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A novel method for metal recovery from zinc & lead slags Zhang, Yanjun
Abstract
Conventional zinc fuming from lead blast furnace slags cannot continue when zinc and lead contents are below 1.5-2.5 wt.% and 0.1-0.5 wt.% respectively, because of solid iron formation, which also causes the formation of accretions, foaming of slag, and contamination of the fume. A new method, electroreduction, was developed in a previous study to recover the heavy metals zinc, lead, indium and germanium from final zinc fumer slag. A series of experiments was also conducted in this study using two types of fumer slag from COMINCO. Zinc content was 4.5wt% in one slag and 1.5wt% in another slag. Experimental data indicated that about 50% of the zinc and most of the lead could be removed from both slags by 90 minute of electrorefining. Following the work on the fumer slags, a study was conducted on the potential to reduce lead and zinc directly from COMINCO's Kivcet slag (containing about 16 wt% zinc and 10 wt% lead) and potentially obviate the need for slag fuming. Metal recovery from the Kivcet slag was examined using the three methods used for the fumer slag study: holding at temperature to allow the divalent iron to reduce the metal ions into the gas phase; equilibration with a copper "getter"; and electroreduction into a liquid copper cathode using a graphite anode. The presence of metallic lead and carbon in the Kivcet slag has a significant influence on the recovery of metal from the slag in subsequent processing. Holding of the slag at temperature permitted the recovery of much of the metallic lead as vapor and some small recovery of zinc as fume. When copper was used as a getter, more zinc and lead were recovered. In electrorefining, lead recovery was much higher than that in equilibrating with copper, but there was no obvious enhancement in zinc recovery. A series of experiments were also conducted in which the Kivcet slag was treated to remove some of the zinc and the lead and then was electro-refined three times. Zinc and lead contents in the final slag decreased to 5.9% and 0.3% respectively. Although most of the lead was recovered, further refining would still be required to capture the remaining zinc metal.
Item Metadata
Title |
A novel method for metal recovery from zinc & lead slags
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2003
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Description |
Conventional zinc fuming from lead blast furnace slags cannot continue when zinc and
lead contents are below 1.5-2.5 wt.% and 0.1-0.5 wt.% respectively, because of solid iron
formation, which also causes the formation of accretions, foaming of slag, and
contamination of the fume. A new method, electroreduction, was developed in a previous
study to recover the heavy metals zinc, lead, indium and germanium from final zinc
fumer slag. A series of experiments was also conducted in this study using two types of
fumer slag from COMINCO. Zinc content was 4.5wt% in one slag and 1.5wt% in
another slag. Experimental data indicated that about 50% of the zinc and most of the
lead could be removed from both slags by 90 minute of electrorefining.
Following the work on the fumer slags, a study was conducted on the potential to reduce
lead and zinc directly from COMINCO's Kivcet slag (containing about 16 wt% zinc and
10 wt% lead) and potentially obviate the need for slag fuming. Metal recovery from the
Kivcet slag was examined using the three methods used for the fumer slag study:
holding at temperature to allow the divalent iron to reduce the metal ions into the gas
phase; equilibration with a copper "getter"; and electroreduction into a liquid copper
cathode using a graphite anode.
The presence of metallic lead and carbon in the Kivcet slag has a significant influence on
the recovery of metal from the slag in subsequent processing. Holding of the slag at
temperature permitted the recovery of much of the metallic lead as vapor and some
small recovery of zinc as fume. When copper was used as a getter, more zinc and lead
were recovered. In electrorefining, lead recovery was much higher than that in
equilibrating with copper, but there was no obvious enhancement in zinc recovery. A
series of experiments were also conducted in which the Kivcet slag was treated to
remove some of the zinc and the lead and then was electro-refined three times. Zinc and
lead contents in the final slag decreased to 5.9% and 0.3% respectively. Although most
of the lead was recovered, further refining would still be required to capture the
remaining zinc metal.
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Extent |
6078455 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-10-29
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0078534
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2003-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.