C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/136, 204/62.5
C01B 11/00 (2006.01)
Patent
CA 1163419
ABSTRACT Alkali metal halates, such as sodium chlorate- containing liquors when produced in electrolytic cells may contain hexavalent chromium compounds which are objectionable impurities when permitted to remain in such products. These impure cell liquors adjusted to a pH of 5.5 to 9.5 are treated with divalent iron salts, such as ferrous sulfate or products formed from the reaction of divalent iron salts and hydrazine to reduce the soluble chromium (VI) compounds present to a hydrous ferric- chromic oxide precipitate. Separation of the pre- cipitate leaves a colorless chlorate-containing solution which is virtually free of chrome impurities. The chrome values of the precipitate are recovered as soluble chromium (VI) compounds by reacting with bleach or other oxidizing agents leav- ing an unreacted, disposable sol ? of nearly chrome- free hydrous ferric oxide. The recovered chromium compounds are available for recycling back to the electrolytic cell.
401678
Marcoux & Sher Swabey Mitchell Houle
Occidental Chemical Corporation
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