore or calcine Add 5-10 c.c. HC1 - digest u n t i l oxides i n solution Add 5-5 c.c. n i t r i c chlorate mixture, evaporate to dryness and hake. Add 3-5 c.c. HC1 - evaporate t o dryness and bake. Add 3-5 c.c. HC1 Add 25-50 c.c. HgO F i l t e r and wash precipitate w e l l . -  &  Dilute f i l t r a t e to 300 or 400 c.c. - b o i l .  Add s u f f i c i e n t b o i l i n g BaClg to precipitate a l l the sulphur. Allow to set on warm plate.  F i l t e r and wash precipitate  3 or 4 times with hot 5 % HC1 solution and f i n a l l y 2 or 3 times with hot water. Ignite - Cool - weigh as BaSO^ Weight BaS0 x 0.1313 = weight of sulphur 4  SULPHATE SULPHUR (SO^-S) Weigh out 1-2 gms c a l c i n e Add 50-100 c.c. HgO - b o i l , f i l t e r and wash p r e c i p i t a t e well. Proceed as i n Sulphide Sulphur.  See ft .  IRON Weigh out \ to -|- gm of calcine or ore. Add 5-10 c.c. HC1 - digest u n t i l oxides i n solution. Add 3-5 c.c. n i t r i c chlorate mixture, take to dryness and bake. Add 3-5 c.c. HC1, take to dryness and bake. Add 15-20, c.c. HOI and heat. A  Add Stannous chloride solution drop by drop u n t i l a l l iron reduced and one drop i n excess.  Dilute t o 400 c.c. volume.  Add 10-15 c.c. Mercuric Chloride solution A i d 10 c.c. T i t r a t i n g solution  %  T i t r a t e with standard permanganate solution. & T i t r a t i n g solution consists of: 80 gms MnSO^ 165 c.c. H P 0 3  4  160 c.c. H^SO, 2 4 850 c.c. HgO WATER SOLUBLE OR AC ID''SOLUBLE IRON (W.S. Te or A.S. Fe) Weigh out 5 gms calcine Add 100 c.c. water Add 1 c.c. H S 0 g  4  (only f o r A.S. Fe)  B o i l f o r 10 minutes - F i l t e r Evaporate t o almost dryness Add 10-15 c.c. HC1 Add Stannous chloride solution drop by drop Proceed as i n Iron assay.  See A .  ARSENIC Weigh out 4 gms calcine  gm ore)  Add 5-10 c.c. HC1 - digest u n t i l oxides i n solution Add 3-5 c.c. n i t r i c chlorate mixture - evaporate to dryness and bake Add 3-5 c.c. HC1 - evaporate to dryness and bake Add 3-5 c.c. HC1 and warm u n t i l dissolved. flask with the aid of HC1. hydrazine sulphate.  Add  Transfer to a pyrex  gm of NaBr and ^ gm  Connect f l a s k with a d i s t i l l a t i o n column.  Have a t h i s t l e tube entering into, and continuing to the bottom of, the f l a s k ; through which 25-50 c.c. of HC1 may now be added. D i s t i l l - catching d i s t i l l a t e i n a 250 c.c. beaker 1/3 f u l l of cold water with t i p of condenser just below surface of water. When volume i n the f l a s k has been evaporated down to about 20 c.c. add 25 c.c. more HC1 and continue d i s t i l l a t i o n u n t i l volume i n f l a s k i s again about 20'c.c. into beaker.  Wash out condenser  Transfer contents of beaker to a 500 c.c. f l a s k .  Add a few drops of methyl orange Add NHjOH u n t i l just alkaline Add HC1 u n t i l just acid - cool completely Add 5-10 gms NaHC0  3  Add 10 c.c. starch indicator solution. T i t r a t e t o standard color end point with standard iodine solution.  T E S T S  TEST No. 1 150 gms cone, were added to an excess of strong b o i l i n g sulphuric acid to convert everything to sulphates. was f i l t e r e d hot.  The mixture  The p r e c i p i t a t e was roasted at 600 C. t o 650 C.  u n t i l a l l action seemed complete.  The resulting calcine weighed  97 gms. Go i n calcine • — —  ———  «  0.5  %  Co i n water leach residue  =  0.11 %  Result: 78 fo Cobalt, water soluble.  TEST No. 2 90 gms cone, were added to b o i l i n g HgS0 l e f t over from 4  Test No. 1 (The hot acid from Test No. 1 was cooled and the r e sulting p r e c i p i t a t e of AsgOg f i l t e r e d off.) f i l t e r e d hot.  The mixture was  The p r e c i p i t a t e was roasted at 650 C. t o y i e l d  104 gms c a l c i n e . —  -  0.76 fo  Co i n water leach residue — —  -  0.082 fo  Total Co (Gal.-)  Result: 89 % Cobalt, water soluble.  TEST No. 5 2000 gms cone, were added to s u f f i c i e n t b o i l i n g strong HgS0 to convert everything into sulphates. 4  filtered.  The hot mixture was  The residue was s p l i t into three parts, each part roasted  separately u n t i l a l l action seemed complete; as follows:  CALCINE * -  1  2  700 C.  665 0. fo  0.30 % (Cal)  0.22  fo  0.18  fo  fo  0.24  fo  0.19  fo  0.24  fo  0.09  fo  0.11  fo  43  fo  73  f  %  Co  0.15  1o  A.S. Co  0.20  W.S.  •  Co i n t a i l s —•-  —  •  — —  665 C.  0.33  0.46  Total Co —•  3  —  63  0  A 200 gms portion of No. 1 calcine was mixed with 80 gms  fo  salt and  given a c h l o r i d i z i n g roast. Total Co — W.S.  0.55 fo  —  Go —  A.S. Co Co i n t a i l s  — — •  -»  0.24  fo  0.30  fo  0.26 fo  Result: 54 fo Cobalt, acid soluble.  2:  TEST No. 4  1350 gms cone, were added to an excess of strong b o i l i n g HgSO^ to convert everything into sulphates. f i l t e r e d hot.  