Gold and silver extraction by ammoniacal thiosulfate leaching from a rhyolite ore

D. Zipperian; S. Raghavan; J. P. Wilson

doi:10.1016/0304-386X(88)90041-2

Gold and silver extraction by ammoniacal thiosulfate leaching from a rhyolite ore

D. Zipperian, S. Raghavan, J. P. Wilson

Research output: Contribution to journal › Article › peer-review

145 Scopus citations

Abstract

An investigation has been carried out to identify the parameters of importance in the dissolution of gold and silver values from an ore using ammoniacal thiosulfate solutions containing copper. The chemistry of the dissolution process has been analyzed through the construction of E_H -pH diagrams. The experimental results show that it is possible to solubilize about 70% of silver and 90% of gold values in one hour. The leaching process is quite sensitive to thiosulfate and ammonia concentrations. Maintenance of proper E_h and pH conditions is necessary to prevent precipitation of copper as Cu₂S with concomitant loss of silver values from solution.

Original language	English (US)
Pages (from-to)	361-375
Number of pages	15
Journal	Hydrometallurgy
Volume	19
Issue number	3
DOIs	https://doi.org/10.1016/0304-386X(88)90041-2
State	Published - Jan 1988
Externally published	Yes

ASJC Scopus subject areas

Metals and Alloys
Materials Chemistry
Industrial and Manufacturing Engineering

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10.1016/0304-386X(88)90041-2

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title = "Gold and silver extraction by ammoniacal thiosulfate leaching from a rhyolite ore",

abstract = "An investigation has been carried out to identify the parameters of importance in the dissolution of gold and silver values from an ore using ammoniacal thiosulfate solutions containing copper. The chemistry of the dissolution process has been analyzed through the construction of EH -pH diagrams. The experimental results show that it is possible to solubilize about 70% of silver and 90% of gold values in one hour. The leaching process is quite sensitive to thiosulfate and ammonia concentrations. Maintenance of proper Eh and pH conditions is necessary to prevent precipitation of copper as Cu2S with concomitant loss of silver values from solution.",

author = "D. Zipperian and S. Raghavan and Wilson, {J. P.}",

note = "Funding Information: The authors wish to acknowledge the partial financial support for the work provided by Kerley Industries Inc., Sahuarita, Arizona. Dr. Zipperian also gratefully acknowledges the support made possible through a SOHIO graduate fellowship.",

year = "1988",

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doi = "10.1016/0304-386X(88)90041-2",

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T1 - Gold and silver extraction by ammoniacal thiosulfate leaching from a rhyolite ore

AU - Zipperian, D.

AU - Raghavan, S.

AU - Wilson, J. P.

N1 - Funding Information: The authors wish to acknowledge the partial financial support for the work provided by Kerley Industries Inc., Sahuarita, Arizona. Dr. Zipperian also gratefully acknowledges the support made possible through a SOHIO graduate fellowship.

PY - 1988/1

Y1 - 1988/1

N2 - An investigation has been carried out to identify the parameters of importance in the dissolution of gold and silver values from an ore using ammoniacal thiosulfate solutions containing copper. The chemistry of the dissolution process has been analyzed through the construction of EH -pH diagrams. The experimental results show that it is possible to solubilize about 70% of silver and 90% of gold values in one hour. The leaching process is quite sensitive to thiosulfate and ammonia concentrations. Maintenance of proper Eh and pH conditions is necessary to prevent precipitation of copper as Cu2S with concomitant loss of silver values from solution.

AB - An investigation has been carried out to identify the parameters of importance in the dissolution of gold and silver values from an ore using ammoniacal thiosulfate solutions containing copper. The chemistry of the dissolution process has been analyzed through the construction of EH -pH diagrams. The experimental results show that it is possible to solubilize about 70% of silver and 90% of gold values in one hour. The leaching process is quite sensitive to thiosulfate and ammonia concentrations. Maintenance of proper Eh and pH conditions is necessary to prevent precipitation of copper as Cu2S with concomitant loss of silver values from solution.

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Gold and silver extraction by ammoniacal thiosulfate leaching from a rhyolite ore

Abstract

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