Extraction and recovery of gold
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United States of America Patent
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Nov 9, 1993
Grant Date -
N/A
app pub date -
Sep 12, 1991
filing date -
Feb 23, 1990
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Abstract
A process for the hydrometallurgical recovery of gold from gold-bearing material comprising the step of treating gold-bearing material with an acidic lixiviant solution containing thiourea and ferric ions, characterized in that the said solution also includes a complexing agent for ferric ions, whereby consumption of thiourea is significantly reduced. The complexing agent may be selected from the group consisting of di- and tri-carboxylic acids, phosphoric acid and phosphate salts, thiocyanates, fluorides, fluosilicic acid and fluosilicate salts, EDTA and EDTA salts, and mixtures thereof.
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