A 52 gm sample was cut from calcine and  The balance was mixed with an additional 25 gms of  s a l t and given a further c h l o r i d i z i n g roast to y i e l d 405 calcine B.  was  470 gms of the p r e c i p i t a t e plus 25 gms s a l t (NaCl)  were roasted at 650 C. called A.  The mixture  gms  CALCINE* i Total Co  A — — —  _  W. S. Co Total Fe W.S. Fe' •  Total Cu  f>  0.56  fo  —  0.7G  fo  0.63  fo  fo  27.2  fo  5.1  fo  4.1  fo  3.5  f  3.5  fo  0.48  fo  0.48  fo  3.5  fo —  3.4  fo  • >—  G.60  — 22.3 —  Insols  B  —-  Total As —  0  93 f  Cobalt recovery  .  0  -  9 3 fo  —  TEST No. 5 1800 gms cone, were added to a large excess of b o i l i n g strong HgS0 to convert everything into sulphates.  The hot mixture was  4  f i l t e r e d and the p r e c i p i t a t e assayed as follows: Co Cu  —  .34  fo  As  .36  fo  S - S — 2 . 0 S0 -S ~ — —  Fe —  24.1  fo  W.S. Fe  20.4  fo  :  4  0.3  fo fo  22.0 fo  No further work was done on t h i s t e s t . TEST No. 6 416 gms cone, were given a preliminary roast i n a tray at an i n i t i a l temp, of 550 C. and f i n a l temp, of 850 C. and yielded 250 gms calcine.  The 250 gms plus 30 gms of s a l t plus 12 gms  p y r i t e were roasted f o r two hours at 600 G. Result: Trace Cobalt, water soluble.  F i n a l weight = 290 gms  TEST No.. 7  * i  Some sulphated concentrate from Test No. 5 was roasted with. 5 fo carbon and again with 5 % carbon at 650 C. I t was then given a chloridizing roast with 3 fo s a l t at 650 0. Results 75 fo Cobalt, water soluble.  TEST No. 8 100 gms of cone, were given a preliminary roast at an i n i t i a l temp, of 550 C. and f i n a l temp, of 822 C. to y i e l d 63 gms calcine. 50 gms of t h i s calcine plus 25 c.c. strong HgSO^ plus 1 gm carbon plus 1 gm salt roasted at 650 C. Result: 80 % Cobalt, water soluble.  TEST No. 9 2000 gms cone, were given a preliminary roast at an i n i t i a l temp, of 550 C. and f i n a l temp, of 800 C. and yielded 1190 gms calcine (9A). Result: Co(Cal.) —  —  1.48 fo  TEST No. 9B 250 gms 9A plus 30 gms s a l t plus 12 gms p y r i t e roasted at 625 C. and yielded 290 gms calcine (9B). Result: Trace Cobalt, water soluble.  TEST No. 96.-' ) 100 gms 9A plus 5 gms plus 2 gms carbon plus 50 c.c. strong HgS0 roasted at 650 C. and yielded 124 gms calcine 9C.. 4  Result: 90 fo Cobalt, water soluble.  TEST No. 9D 100 gms 9A. plus 5 gms s a l t plus 2 gms carbon roasted at 650 C. Calcine cooled, screened, mixed with 50 c.c. strong HgS0^_ and r e roasted at 625 C. Result: 93 fo Cobalt, water soluble. TEST No. 9E 100 gms 9A plus 5 gms s a l t plus 5 gms carbon plus 50 c.c. HgSO^ roasted f o r 2-g- hours at 625 C  to y i e l d 127 gms calcine 9E.  Result:. 90 fo Cobalt, water soluble,  TEST;No, 9F 100 gms 9A plus 5 gms salt plus 25 c.c. HgSO^ plus 2 gms 0, roasted f o r 2 hours at 640 G. t o y i e l d 109 gms Calcine 9F. Result:• 62 f> Cobalt, water soluble.  TEST No. 9G1 100 gms Calcine 9A plus 2 gms carbon plus 50 c.c. HgS0 , roasted 4  for 6 minutes at 530 C. t o y i e l d 148 gms. Total Co  1.15 fo  Total Fe  TIT.S. Co — —  1.06 f  vr.s. Fe  Result: .92 fo Cobalt, water soluble.  32 fo 6.7$  TEST No. 9G2* i 140 gms 9G1 plus 5 gms s a l t , roasted f o r 15 minutes at 630 C. to y i e l d 140.5 gms calcine. Total Go  •  W.S. Go —  1.15  fo  Total Ee  1.15  fo  W.S. Fe —  33 fo ~  5.5%  Result: 100 fo Cobalt, water soluble.  TEST No. 955 130 gms 9G2, roasted at 640-650 C. to y i e l d 92 gms calcine 9G3, Total Co  •  n  1.46 47.7  fo  W.S. Co  f  A  a  i.  As  1.3  fo  "  Cu — — —  0.69  fo  #  s  .  C  WiSt.Te  o  0.99 fo  — — _  —  1  #  3  1  f  0  ——-Tr.  Result: 67 fo Cobalt, water soluble, 90 fo Cobalt, acid soluble.  TEST No; 10 1000 gms cone, were given a preliminary roast at an i n i t i a l temp, of 550 C. and f i n a l temp, of 625 C. to y i e l d 616 gms calcine 104. Total Co(Gal.) tr  •  1.36 <fo 51.4  fo  TEST No. 10B '  i  100 gms 10A plus 50 c.c. HgSO^ roasted at 625 C. Total. Oo(Cal.) — • "  Fe  —  "  Cu  —-  A.S.  Cu — .  fo  W.S. Go.  fo  A.S. Co  • 0.73  fo  1.02  fo  W.S. Cu  0.28  fo  0.40  fo  1.32 49.8  •  0.65 fo  Result: 50 fo Cobalt, water or acid soluble.  TEST No. IOC 100 gms of 10A plus 50 c.c. H S 0 g  4  plus 5 gms s a l t , roasted f o r  1^ hours at 625 C. Total Co(Cal.) - ~ n W.S,  F  43,1  e  Co  •  fo  1.09  •  0.25  f  A.S. Co — — W.S. Cu  0  fo'  A.S. Cu  0.66  7o  0.10 ; 0.40  1  lo  'lo  Results: 23 fo Cobalt, water soluble. 60 fo Cobalt, acid soluble.  TEST No. 10D 100 gms 10A plus 10 c.c. H S 0 plus 25 c.c. HgO, roasted at 650 C. g  4  Total Co(Cal.) — • »r  W.S.  Fe Co  1.34 fo  • 50.7 —  0.04  Result: 27 fo Cobalt, acid soluble.  