C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
53/284
C25C 1/12 (2006.01) C22B 15/00 (2006.01)
Patent
CA 1164219
ABSTRACT OF THE DISCLOSURE A system and process are provided for recovering copper from a contaminated copper-bearing source such as copper smelter flue dust. In carrying out the process the copper-bearing source is leached in an acidic solution to produce a liquor containing dissolved copper and dissolved contaminants. Simple copper sulfides are precipitated from the liquor by reacting the liquor with chalcopyrite and sulfur dioxide. Copper is recovered from the precipitated sulfides. The system for recovering copper from a copper-bearing source includes a multi-stage countercurrent leach circuit which utilizes an acidic leach solution to produce a liquor containing dissolved copper. The circuit has a first stage to which the copper- bearing source is introduced and a final stage wherein the leach solution contains greater than about 150 gpl sulfuric acid. In addition there is provided a precipitation circuit wherein the liquor is reacted with chalcopyrite solids and sulfur dioxide to precipitate dissolved copper from the liquor as simple copper sulfides. Finally, there is provided a copper recovery circuit for recovering copper from the simple copper sulfides. A novel process is provided for precipitating simple copper sulfides from a solution containing both dissolved copper and dissolved contaminants. The solution is combined with precipitation product such that substantially all ferric iron contained in the solution is reduced to ferrous iron. The ferric-free solution is reacted with chalcopyrite solids and sulfur dioxide to precipitate the dissolved copper as simple copper sulfides.
369162
Baczek Frank A.
Jueschke Alexander A.
Lewis Daniel M.
Otto Jack C.
Tuttle Lawrence L.
Envirotech Corporation
Macrae & Co.
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