Process for working up copper cementate sludges

Details Process for working up copper cementate sludges Process for working up copper cementate sludges

1974-03-18

1978-08-01

Rosenberg, P. D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 6, 75 21, 75101R, C22B 100, C22B 111

Patent

active

041040554

ABSTRACT:
A process for recovering metallic values from arsenic-containing copper cementate sludges. The cementate is admixed with lime in an amount sufficient to form calcium sulfate by reaction with any water-soluble sulfate present in the cementate, and calcium arsenate from the arsenic present in the cementate. The admixture is roasted in an oxygen-containing atmosphere at a temperature above about 300.degree. C, to oxidize the metallic values to a state in which said values are soluble in aqueous acid. The roasted material is leached with aqueous acid to dissolve said values. The values can be recovered from the solution produced in the leaching step by known procedures. By the process of the invention, polluting by arsenic is prevented.

REFERENCES:
patent: 2316330 (1943-04-01), Hawk
patent: 2639974 (1953-05-01), Ross
patent: 3230071 (1966-01-01), Marvin
patent: 3330648 (1967-07-01), Vian-Ortuno
patent: 3367740 (1968-04-01), Zubryckyj
patent: 3402041 (1968-09-01), Feld
patent: 3409427 (1968-11-01), Bonnivard
patent: 3493365 (1970-02-01), Pickering

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