C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/234, 252/30
C22B 11/08 (2006.01) C01G 5/00 (2006.01) C01G 7/00 (2006.01) C22B 3/26 (2006.01) C22B 3/28 (2006.01)
Patent
CA 1180315
ABSTRACT OF THE DISCLOSURE The present invention relates to desorption of gold or silver from particulate materials and in particular provides a composition for use in separating gold or silver from particulate material on which it is adsorbed, which comprises a homogeneous phase mixture of aqueous solvent having dissolved therein at least 20% by volume of polar organic solvent or mixture of polar organic solvents selected from ketones containing up to 5 carbon atoms and nitriles containing up to 3 carbon atoms, said solvent mixture containing from 0.1% by weight to saturation of a water soluble inorganic cyanide or thio cyanate salt which produces free cyanide or thio cyanate ions in water. The invention also provides a method of separating gold or silver from particulate materials on which the gold is adsorbed, where the particulate material is eluted with a composition in accordance with the present invention at a temperature in the range from 10 to 50°C, for a period of time sufficient to desorb at least a portion of the adsorbed gold or silver from the particulate material, and then separating the composition containing desorbed gold or silver from the particulate material.
390706
Muir David M.
Parker Alan J.
Muir David M.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Parker Alan J.
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