Removal of chromium from cobalt

Details Removal of chromium from cobalt Removal of chromium from cobalt

1985-04-01

1986-03-25

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 53, 423140, 423143, C01G 3702, C01G 5100

Patent

active

045782512

ABSTRACT:
A process is disclosed for removing chromium from cobalt. The process involves first contacting an acidic cobalt chloride solution with an oxidizing agent, followed by adjusting the pH to from about 3.2 to about 5.5 with a base at a sufficient temperature to form a first solid containing essentially all of the chromium and a portion of the cobalt and a first liquor containing the balance of the cobalt, and then separating the first solid from the first liquor. The first solid is then heated at a sufficient temperature to remove essentially all of the water and form a second solid which is contacted with sufficient water and ammonium hydroxide to form a slurry which is at a pH of greater than about 3.8. The slurry is made up essentially of a second liquor which contains essentially all of the cobalt which was present in the second solid and a third solid which contains essentially all of the chromium which was initially present in the acidic cobalt chloride solution and which is then separated from the second liquor.

REFERENCES:
patent: 3224874 (1965-12-01), Daugherty
patent: 3544309 (1970-12-01), Fletcher et al.
patent: 3975495 (1976-08-01), Bowerman
patent: 4042474 (1977-08-01), Saarinen

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