C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/225
C22B 3/04 (2006.01) C22B 3/06 (2006.01) C22B 11/00 (2006.01)
Patent
CA 1340169
An aqueous composition adapted for dilution to provide a leaching solution effective for leaching of a precious metal comprising gold or silver from a source thereof. The composition comprises bromide ion, perbromide ion, molecular bromine, at least about 2% by weight bromate ion, and a metal ion selected from among alkali metal and alkaline earth metal. The equivalent molecular bromine content of the composition is between about 10% and about 40% by weight and the ratio of the molar concentration of bromate ion to the sum of the molar concentrations of molecular bromine and perbromide ion in the composition is between about 0.05 and about 0.8. A leaching solution produced by dilution of the aqueous composition, and a method for recovery of precious metals from sources thereof by use of the leaching solution, are also disclosed.
614361
Great Lakes Chemical Corporation
Smart & Biggar
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