Slimes treatment process

Details Slimes treatment process Slimes treatment process

C - Chemistry, Metallurgy

22

B

53/285

C22B 15/08 (1980.01)

Patent

CA 1091035

SLIMES TREATMENT PROCESS ABSTRACT OF THE DISCLOSURE: Slimes from electrolytic copper refinery are first treated by leaching them with dilute sulphuric acid under an oxygen partial pressure of up to 50 psi and an elevated temperature, until copper and tellurium present in the slimes are substan- tially dissolved, and effecting a liquid-solid separation of the leached slurry so produced to separate the leach liquor from the leach slimes. The leach liquor is then treated with metallic copper to cement the tellurium as copper telluride. The latter is separated from the remaining solution which is suitable for the production of copper sulphate. The leach slimes containing mainly selenium, lead, silver, gold and other impurities are dried, mixed with a binder and pelletized and the pellets are then roasted to remove selenium as selenium dioxide. Finally, the roasted pellets are smelted to remove the remaining impu- rities leaving a doré metal containing essentially silver and gold.

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