A.S. Co  0.37 fo  fo  W.S. Cu — —  0.02  fo  fo  A.S. Cu  0.31  fo  TEST No. 10E ' 100 gms of 10A plus 40 c.c. HgSO^, roasted at 650 C. Total Go (Gal.) « «  W.S.  1.08  Fe A  40.8 .  s  Cu —  4  —  >  7  0.48  %  W.S. Co ---~ 0.82 fo  fo  A.S. Co  % fo  ¥  >  s  #  F  e  _  A.S. Cu  fo  0.86 6  e  6  o7  0.56  0  fo  Results: 76 fo Cobalt, water soluble. 80 fo Cobalt, acid soluble.  TEST No. 10F 100 gms of 10A plus 40 c.c. strong HgSO^ were mixed and allowed to react at room temperature u n t i l they formed a hard cake. 0.75 fo  Total Co(Cal.) --n  Fe  —  W.S. Go  28.3  •--—  0.56  fo fo  Result: 75 f> Cobalt, water soluble.  TEST No. IPG50 gms 10A plus 25 c.c. H S 0 plus 1 gm of carbon plus 1 gm of 2  4  s a l t , roasted at 650 C.  Result:  «  j  "  As  e  •  —  0.91  %  W.S. Co  42.8  fo  A.S. Co ( ? ) - 0.81  3.0  fo  Fe  4.0  fo  0.61  fo  W.S. Cu — ~  0.49  fo  1.13  Total Co(Cal.)  80 f> Cobalt, water soluble.  fo  TEST No. H A ' > 1000 gms cone, were given a preliminary roast at V50 0. to y i e l d 600 gms of HA.  TEST No. 11B 100 gms 11A plus 10 gms carbon plus 10 gms salt plus 10 gms pyrite, roasted at 700 C., cooled and 50 c.c. H S 0 g  4  added and further  roasted at 725 C. to y i e l d 120 gms. Result: 90 fo Cobalt, water soluble.  TEST No. 12 1000 gms of cone, were given a preliminary roast at 750 C.-820 0. for one hour.  Weight of calcine 565 gms. Total Ee Total As  54.8 fo ' . S - S 0.64 fo  S0 - S — 4  —  0.86 fo 1.08 fo  TEST No. 15 400 gms calcine from test 12 plus 8 gms carbon plus 200 c.c. H SO , roasted at 600 C~. f o r 10 minutes.  Sulphates weighed 595 gms.  Sulphates ground through 20 mesh plus 20 gms s a l t , roasted at 640 0. f o r i f hours to y i e l d 557 gms c a l c i n e . Result:  80 fo Cobalt, water soluble.  TEST Mo. 14 " 2000 gms of cone, were given a preliminary roast at i n i t i a l temp, of 550 C. and f i n a l temp, of 800 C. to y i e l d 1155 gms calcine 14A. Total Co n  F  "  1.50 _  e  54.9  As ----- —  «  C  2.64 1.40  u  fo fo  f>  0.72 fo  S0 -S — 4  S  - S  —  0.25  Au(Cal.) — —  fo  1.83 oz/ton  f>  TEST No. 14B 100 gms 14A plus 2 gms carbon plus 40 c.c. H SO., roasted at 550 C. for 15 minutes.  Weight of calcine 150 gms.  Total Co n  Fe  n  As ~  n  so 4  C  S  Sr-S —  fo  W.S. Co  —  0.98  fo  fo  A.S. Go  —  1.03  %  1.33  fo  W.S. Fe  .  7.4  fo  0.69  ff!  A.S. Fe  . 13.2  12.40  fo  W.S. Cu  0.62  fo  0.2  fo  A.S. Cu  0.65  fo  1.06 • •—  u  _.  _ „  37.2  Result: 87 f> Cobalt, water soluble. 89 fo Cobalt, acid soluble.  TEST No. 140 100 gms 14B plus 5 gms s a l t , roasted at 650 C. f o r 15 minutes. Weight of calcine = 96 gms.  '#  Total Co «  Fe  ir  .  Cu  ,_  •  so -s  :—.  4  s-s  %  W.S. Co  0.98  %  %  A.S. Co  1.03  fo  1.33  fo  W.S. Fe  7.4  0.69  fo  A.S. Fe  — —  12.40  fo  W.S.  Cu  —  0.60  fo  A.S. Cu  1.06  ~  37.2  .  13.2  fo fo  0.62  fo  0.65  fo  Results: 92 f> Cobalt, water soluble. 97 fo Cobalt, acid soluble.  TEST No. 14D 50 gms of 14 C , roasted at 680 C. f o r 1^ hours to y i e l d 36 gms calcine.  1.45  Total Co w.  Fe —  tr  As  «  Cu  so 4  s-s  S  •—  o;.84  W.S.  foi  A.S. Co  1.74  fo  W.S. Fe  Trace  0.92  fo  A.S. Fe  0.80  fo  4.0  fo  W.S.  Cu  0.45  fo  0.1  fo  A.S. Cu  0.80  49.5  --———  Co  fo  Result: 58 fo Cobalt, water or acid soluble.  0.83 ;*  TEST No." 14E-* ' 100 gms 14A plus 2 gms carbon plus 7^- gms s a l t plus 40 c.c. H so , roasted at 650 G. f o r 15 minutes to y i e l d 149 gms sulphates. 2  4  Total Co it  Fe  ti  As  «  Gu  so 4  W.S. Co  1.01  $  fo  A.S. Co  1.01  fo  1.26  fo  W.S. Fe  8.8  fo  0.67  fo  A..s.;  13.1  fo  12.70  fo  W.S. Cu  $  A.S. Cu —  36.6  —  S  s-s -  fo  1.12  ___  0,40  Fe •  0.64  fo  0.66  fo  Result: 90$ Cobalt, water and acid soluble.  TEST No. 14F 100 gms of 14E, roasted for !§• hours at 688 C. to y i e l d 73 gms. Total Co  1.43  fo  W.S. Co -  • •  0.88  fo  fo  A.S. Co  •  1.23  fo  n  Fe  tt  As  1.68  fo  W*S. Fe  Trace  n  Cu  0.94  fo  "A.S. Fe  0.7  fo  _„_____._  4.1  fo  W.S. Cu  0.51  fo  A.S. Cu  0.91  fo  so 4  S  49.0  NIL Results: 61 f> Cobalt, water soluble. 8B fo Cobalt, acid soluble.  TEST No. 14G > . 600 gms 14A plus 12 gms carbon plus 240 c.c. H SO , roasted at 550 C. for 15 minutes. Weight of sulphates = 895 Total Co (Cal.) —  1.02  fo  A.S.  0.81  fo  Co  Au  — . — —  Au (Cal.) - — — —  gms.  1.19  oz./ton  1.23  oz./ton  Results: 80 fo Cobalt, acid soluble. 37 fo Gold l o s s .  TEST No.  14H  823 gms of 14G plus 41 gms minutes.  s a l t , roasted at 650 C. f o r 15  Weight of calcine = 837  gms.  Total Co (Cal.) A.S.  Co  •  Au (Cal.) 4u  1.0 • 0.86  -•  •  —  —•—•  % fo  1.21  oz./ton  1.08  oz./ton  Result: 86 fo Cobalt water soluble. 10 fo Gold l o s s TEST No. 14 I 77 3 gms of 14H, roasted at 680 G. for i f hours to y i e l d 660 1.18 fo  Total Co (Cal.) A.S. Co  — —  Au (Cal.) Au ---  1.02 —  —  Result: 85 fo Cobalt water soluble, 14 fo Gold Loss.  f>  1.41  oz./ton  1.20  oz./ton  gms.  35,  TEST No-. 