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

1993-07-28

1994-08-09

Lieberman, Paul

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423607, 423 57, 210720, 210724, C10G 3702, B01D 2100

Patent

active

053364759

ABSTRACT:
A method has been devised for removing chromium ions from a chromium ion containing liquid and recovering chromium oxide in a 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; (d) optionally further adjusting the pH of the mixture to a pH between above 7 to 12; and (e) separating the chromium from the mixture.

REFERENCES:
patent: 3961029 (1976-06-01), Senoo
patent: 4259297 (1981-03-01), Kaczur et al.
patent: 4338200 (1982-07-01), Zeijlstra
patent: 4376099 (1983-03-01), Yamamoto et al.
patent: 5093089 (1992-03-01), Alford et al.
patent: 5254321 (1993-10-01), Jackson

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