发明名称 GOLD AND SILVER EXTRACTION TECHNOLOGY
摘要 The present invention relates to a process for chemical extraction of gold and silver from low grade and refractory pyritic concentrates containing minimum 1 ppm Au, by their leaching in enamelled cast iron reactors, steel plated lead or plastic coated steel, at room temperature, in ammoniac solutions (pH 8-10) of sodium thiosulfate (50-60 g/l Na2S2O3. 5 H2O) with a divalent copper salt as catalyst (3-4 g/l Cu).The suspension resulting after 2-4 hours of reaction is filtered. The thiosulfate solution containing minimum 5 mg/l undergoes an electrolysis process with insoluble anodes. Copper, gold and silver is deposited in the cell as a sludge, and the electrolyte having a maximum content of Au of 1 mg/l, is recycled to the leaching operation of raw material, after correction of copper content and alkalinity to the baseline values. The copper, gold and silver deposit, separated as a sludge, is purified by leaching copper in a solution of 30-40% sulphuric acid at a solid: liquid ratio of 1:5-1:10, at a temperature of 85-90° C. for 2-4 hours under air bubbling. The suspension is filtered. The copper leached as CuSO4.5H20 returns to the extraction process of gold and silver.
申请公布号 US2013341203(A1) 申请公布日期 2013.12.26
申请号 US201214003835 申请日期 2012.03.08
申请人 MALUSEL VIOREL ALEXANDRU;POPA IOAN FLORENTIN;GOLDSTEIN JACK;OSANU LIANA ROZICA 发明人 MALUSEL VIOREL ALEXANDRU;POPA IOAN FLORENTIN;GOLDSTEIN JACK;OSANU LIANA ROZICA
分类号 C25C1/20 主分类号 C25C1/20
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