Extraction and purification of silver

Details Extraction and purification of silver Extraction and purification of silver

C - Chemistry, Metallurgy

22

B

53/225

C22B 7/00 (2006.01) C01G 5/00 (2006.01) C25C 1/20 (2006.01)

Patent

CA 1069704

EXTRACTION AND PURIFICATION OF SILVER Abstract of Disclosure A method is provided for extracting silver from a silver sulfate-bearing substance, such as oxide materials, metal or metal sulfate mixtures containing silver sulfate which comprises subjecting said substance to aqueous leaching to remove soluble salts therefrom and leave a residue, taking the residue containing silver sulfate and other insoluble materials, such as insoluble salts, and forming a slurry with an aqueous solution of a metal sulfate, such as calcium nitrate, the amount of calcium nitrate being at least sufficient to effect metathetical exchange with the silver sulfate and form silver nitrate solution containing substantially the silver originally present in the silver-sulfate bearing substance, and separating the silver nitrate solution from the residue remaining, and then purifying said solution, the silver being thereafter recovered from the silver nitrate solution by hydrolytic precipitation, electrowinning or other suitable means.

246461

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