Method for precipitation of heavy metal sulfides

Details Method for precipitation of heavy metal sulfides Method for precipitation of heavy metal sulfides

1982-05-21

1983-12-27

Castel, Benoit

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210724, 210726, 210912, 210914, C02F 152

Patent

active

044229437

ABSTRACT:
A method for the removal of heavy metal ions from an aqueous solution which comprises the steps of admixing an aqueous slurry of FeS.sub.2 with a heavy metal ion bearing aqueous solution at a pH above 7, preferably 8-12, the slurry providing at least the stoichiometric amount of FeS.sub.2, preferably 2 to 6 times the stoichiometric amount of FeS.sub.2, for precipitating the heavy metal ions from the solution as sulfides and separating the precipitated sulfides from the aqueous solution. Desirably, a portion of the heavy metal ions are precipitated from the solution as heavy metal hydroxides and the precipitated hydroxides are separated from the solution prior to admixing the solution with the FeS.sub.2 slurry.

REFERENCES:
patent: 2145816 (1939-01-01), Stoops
patent: 3740331 (1973-06-01), Anderson et al.
patent: 4086150 (1978-04-01), Kindl et al.
patent: 4102784 (1978-07-01), Schlauch
patent: 4127989 (1978-12-01), Mickelson
patent: 4147626 (1979-04-01), Findlay et al.
patent: 4329224 (1982-05-01), Kim
patent: 4354942 (1982-10-01), Kaczur et al.
Chem. Abstracts 94:197284(r), "Reduction and Removal of Hexavalent Chromium from Effluent Water Using Pyrites"; (1981).

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