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Leaching of goethite in acid solutions Surana, Virendra Singh
Abstract
The leaching of goethite in solutions of perchloric, sulphuric, and hydrochloric acids and in perchloric acid in presence of sulphur dioxide has been investigated. Suspensions of goethite powder (-65, +150 mesh) were leached over a wide range of temperatures, acid concentrations and sulphur dioxide pressures. Strong solutions of hydrochloric acid leached goethite powder more rapidly than equivalent solutions of sulphuric acid, whilst at low concentrations sulphuric acid was the more active reagent. Perchloric acid was found to leach the mineral only very slowly. The rate of dissolution was found to increase with time in the early stages of leaching with all concentrations of sulphuric acid, with strong solutions of hydrochloric acid, and with perchloric acid solutions containing sulphur dioxide. This phenomenon has been correlated with changes in the surface morphology of the goethite during leaching. The rate data derived from the observed results have enabled the effects of temperature, acid type, concentration and partial pressure of sulphur dioxide on rate of leaching to be studied. A common mechanism of leaching is proposed in which protonation of the hydrated oxide surface is followed by adsorption of an anion and desorption of the ferric-anion complex.
Item Metadata
Title |
Leaching of goethite in acid solutions
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1969
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Description |
The leaching of goethite in solutions of perchloric, sulphuric, and hydrochloric acids and in perchloric acid in presence of sulphur dioxide has been investigated. Suspensions of goethite powder (-65, +150 mesh) were leached over a wide range of temperatures, acid concentrations and sulphur dioxide pressures.
Strong solutions of hydrochloric acid leached goethite powder more rapidly than equivalent solutions of sulphuric acid, whilst at low concentrations sulphuric acid was the more active reagent. Perchloric acid was found to leach the mineral only very slowly.
The rate of dissolution was found to increase with time in the early stages of leaching with all concentrations of sulphuric acid, with strong solutions of hydrochloric acid, and with perchloric acid solutions containing sulphur dioxide. This phenomenon has been correlated with changes in the surface morphology of the goethite during leaching.
The rate data derived from the observed results have enabled the effects of temperature, acid type, concentration and partial pressure of sulphur dioxide on rate of leaching to be studied. A common mechanism of leaching is proposed in which protonation of the hydrated oxide surface is followed by adsorption of an anion and desorption of the ferric-anion complex.
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Genre | |
Type | |
Language |
eng
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Date Available |
2011-06-09
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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 |
10.14288/1.0102302
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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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.