Recovery of precious metal

Details Recovery of precious metal Recovery of precious metal

C - Chemistry, Metallurgy

22

B

C22B 3/42 (2006.01) C22B 3/24 (2006.01) C22B 11/08 (2006.01)

Patent

CA 2132334

An improved process for recovery of precious metals such as gold or silver using novel ion exchnage resins having aryl guanidyl functionality from aryl guanidine compounds having a pKa at 25°C less than 13 and preferably less than 12. The resins have improved elution properties compared to known guanidine reagents using caustic eluant solutions, particularly improved eluant solutions such as a mixture of sodium hydroxide and sodium benzoate. A selective elution of base metals may be carried out before elution of the precious metals from the resins having guanidyl functionality.

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