14J 596 gms 141, roasted f o r 2 hours at 680 C. to y i e l d 530 Total Co.(Est.) Total Ee  1.40  —  —  Total Cu — • — W.S.  Cu — •  A.S.  Cu  —-•  — — - — —  Au (Gal.) — - — ~ —  fo  W.S.  fo  A.S. Go  0.90  fo  W.S.  Ee  — Trace  0.65  fo  A.S. Ee  1.15  0,69  fo  Au —  1.37 oz/ton  47.5  1.59  Co  gms.  -—  1.21  fo  1,26  fo  fo  oz./ton  Result: 86 fo Cobalt, water soluble. 14 fo Gold l o s s ,  TEST No,  14K  200 gms of 14J were water leached. cut  Approximately 10 gm sample  from water leach t a i l s , Au  TEST No.  ——•—»-——-  1.60  oz./ton  ML  Water leach t a i l s from 14K were cyanided i n approx. 0,05 percent cyanide solution with protective a l k a l i n i t y kept at 0.04 fo CaO. of agitation was 43 hours.  Cyanide t a i l s weighed 142  Au =--<p«25 oz./ton Result: 84 fo Gold recovery.  gms.  Period  T E S T m.  14M  100 gms 14A. plus 2 gms carbon plus 40 c.c. H SO , roasted at 2 4 550 0. f o r 15 minutes.  Cooled, screened and further roasted f o r  !•§• hours at 680 G. and yielded 100 gms. Total Co (Cal.) W.S.  Fe  A.S.  Fe  —  1.50  fo  W . S . Co — —  1.15  0.10  f>  A.S. Co  1.26 fo  2.9  fo  $  Result: 76 fo Cobalt, water soluble. 84 fo Cobalt, acid soluble. TEST No. 14N 40 gms calcine 14M plus 3 gms s a l t , roasted at 620 C. f o r 15 minutes t o y i e l d 42 gms c a l c i n e . Total Co(Cal.) W.S.  Fe  A.S.  Fe  1.45  —  fo  Trace 1.70  . W.S. Co — — A.S. Co  0.17  fo  1.19  fo  fo  Result: 12 fo Cobalt, water soluble. 85 fo Cobalt, acid soluble. TEST No. 140 40 gms 14M plus 3^gms s a l t plus 2 gms primary sulphates 14B, roasted at 620 C. f o r 15 minutes to y i e l d 44 gms. Total Co (Cal.)  Result:  W.S.  Fe  A.S.  Fe  1.41  fo  Trace —  1.4  25 fo Cobalt, water soluble. 85 fo Cobalt, acid soluble.  W.S. Co A.S. Co  fo  • 0.33 fo :  1.17 fo  TEST No. 16 200G gms cone, roasted at 750 C. t o y i e l d 1202 gms calcine 16A. Total Co (Cal..) 11  As  n  S  1.46 fo  — —--—--• —  4.7  fo  1.3  fo  TEST No. 16B 600 gms 16A plus 300 c.c. H S0 , roasted f o r 15 minutes at 550 C. g  to y i e l d 900 gms of sulphates.  4  These sulphates plus 90 gms salt were  ground - 28 mesh and roasted at 600 C. f o r 25 minutes.  F i n a l weight  equal 935 gms. Total Co •  fo  W.S. Co  0.79  fo  %  A.S. Co  0.79  fo  0.70  fo  W.S.  6.7  fo  A.S.  12.9  fo  0.96  t»  •Fe —  —  n  Cu  —  ;  33.6  W.S.  Cu  0.64  fo  A.S.  Cu  0.65  fo  Result: 82 % Cobalt, water or acid  j  e  soluble.  TEST No. 160 875 gms 16B, roasted at 640 C. f o r two hours to y i e l d 827 calcine. Total Co  1.00 35.4  fo  W.S. Co - - —  0.90  fo  A.S. Co  0.90  tt  y  «  cu  •  0.66  fo  W.S. Fe  • 4.7  W.S.  Cu—  •  0.80  f,  A.S. Fe  10.9  A.S.  Cu  •  0.63  e  f,  Result: 90 f> Cobalt, acid or water soluble.  TEST No. 16D 250 gms of 160 leached with 1000 c.c. of 3,50 fo HgS0 for one hour at 80 G.  4  solution  Residue weighed 111 gms.  Total Co  1.00  fo  A.S.  0.72  fo  Co  Result: 72 fo Gob a l t , acid  soluble.  TEST No. 16E 250 gms 160 ground i n a pebble m i l l f o r -jr hour at 50 fo s o l i d s . Pulp acid leached with 1000 c.c. of 3.5 fo solution H^SO^ at 76 G.  f o r l-g- hours  Residue weighed 115 gms. Total Co — — A.S.  Co—  fo  » ~ 1 . 0 0 — —  0.72  fo  Result: 72 fa Cobalt, acid  soluble.  TEST No. 16F 227 gms 160 roasted for four hours at 640 C. to y i e l d 185 gms calcine.  1.20  Total Co »»  Fe —  fo  W.S.  fo  A.S, Co  0.79  fo  W.S.  Ee  — — —  42.5  Go  — —  1.03  fo  1.04  fo  0.10  fo  1.9  fo  M  Cu  »r  A.s  2.1  fo  A.S.. Ee  W.S.  Cu  0.64  fo  SO -S — 4  6.7  fo  A.S.  Cu — - - -  0.68  fo  s-s  0.1  fo  —-—  Result: 86 fo Cobalt, water or acid  soluble.  TEST No. 16G125 gms 16F leached with 600 c.c. of 3.5 fo H S 0 g  one hour at 84 0.  4  solution f o r  Residue weighed 90 gms.  Total Co A.S.  Co  —•  1.20 fo  :  — —  0.81  f>  Result: 67 fo Cobalt, water soluble. TEST No. 16H 500 gms calcine 16A plus 10 gms carbon plus 225 c.c. H SO roasted 2 4 at 550 0. f o r 15 minutes.  Cooled, ground - 100 mesh plus 57-|- gms  s a l t , reroasted f o r f i v e hours at 630 C. 1.09 fo  Total Co " n  A.S. Co  0.94  fo  fo  W.S. Fe — —  4.1  fo  0.61  fo  A.S. Fe  11.8  fo  0.65  fo  S-S  o.8  fo  Fe Cu  37.3 0.70  W.S.  Cu  A.S.  Cu  S0 -S — - — — 4  F i n a l weight - 670 gms. W.S. Co 0.93 fo  11.3  f>  ~  ,  fo  Result: 85 fo Cobalt, acid or water soluble. TEST No. 16J 348 gms 16H, reroasted at 680 C. t o y i e l d 282 gms calcine. 1.28  Total Co  W.S. Co  1.04  fo  fo  A.S.  1.04  fo  n  Fe  •  «i  Cu  — —  0.84  fo  W.S. Fe  2.9  fo ?  W.S.  Cu  -  0.68  fo  A.S. Fe  0.20  fo '  0.60  fo  A.S.. Cu Result:  fo  45.6  81 fo Cobalt, water or acid soluble.  