Removal of selenium from sulphate solutions

Details Removal of selenium from sulphate solutions Removal of selenium from sulphate solutions

1978-08-14

1980-09-16

Vertiz, O. R.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423 42, 423141, 423508, 204DIG13, C01G 310, C01B 1900, C25C 112

Patent

active

042229995

ABSTRACT:
A process for purifying copper sulfate solution by converting contained hexavalent selenium to tetravalent selenium which is amenable to removal from solution by heating and maintaining the solution at a temperature in the range of about 135.degree. to 220.degree. C. under a non-oxidizing atmosphere in the presence of bivalent iron. The converted selenium is removed from the solution either by co-precipitation with ferrous iron oxidized and hydrolyzed to ferric oxide at a temperature in the range of 135.degree. to 220.degree. C. and under an oxygen pressure of about 140 to 450 kPa or by cementation with a metal powder at a temperature in the range of about 25.degree. to 85.degree. C. at about ambient pressure under a non-oxidizing atmosphere.

REFERENCES:
patent: 3933635 (1976-01-01), Marchant
patent: 3959097 (1976-05-01), Queneau et al.
patent: 3964901 (1976-06-01), Swinkels et al.
patent: 4026797 (1977-05-01), Nikolic et al.
patent: 4055630 (1977-10-01), McCoy et al.

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