Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1984-10-11
1987-05-05
Doll, John
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75101R, 75101BE, 75114, 75109, 75115, 75117, 204 61, 204 64R, 423 27, 423 38, 423 39, 423 41, 423 42, 423 45, 423 46, 423100, 423103, C22B 1100
Patent
active
046629386
ABSTRACT:
This invention provides processes for selectively recovering silver and gold values from feed materials containing both precious metals, and comprises leaching the feed material with a hot ferric chloride-acid brine leach solution for a time sufficient to dissolve the silver, but wherein the gold is not dissolved and remains with the solid residue. The silver-containing ferric chloride-acid brine leachate is separated from the solid residue containing the gold. The leach solution is then cooled to precipitate the silver as silver chloride. The solid residue containing the gold is then leached with hypochlorous acid to dissolve the gold, and after separating the solids form the gold-containing hypochlorous acid leach solution, the gold is precipitated by contacting the solution with sulfur dioxide. The silver chloride may be further processed in a fused salt electrolysis step at or above the melting point of silver to produce a substantially pure silver and chlorine gas. The chlorine gas can then be used in regenerating the spent ferric chloride-acid brine leach solution.
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Templeton John H.
Whitney John W.
Doll John
Stoll Robert L.
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