TEST No. 17A 2000 gms cone., roasted at 850 C. f o r one hour.  Cooled, somewhat,  added 30 gms of carbon and reroasted at 850 C. f o r 15 minutes. Cooled added 57 gms s a l t and 750 c.c. H SO and roasted f o r s i x hours at 2 4 680 C. F i n a l weight = 1345 gms. 1.31 fo  Total Co(Oal.).  TEST No. 17B 500 gms 17A, reroasted at 680 C. f o r two hours to y i e l d 450 gms calcine 17B.  250 gms 17B leached f o r one hour at 80C. Total Co (Cal.) "  CU  W.S.  Co  W.S.  Cu  W.S.  Ee  —  —  •  - —  1.45 fo 0.93  fo  1.30  fo  0.76  fo  0.07  fo  Result:' 90 fo Cobalt, water soluble. TEST No. 18A 1000 gms cone, roasted at 500 t o 550 f o r three hours. Then temp, raised t o 650 C. f o r minutes.  hour and f i n a l l y to 700 C. f o r 15  F i n a l weight = 606 gms. Total Co(Cal.) tt S0 -S A  A  — — —  s  — —  —  1.45 5.6'  —  0.8  fo fo fo  S-S — W.S. As — A.S.  As —  0.1 fo 0.08  fo  1.42$  TEST No-. 18B 100 gms 18A plus 6 gms salt plus 50 c.c. H SO roasted f o r 2 4 20 minutes at 550 C. 10 minutes at 550 C. and f i n a l l y 4 hours at 690 - 700 0.  F i n a l weight = 108 gms. 1.44 fo  Total Co W.S.  Co —  — — -  0.22  fo  Result:  15 f> Cobalt, water soluble.  TEST No. 19A 1000 gms cone, roasted at (800-825 C.) f o r one hour and yielded 570 gms calcine 19A. Total Co(Cal.) «  As —  S0 _s — — —  1.54  fo  S-S  2.43 fo  1.06  fo  W.S. A s —  0.05  1.0 .fo  A  fo  A.S. A s — 0.60 fo  TEST No. 19B 100 gms of 19A were treated exactly the same and at the same time as 100 gms 18A were treated i n Test No. 18B. F i n a l weight = 112 gms. Total Co(Cal.) W.S. Co —  —  1.37 fo ' 1.21 fo.  Result: 88 fo Cobalt, water soluble. TEST No. 19C 100 gms 19A plus 45 c.c. HC1, roasted gently f o r one hour and finished at 350 C. f o r one hour. Total Co(Cal.) —  Result:  F i n a l weight = 100 gms. >-  W.S. Co — „ • 42 fo Cobalt, water soluDle.  1.54 fo 0.65  fo  TEST No. 20A 2000 gms cone.j roasted at 800 C. f o r -ig- hour and at 830 0. f o r hours.  Weight of calcine - 1135 gms. Total Co(Cal.) — «  As —  1.55 fo  — ~ —  Ferrous Fe — r - — - - - - : —  0.56  fo  2.5  fo  TEST No. 2QB 900 gms calcine 20A, roasted at 830 C. f o r 20 minutes and at 850 C. f o r 10 minutes.  F i n a l weight = 888 gms.  Total Co(Gal.) — «  As  n  s ------  1.57 fo  —--  — —  0.58  fo  1.18 fo  •  0.20 fo  Ferrous Fe  TEST No. 200 300 gms of calcine 20B ground dry f o r 15 minutes plus 150 c.c. H S0. p5.us 1 5 gms s a l t plus 10 gms carbon, roasted at 550 C. f o r o  10 minutes.  E i n a l weight — 480 gms. Total Co.(Est.) n  • —  1.36 49.5  fo  W.S. Co  1.26  •fo  A.S. Co  1.23  "  Cu - — —  0.98  fo  W.S. Fe  0.15  »  as  0.43  fo  A.S. Fe  1.14  0.90  fo  A.S. Cu - — •  0,95  U.S.  —  Cu —  Result: 91 f> Cobalt, acid or water soluble.  TEST No. 20D 300 gms 20B ground dry f o r 15 minutes plus 150 c.c. H„S0,, roasted 2 4 at 550 0. and f i n a l l y at 700 C. f o r l i hours. F i n a l weight = 506 gms. Total Co  «  C u  «  j  '».  As  ____  1.55  fo  W.S. Co  1.10  fo  o.98  fo  W.S. Cu  0.59  fo  W.S. Fe — —  0.03  55.6  e  0.45  fo  fo  fo  Result: 82 fo Cobalt, water soluble. TEST No. 2IA  -  5000 gms cone, roasted at 750 C. on f l o o r of furnace f o r l i hours t o y i e l d 1685 gms. Total Co (Cal.) "  As  «•  s  •  — — •  1.57  fo  0.56  f>  2.06  fo  TEST No. 21B 100 gms calcine 21A plus 5 gms p y r i t e plus 15 c.c. HC1 plus 15 c.c. H 0, roasted at 350 C. f o r f hour. o  Weight calcine =10.4  Total Co(Gal.)  1.51 fo  W.S.  1.11  Co  Result: '74 fo Cobalt, water soluble.  fo  gms.  TEST .No.. 210. 52 gms of calcine 21B heated i n beaker at 350 0. f o r one hour to y i e l d 52 gms. Total Go (Gal.) W.S..  Go  1.51 fo  —  ••  .  .  1.05  fo  Result: 70 fo Cobalt, water soluble. TEST No. 2H) 100 gms calcine 21A plus 5 gms pyrite plus 15 gms s a l t , roasted at 350 C. f o r 1-gr hours. Weight of calcine •» 119 gms. Total Co (Cel.) •  1.27  fo  W.S.  0.94  f>  Co ---~  •  Result: 74 fo Cobalt, water soluble. TEST No. 21L 400 gms 21A, roasted f o r one hour to y i e l d 381 gms. Total Co(Cal.) »  As - —  n  S  ~ .  1,65  fo  0.40  fo  1,13  fo  TEST No. 21M 100 gms 21L plus 10 gms pyrite plus 15 c.c. HgO plus 15 c.c. l i d , roasted at 400 C. f o r one hour.  E i n a l weight = 114 gms.  Total Co(Cali)  1.45 fo  W.S.  0.85  Co  Result: 58 fo Cobalt, water soluble.  fo  TEST 21P  *  >  100 gms 21A, ground dry and leached f o r one hour with 5 fo sulphuric acid solution. 1.57 fo  Total Co(Cal.) - - — • A.S.  Go  —  —  i,o  ~  f>  Result: 64 fo Cobalt, acid soluble.  TEST Mo. 22A  -  '  4000 gms cone, roasted at 750 C. f o r one hour and f i v e minutes on furnace f l o o r with pyrometer i n the calcine.  F i n a l weight  =  2284  1.54 fo  Total Co (Cal.)  TEST No. 22B 500 gms 22A ground dry plus 50 gms salt, roasted f o r one hour at 590-600 0. to y i e l d 538 gms calcine. Total Co(Cal.) — — n  W.S.  