Hydrometallurgical process for extracting metal values from comp

Details Hydrometallurgical process for extracting metal values from comp Hydrometallurgical process for extracting metal values from comp

1981-11-04

1983-09-20

Hearn, Brian E.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

423 29, 423 34, 423 37, 423 41, 423101, 423 87, 423150, 423602, C01G 500, C01G 5100, C01G 2802, C22B 300

Patent

active

044055692

ABSTRACT:
This invention relates to environmentally sound hydrometallurgical methods and processes for extraction of cobalt, nickel and silver from complex concentrates. The finely ground minerals are converted during an oxidative caustic leach at elevated pressures and temperatures to insoluble metal hydroxides and are separated from soluble sodium arsenate and sodium sulphate. Cobalt and nickel are extracted from the caustic cake during a two-stage sulphuric acid leach. Solution purification for cobalt and nickel recovery proceeds on the basis that only one waste residue and one liquid effluent are generated which meet strict environmental standards. A small amount of cyanidation residue is generated after silver extraction by cyanidation from the acid leach residue. Metal values extraction reaches +99.0%. Arsenic and sulphur can be recovered in an innovative recycle system as sodium, zinc or copper arsenate chemicals and as anhydrous sodium sulphate.

REFERENCES:
patent: 515418 (1894-02-01), Janin
patent: 2304722 (1942-12-01), Witman
patent: 2951741 (1960-09-01), Sill
patent: 4029733 (1977-06-01), Faugeras
Chemical Abstracts, vol. 77, (1972), No. 51317f.
Ind. & Eng. Chem., vol. 49, No. 10, (Oct. 1957), p. 30A, "Sill Process Now On Stream".
Chemical Abstracts, vol. 54, (1960), No. 8513b.

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