Process for extracting gold by decomposition of lead cyanide...

Details Process for extracting gold by decomposition of lead cyanide... Process for extracting gold by decomposition of lead cyanide...

C - Chemistry, Metallurgy

22

B

53/229

C22B 11/08 (2006.01)

Patent

CA 1262050

This invention relates to the extraction of gold from gold- bearing materials like ores, concentrates, tailings, municipal sewage and other materials. The process consists of leaching the gold-bearing material with solid lead cyanide compound, which an be formed in-situ in the pulp by mixing soluble lead compounds like lead nitrate, lead acetate and other lead salts with commonly used cyanide reagents like sodium cyanide, calcium cyanide and potassium cyanide at a much lower PH than the PH to be used later in the actual leaching process for the decomposition of lead cyanide compound and generation of active CN- ions. Therefore the main innovation of this process lies in the fact that once solid lead cyanide compound has been added to or formed in the leach pulp it will be decomposed at a higher PH to produce more active "nascent" CN-.

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