C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/225, 23/330,
C22B 11/00 (2006.01) C01B 17/06 (2006.01) C22B 1/02 (2006.01) C22B 13/00 (2006.01)
Patent
CA 1057506
ABSTRACT OF THE DISCLOSURE A process for producing metallic lead and silver from materials such as ores and concentrates containing the corre- sponding sulfides and particularly a mixture of materials such as galena and tetrahedrite in which process the materials are initially roasted under neutral conditions which include a non- oxidizing or even slightly reducing atmosphere at an elevated temperature for a time equivalent to about 1.5 hours at about 550-600°C. to produce a roasted mineral product in which the roasting causes certain unidentified changes but with the resulting roasted product being more easily leachable so that the process of removing the silver and lead can be greatly simplified. The leach- ing and separating of the silver and lead includes subjecting the neutral roasted material to a ferric leach such as with an aqueous solution of ferric chloride to convert the lead and silver sulfides to lead and silver chloride, then subjecting the solid residue from this first leaching to a second leaching with aqueous sodium chlorine brine to dissolve these lead and silver salts followed by separating the lead and silver salts from the brine leached material to leave a final solid as a final residue that may be discarded and then separating the lead and then the silver from the filtrate that contains the lead and silver salts.
241842
Baker Richard D.
Cottam Stephen M.
Day Howard E.
Griffith William A.
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