Process for extracting noble metals

Details Process for extracting noble metals Process for extracting noble metals

C - Chemistry, Metallurgy

22

B

53/168, 53/225,

C22B 3/06 (2006.01) C22B 3/46 (2006.01) C22B 11/00 (2006.01) C25C 1/20 (2006.01) C25C 5/02 (2006.01)

Patent

CA 2006893

PROCESS FOR EXTRACTING NOBLE METALS ABSTRACT OF THE DISCLOSURE The invention provides a hydrometallurgical process for extracting noble metals from raw materials containing the same, comprising a) leaching the raw materials with a mineral acid to leave a residue containing the noble metals, b) treating said residue with a substantially non-aqueous liquid comprising bromine and an apolar organic solvent in which bromine dissolves to form a complex of the formula R[MeBrx] wherein x = 4 - 6 Me = Au, Ag, Pt, Pd Os, Ru, Rh, Ir and R is an organic moiety of the solvent, and c) subjecting the complex-containing substantially non-aqueous liquid to electrolysis whereby noble metal is deposited on the cathode and removable therefrom and bromine liquid is formed at the anode and immediately dissolves in the organic solvent.

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