Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1975-07-25
1976-12-07
Vertiz, Oscar R.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75108, 75118R, 204109, 423 35, 423 43, C22B 700, C22B 1104, C25C 120
Patent
active
039960463
ABSTRACT:
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 a 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.
REFERENCES:
patent: 1182320 (1918-05-01), Ryan
patent: 1305787 (1919-06-01), Ferguson
patent: 3141731 (1964-07-01), Dietz
Harkins, W. D. "The Effect of Salts Upon the Solubility of Other Salts", J.A.C.S. vol. 33, No. 12, Dec. 1911 pp. 1811-1814.
Hoffmann James E.
Parker Peter D.
Sabo Andrew C.
Amax Inc.
Hearn Brian E.
Kalil Eugene J.
Serijan Kasper T.
Vertiz Oscar R.
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