Treatment of arsenical effluents

Details Treatment of arsenical effluents Treatment of arsenical effluents

C - Chemistry, Metallurgy

02

F

362/59

C02F 1/00 (2006.01) C02F 1/52 (2006.01) C02F 11/00 (2006.01) C04B 28/10 (2006.01)

Patent

CA 1111157

ABSTRACT OF THE DISCLOSURE A method is disclosed for treating aqueous effluents containing at least one of the elements arsenic and antimony in which said element is oxidized to the pentavalent stage, lime is then added to the effluent in excess, preferably 10 to 50% in excess, of the amount sufficient to precipitate a calcium compound of the element and maintain the pH of the effluent at a value of at least 12, and the precipitated compound and excess lime permitted to harden. The resulting slurry mixture preferably is partially dewatered after precipitation of the calcium compound to a 10 to 40% by weight solids content prior to hardening. A compound chosen from pozzolanic slag, pozzolanic fly ash, Portland cement, soluble silicates and lime or mixtures thereof in an amount in the range of 10 to 50% by weight of the partially dewatered slurry mixture may be added after dewatering.

324552

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