Removal of heavy metals from aqueous solutions

Details Removal of heavy metals from aqueous solutions Removal of heavy metals from aqueous solutions

1976-06-04

1977-09-13

Vertiz, O. R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iva metal

210 50, 210 53, 423158, 423164, 423184, 423198, 423595, 423607, 423633, C01G 3714

Patent

active

040482839

ABSTRACT:
Aqueous process streams or waste waters destined for merging with public waters sometimes contain deleterious amounts of heavy metals, e.g., lead (Pb) compounds. The heavy metal compounds may be substantially removed or reduced to harmless levels by treating the acidic aqueous streams with chromate or dichromate ions, then heating the solution to oxidize organics and/or heavy metal-organics, then raising the pH to an alkaline pH to precipitate the heavy metal chromate, and separating the heavy metal chromate from the aqueous stream.

REFERENCES:
patent: 305389 (1884-09-01), Hore
patent: 305391 (1884-09-01), Hore
patent: 868807 (1907-10-01), Potter
patent: 1225374 (1917-05-01), Toabe
patent: 1784950 (1930-12-01), Udy
patent: 2285115 (1942-06-01), Gans et al.
patent: 3616344 (1971-10-01), Peterson et al.

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