Method and system for extracting and refining gold from ores

Details Method and system for extracting and refining gold from ores Method and system for extracting and refining gold from ores

C - Chemistry, Metallurgy

22

B

C22B 11/00 (2006.01) C22B 3/02 (2006.01) C25C 1/20 (2006.01)

Patent

CA 2208665

A process and system and for extracting and refining gold from ores using relatively benign and inexpensive chemicals, fewer process steps, and permittingthe recycling and re-use of process chemicals. The invention is preferably implemented as a two part process. In a first part process, gold is extracted from the ore and dissolved in a chemical solution to form a gold complex. The chemical solution preferably includes a KI and I2. Optionally, Isopropyl alcohol is mixedwith the KI and I2 to serve as an accelerant. In a second part process, the complex is reduced to gold from the solution, preferably by one of two methods. The first method precipitates the gold complex by washing and decomposing of the gold complex to form pure gold. The second method electrolytically plates the gold from the gold complex solution onto a cathode to obtain pure gold.

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