As Co  •  1.43  fo  A.S. Co — -  0.25 fo  0.41  fo  W.S. Cu — —  0,48  fo  0.15  fo  A.S. Cu  0.80  fo  Result: 10 fo Cobalt, water soluble. 17 fo Cobalt, acid soluble.  46.  TEST No. 220 100 gms 224 plus 40 c.c. solution roasted at 450-500 0. f o r 2 hours.  E i n a l Weight = 110 gms (solution:55 c.c. water plus 6 c.c.  HgSO^ plus 5 gms s a l t ) . Total Co(Cal.) — —  1.40  fo  W.S. Co  1.00 fo  W.S.  2.39  fo  A.S. Co  0.77  %  A.S. Cu — -  0.62 fo  Ee  t -  Total Ee  49.0  fo  Result: 72 f> Cobalt, water soluble. TEST No. 22G s  100 gms 22A plus 40 c.c. of solution and evaporate to dryness at 350 C. plus 20 c.c. more solution and roast f o r 2 hours at 350 C. (solution: 4 c.c. HC1 plus 2 c.c. H SO plus 52 c.c. H O to last 2 4 <3 18 c.c. portion added 2 c.c. more.H^SO^.) E i n a l weight • 104 gms. Total Co(Cal.) Total Ee  •  1.48 fo  A.S. C o — —  0.92 fo  fo  A.S. Ee — —  4.3  52.0  Result: 62 fo Cobalt, acid soluble. TEST No. 22N 100 gms 22A plus 50 c.c. HC1, roasted f o r 2 hours. • 1.54 fo  Total Co(Cal.)  Result:  W.S.  Co  A.S.  Co —  „  _  —  •—  »  _  _  i.oi  1.00  fo  fo  65 fo Cobalt, water or acid soluble.  fo  47  TEST No. 23  200 gms Calcine 20 C. water leached  I Filter Ppt. to waste F i l t r a t e made up to 1000 c.c.  I 200 c.c. portion plus 2 gms CaCO { : Filter  Heat ' Stir  ~*  3  Ppt .A—  F i l t r a t e - 5 c.c. 5 J H O plus 1 gm CaC0„ 2  Ppt.B—  2  Heat Stir  Filter F i l t r a t e made up to 300 c.c.  25 c.c. portionfor assay 275 c.c. F i l t r a t e - 1 gm CaCO^ — H e a t ,  J  Ppt.C-  Filter • • ' F i l t r a t e - 1 gm NaUOO- —  Ppt.D ^.  =  ' Ppt.F —  .. . —— Heat, s t i r  Filter F i l t r a t e - 1 gm Na_C0,, —  Ppt.E —  stir  • Heat, s t i r  Filter J i F i l t r a t e - I f gm Na COJ 2 3 Filter  \ Filtrate  Heat, s t i r  Product  Additions  Heads  Go 1.26  Ppt.A  2 gm CaGO  Ppt.B  3 1 gm CaGOg  ___  Fe  0.90  0.15  0.27  0.07?  0.39 1.25  Heads  Assays Cu  Ppt.C  1 gm CaCO^ o  Ppt.D  1 gm Na CO 2 3 1 gm Na CO 2 3  0.87  1.5 gm Na CO 2 3  Tr.  0.24 0.19  — —  Tr.  &  Ppt.E Ppt.F  0.37  Filtrate  Results: 98.5 fo Cobalt recoverable from leach solutions. 1 gm Na CO  w i l l ppt. 2.0 gms Cobalt.  49.  TEST No. 25B  zo  ' •  200 c.c. portion of leached ^treated s i m i l i a r to Test No. 23 with the exception of additions which are shown below. Co Additions Product 1.26  Heads 1 gm. CaCO 3 Sfe gm Ca00  Ppt .A "• B «  1  |  Assays Cu  Fe  0.90  0.15  0.06  0.48?  0.90  3  2 gm Na GO 2 3  0  1.26  Tr.  Filtrate  Result: 100 fo Cobalt recoverable from leach solution.  I l  C  TEST No. 250 :  '  -.  50 gms of calcine 17B were treated s i m i l a r l y to test No.25 with the exception of the additions which are shown below. Assays Cu Co Additions Product 1.30  Heads 3 gm CaC0  Ppt .A »  2 gm Na CO 2 3  B  Filtrate  Result:  3  1.26  Fe.  0.76  0.07  0.72  Tr.  0.08  Tr.  98 fo Cobalt recoverable from leach solution.  TEST No. 24A* j  .  100 gms calcine 22A plus 9 c.c. HC1 plus 30 c.c. HO,  roasted  at 450 f o r 1 hour t o y i e l d 100 gms calcine. Total Co(Cal.) n  ~  —  W.S.  Ee —  W.S.  00  fo  1.54  fo  54.0  .  •  ;  0,5  .  fo  1.11  fo  Result: 72 fo Cobalt, water soluble TEST No. 24B 50 gms of 24A plus 23 c.c. HgO plus 2 c.c. HC1, roasted at 350 C. t o y i e l d 50 gms, f i n a l c a l c i n e . Total Co(Cal.) —  1.54 fo  A.S.  1.07  A.S  Co  •  Fe —  •  fo  l«.'ll fo  Result: 69 fo Gobalt, acid soluble. TEST No. 240 100 gms calcine 22A plus 6  c.c. HC1 plus 2^ c.c. H S0 , roasted g  at 350 C. f o r -|- hour to y i e l d 104 gms calcine. 1.48. fo  Total Co(Cal.) W.S.  Co  —  Result: 68 fo Cobalt, water soluble.  1.01  f,  4  TEST No. 50A* ) 2000 gms cone.  8  roasted at 800 0. f o r 40 minutes to y i e l d  1207 gms calcine. Total Co(Cal.) «.  Ee  »  As —  n  s  1.45 fo  —  62.0 ——•  1.95  _  12.2  f, fo fo  TEST No. 50B 100 gms 30A plus 50 c.c. strong HC1 roasted at 350 0. f o r 1 hour.  E i n a l Weight - 105 gms. 1.43 fo  Total Co(Cal.) W.S.  Co —  — —  1,17  f,  Result: 82 fo Cobalt, water soluble.  TEST No. 50G 100 gms 30A plus 15 gms s a l t (added i n aqueous solution) roasted at 550-600 C. f o r 1-jj? hours. Total Co(Est.) W.S.  Co  —  :  Result: 74 fo Cobalt, water soluble.  1.27 fo 0.94  fo  52 ®  TEST NO. BI& " l 400 gms 30A roasted at 650 C. for •§• hour. Total Co (Cal.) W.S.  Co  W.S.  Cu  —  E i n a l weight = 380 gms.  1.55  fo  Totals  2.62 fo  0.31  fo  S0 -S —  1.05  0.18  fo  4  Result: 20 f> Cobalt, water soluble. TEST Mo. BIB 100 gms calcine 31A plus 30 c.c. HC1, dried slowly and roasted at &50 C. f o r -|- hour.  E i n a l weight  s  102 gms.  Total Co (Cal.) W.S.  Co  1.52 0.75  r  fo fo  Result: 50 fo Cobalt, water soluble. TEST Mo. 510 100 gms 31A plus 15 c.c. HgO plus 15 e.c. HOI roasted on hot plate at 350 0. f o r g- hour.  