Process for recovering copper

C - Chemistry – Metallurgy – 22 – B

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C22B 15/00 (2006.01)

Patent

CA 1153896

"PROCESS FOR RECOVERING COPPER" ABSTRACT OF THE DISCLOSURE A process for extracting copper from copper-containing materials comprises leaching in a first stage such materials with sulphuric acid to produce a cupric sulphate containing liquor, and treating such liquor with sulphur dioxide, preferably at substantially atmospheric pressure while maintaining the pH of the liquor at a level above 1, preferably between 1 and 3, in order to precipitate Chevreul's salt, and in a second stage heating the Chevreul's salt in the presence of water, or water and sulphur dioxide, or sulphurous acid, under pressure and optionally in the presence of a suitable modifying agent to yield metallic copper. Magnesium oxide is the preferred modifying agent.

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