C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/222
C22B 11/06 (2006.01) C01G 5/02 (2006.01) C25C 3/34 (2006.01)
Patent
CA 1257970
ABSTRACT This invention provides processes for selectively recovering silver and gold values from zinc precipitate and precious metal electrolytic sludge feed materials containing 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 and form a saturated solution of silver chloride, 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, and cooled to precipitate the silver as substantially pure silver chloride. The solid residue containing the gold is then treated to recover gold. 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 be used in regenerating the spent ferric chloride-acid brine leach solution.
492612
Templeton John H.
Whitney John W.
American Hydromet A. General Partnership
Osler Hoskin & Harcourt Llp
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