Compositions – Solvents
Patent
1981-11-20
1984-01-24
Lovering, Richard D.
Compositions
Solvents
204109, 423 29, B01F 100
Patent
active
044275714
ABSTRACT:
The disclosure relates to desorption of gold or silver from particulate materials and in particular to 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, preferably, 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.degree. to 50.degree. 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.
REFERENCES:
patent: 3787327 (1974-01-01), Emrick
Muir David M.
Parker Alan J.
Anumin Pty. Ltd.
Hinds William R.
Lovering Richard D.
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