Chromate removal by precipitation

Details Chromate removal by precipitation Chromate removal by precipitation

1977-06-27

1978-04-25

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 98, 204101, 204128, 210 50, 423 55, 423511, 423571, 423607, C25B 126, C01B 1700

Patent

active

040861503

ABSTRACT:
Chromates are removed from aqueous alkali metal chlorate solutions by either of two processes. In the first process, a water-soluble sulfide is added to react with the chromate, and then a ferrous salt is added. The soluble sulfate is converted to elemental sulfur and the chromate is converted to an insoluble trivalent Cr-containing material which is removed from solution. In the second process an "iron mud" is prepared by reacting a ferrous salt with sodium hydroxide and added so as to precipitate insoluble trivalent chromium-containing material.

REFERENCES:
patent: 3294680 (1966-12-01), Lancy
patent: 3325401 (1967-06-01), Lancy
patent: 3427236 (1969-02-01), Scholander et al.
patent: 3616344 (1971-10-01), Peterson et al.
patent: 3740331 (1973-06-01), Anderson
patent: 3835001 (1974-09-01), O'Brien
patent: 3835042 (1974-09-01), La Lancette et al.
patent: 3901805 (1975-08-01), Stewart
patent: 3961029 (1976-06-01), Senoo
patent: 3980751 (1976-09-01), Foulkes
patent: 3981965 (1976-09-01), Gancy et al.

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