Process for chromium removal using an inorganic sulfur compound

Details Process for chromium removal using an inorganic sulfur compound Process for chromium removal using an inorganic sulfur compound

1992-04-22

1993-10-19

Niebling, John

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423607, 210720, 210724, C01G 3702, B01D 2100

Patent

active

052543218

ABSTRACT:
A method has been devised for removing chromium ion from a chromium ion containing liquid and recovering chromium oxide in an usable form by (a) adjusting the temperature of the liquid to an optimal temperature to maximize reduction and simultaneous precipitation of the chromium oxide; (b) adding a reducing agent to the liquid to form a mixture, where the reducing agent is at least one inorganic sulfur compound selected from the group of sulfur compounds where sulfur is in the 4.sup.+ oxidation state and (c) adjusting the pH of the mixture to a pH between 5 and 7.

REFERENCES:
patent: 4259297 (1981-03-01), Kaczur et al.
patent: 4376099 (1983-03-01), Yamamoto et al.

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