F i n a l weight = 101 gms.  Total Co(Cal.) — W.S.  Go  ~ — —  1.54 fo 0.64  fo  Result: 41 fo Cobalt, water soluble. TEST No. 51D Same as t e s t 31C except roasted i n furnace instead of on hot plate.  F i n a l weight - 101 gms. Total Co(Cal.) —  1.53 fo  W.S.  0.92  Co  Result: 60 fo of Cobalt, water soluble.  fo  %  TEST No. 52A • \ 110 gms calcine 30A, roasted at 600 C. f o r 6 minutes.  Final  weight = 105 gms. TEST No. 52B 90 gms of 32A plus 15 c.c. HC1 plus 15 c.c. H 0, roasted f o r one 2  hour at 4000.  F i n a l weight - 92 gms. Total Co (Cal.) — —  1.51  fo  W.S.  Co —  0.88  %  A.S.  Co  0.94  fo  — —  Brine S o l . Co  •  •  0.91 fo  Result: 60 fo Cobalt, water, or acid, or brine soluble. TEST No. 54A. 2000 gms c o n e , roasted at 750 C.  Roast stopped shortly after  arsenic flame died down. F i n a l weight = 1270 gms. Total Co  —  Totals•S0.-S — 4  •  1.39  fo  13.18  %  0.61  fo  TEST No. 54B 500 gms 34A roasted at 650 C. f o r 15 minutes to y i e l d 480 gms calcine 34B. TEST No. 34C 100 gms 34A plus 15 c.c. HC1 plus 15 c.c. HgO, roasted at 350 C. f o r one hour.  Results  F i n a l weight = 99 gms. Total Co(Cal.) — —  1.40  f°  W.S.  0.89  fo  Co  . , , , 53 f> Cobalt, water soluble.  TEST No. 54D 50 gms 34B plus 7.5 HOI plus 7.5 c.c. H O , roasted at 550 C. for 35 minutes.  E i n a l weight = 50 gms.  Total Co(Cal.)  1.44 fo  W.S.  0.77  Co —  fo  Result: 53 fo Cobalt, water soluble.  TEST No. 55A 2000 gms cone, roasted at 825 C f o r one hour and a further two hours at 750 C.  E i n a l weight = 1126 gms.  A.S. Co  ___..—_.>  Nil  TEST No. 37A 300 gms c o n e , roasted at 750 C on furnace f l o o r u n t i l arsenic flame died.  Approx. 30 minutes.  TEST No. 40A 2000 gms cone, roasted at 810 C f o r 35 minutes - removed and cooled away from open a i r . E i n a l weight = 1165 gms. Total Co(Cal.)  1.51  fo  S-S  Total As  0.56  fo  SO^-S ~  21.32 fo 0.18 fo  JEST No. 40B 200 gms 40A, roasted i n open tray at 450 C f o r 30 minutes. E i n a l weight - 190 gms. Total Co (Cal.) W.S.  — —  Co —  Result: 39 fo Cobalt, water soluble.  1.59 fo 0.62  fo  TEST No. 4QG , 100 gms of 40A, roasted i n p a r t i a l l y covered tray at 450 0. f o r one hour.  F i n a l weight = 97 gms. Total Co(Cal.) -•  1.56 fo  W.S.  0.88  Co —  -—•-—  fo  Result: 54 fo Cobalt, water soluble.  TEST No. 40D 100 gms 40A plus 5 c.c, H S 0 plus 10 c.c. H 0 g  4  g  dried at 250 C,  f o r one hour and roasted i n p a r t i a l l y covered t r a y at 450 C. f o r one hour.  F i n a l weight = 105 gms. Total Co(Cal.) W.S.  Co — • —  —  1.44  fo  0.94  fo  Result: 65 fo Cobalt, water soluble.  TEST No. 4QE  • .  90 gms 40D reroasted at 650 C. f o r 40 minutes i n open t r a y . F i n a l weight  =  87 gms. Total 0o(Cal.) — — —  1,51  fo  W.S.  1.11  f>  Co — ~ —  •  Result: 73 fo Cobalt, water soluble.  TEST.No. 40Fs 100 gms 40B reroasted at 625 C. f o r 40 minutes i n open tray. F i n a l weight - 98 gms. Total Go(Cal.) — —  1,62  fo  W.S.  0.82  %  Co  •  Result: 50 fo Cobalt, water soluble.  TEST No. 40G 100 gms 40A plus 15 c.c. H S 0 plus 5 gms HgO, roasted at 450 C. g  f o r l-k hours i n covered t r a y .  4  F i n a l weight = 115 gms.  Total Co(Cal.) — W.S.  —  Co  1.34  fo  0.60  fo  Result: 45 fo Cobalt, water soluble.  TEST No. 40H 100 gms 40A plus 15 gms s a l t , roasted at 450 C. f o r i f hours i n covered t r a y .  F i n a l weight = 122  Total Co (Cal.) •-  gms.  -—-  W.S. Co ———— Total S  :  •—  S0 -S — — — — 4  Result: 81 fo Cobalt, water soluble.  1.24  fo  1.00 fo 6.86 6.54  fo fo  TEST No. 401 • 100 gms 40A plus 40 gms pyrite roasted f o r 2 hours at 450 C. F i n a l weight - 110 gms. 1,37 fo  Total Co(0al.) — W.S.  Co — —  .  0.83  fo  Result: 60 fo Cobalt, water soluble.  TEST No. 40J 100 gms 40A plus 5 gms Na S0 , roasted at 450 0. f o r l | hours. g  4  F i n a l weight = 103 gms. 1.47 fo  Total Co (Cal.) W.S.  Co  —  0.95  fo  Result:-' 65 fo Cobalt, water soluble.  TEST No. 40K 50 gms of 40G-, reroasted at 625 0. f o r 40 minutes. weight = 43 gms. Total Co(Cal.) W.S.  Co  — — ••  1.12  fo  3.09 fo  S0 -S 4  S-S  1.56 fo  —  Result: 72 fo Cobalt, water soluble.  0.32  fo  Final  TEST No. 40L 50 gms of 401 reroasted at 625 C. f o r 40 minutes.  Einal  weight = 43 gms. Total Co (Cal.)  1.43  fo  SO^-S  1.21 fo  W.S.  0.86  fo  3-3  0.15  Co  fo  Result: 60 fo Cobaltj water soluble.  TEST No. 40M 50 gms 40J reroasted at 625 C. f o r 45 minutes.  Einal  weight = 48 gms. Total Co(Gal.)  1.52  fo  SO^-S  2.64 fo  W.S,  1.13  fo  S-S  0.30  Co  Result: 74 fo Cobalt, water soluble.  TEST No. 40N 50 gms 40H reroasted at 625 G. f o r 45 minutes, weight = 43 gms. 1.29  fo  • 1.16  fo  SO -S — ~ — 4  6.14  fo  s_s  0.00  fo  0.40  fo  Total Co(Cal.) — W.S.  Co — — — —  —  Total As  •  Result: 90 fo Cobalt, water soluble,  Einal  fo  59.  TEST No. '41A 2000 gms of cone, roasted i n the tray at 750 C. f o r 65 minutes. F i n a l weight = 1465 gms. S0 -S  0.06 fo  —  4  S-S-.—  21.04  fo  TEST No. 41B 100 gms 41A. plus 15 gms s a l t , roasted at 450 C. f o r one hour and 20 minutes.  F i n a l weight = 102 gms. Total Co(Cal.)  W.S. •• •  Go  — —  1.18  fo  SO -S  0.18  fo  S-S  —  5.57 fo 0.47  Result: 15 fo Cobalt, water soluble.  TEST No. 42A 2000 gms of c o n e , roasted at 775 0. f o r 55 minutes.  Final  weight = 1180 gms.  0.11 fo  so -s 4  •S-S  — — :  19.59  fo  TEST No. 42B 100 gms 42A plus 15 gms s a l t , roasted f o r l j hours at 450 C. F i n a l weight = 120 gms. Total Co(Cal.) — —  1.24  fo  SO^-S  6.00 fo  W.S.  0.91  fo  S-S —  0.32  Co  —  Result: 73 f> Cobalt, water soluble.  fo  fo  •60.  TEST No.'45A 2000 gms cone, roasted at 800 C. f o r 70 minutes.  Final  weight = 1155 gms.  SO^-s ~  0.11 .  S-S — —  17.09  fo  fo  TEST No. 45B 100 gms 43A plus 15 gms s a l t , roasted f o r 80 minutes at 450 C. F i n a l weight = 121 gms. Total Co (Cal.) — —  1.26  fo  S0 -S ~ —  5.90 fo  W.S.  0.91  fo  S-S •  0.25  Co  —  4  fo  Result: 72 fo Cobalt, water soluble.  TEST No. 444 2000 gms c o n e , roasted on furnace f l o o r at 825 0. f o r 30 minutes.  F i n a l weight = 1180 gms. S0 -S  —  4  0.12 fo 20.98 fo  S_S  TEST No. 44B 500 gms 44A, roasted at 450 C. f o r 80 minutes. Total Co (Est.)  1.29  fo  SO^-S  W.S.  0.88  fo  S-S  Co  Result: 68 fo Cobalt, water soluble.  ——  3.98  fo  —  0.17  fo  TEST No. 44CT 500 gms 44B plus 25 gms s a l t , roasted f o r 60 minutes at 450 0. and f o r a further 2 hours at 725 C. Total Co(Cal.) W.S.  Oo  1.25  fo  •— Trace  SO -S 4 S-S •  4.20 4> ' 0.27 fo  TEST No. 44D 500 gms 44ft. plus 25 gms s a l t , roasted i n muffle f o r 2 hours. ' F i n a l weight = 580 gms. Total Co (Cal.)  1.29  fo  SO^-S  W.S.  0.97  fo  S-S  Co  5.21 fo • 0.03  fo  Result: 75 fo Cobalt, water soluble.  TEST No. 44E 400 gms 44D, roasted at 600 C. f o r 50 minutes. Weight of calcine = 387 gms. Resulti 43 fo Cobalt, water soluble.  TEST No. 45ft. 4000 gms c o n e , roasted at 800 C. f o r 35 minutes. Weight of calcine = 2370 gms. TEST No. 45B 400 gms 45A plus 60 gms s a l t , roasted i n p a r t i a l l y covered tray f o r l£ hours at 350 C. and 1-| hours at 400 C. Weight of calcine = 524 gms. Result: 41 fo Cobalt, water soluble.  TEST No. 450 400 gms 45A plus 53 gms NagCOg, roasted i n p a r t i a l l y covered tray at 350 0. f o r 3 hours. Weight of calcine = 483 gms. Result: 18.5  fo Cobalt, water soluble.  51 fo Cobalt, acid soluble. TEST No. 45D 400 gms. 45A plus 71 gms Na S0 *7Hg0, roasted i n p a r t i a l l y g  4  covered tray f o r 3 hours at 350 0. Weight of calcine = 462 gms. Result: 24 fo Cobalt, water soluble. 46 fo Cobalt, acid soluble, TEST N6.45E 400 gms 45A, roasted i n p a r t i a l l y covered tray f o r Sg- hours -  at 550 C. Weight of calcine = 400 gms.' Result: 49.3 fo Cobalt, water soluble.  TEST No. 45F 100 gms 45B, roasted at 620 C. f o r 45 minutes. Weight of calcine  s  90 gms.  Result: 89 fo Cobalt, water soluble.  TEST No. 45G375 gms 45B, roasted at 625 C. f o r 45 minutes. Weight of calcine = 332 gms. 86 fo Cobalt, water soluble. Result:  TEST No. 45H 400 gms 450, roasted at 600 C. f o r 50 minutes. Weight of calcine = 597 gms. Result: 85 fo Cobalt, water soluble.  TEST No. 45J 400 gms 45 D, roasted at 600 C. f o r 50 minutes. Weight of calcine • 392 gms. Result: 86 fo Cobalt, water soluble.  TEST No. 45K 350 gms 45E, roasted at 600 C. f o r 50 minutes. Weight of calcine - 330 gms. Result: 68 fo Cobalt, water soluble.  BIBLIOQRAEHT • "" Hayward, Carle R. - "An Outline of Metallurgical Practise". D. Van Nostrand,. 1940. Schnabel, Dr. Carl, - Louis, Henry. - "Handbook of Metallurgy". Second Edition - McMillan and Co., 1907. L i d d e l l , Donald M. - "Handbook of Non-Ferrous Metallurgy". McGraw H i l l , 1926.  AOEJOWl^G-EMENTS The bulk of the work embodied i n t h i s report was discharged by F. A. Forward (B.A.Sc. Toronto), Professor of Metallurgy, and A. G. Lyle (B.A. Sc. B r i t . Col.), Assistant i n the department of Metallurgy, both of the University of B r i t i s h Columbia.  I t was  a pleasure to have  assisted i n t h i s research and a great p r i v i l e g e to be allowed to record the r e s u l t s .  To Mr. Forward I beg to record my respects, not only  for his contributing most of his time and energy but even more important, to h i s successful d i r e c t i o n of this research.  To Mr. Lyle, my respects  f o r h i s painstaking care and accuracy during a l l testing  procedures.  

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