Method for recovering chromium from chromium-bearing material

Details Method for recovering chromium from chromium-bearing material Method for recovering chromium from chromium-bearing material

1989-09-05

1990-10-30

Stoll, Robert L.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 55, 423 57, 423140, 423150, 75101R, 75108, 75119, 75121, 75 2, C01G 3700, C22B 3432

Patent

active

049667602

ABSTRACT:
A method for recovering chromium from chromium-bearing material which comprises heating the material which can contain any one or combination of Co, Ni, Fe, Mo, and W with solid alkali metal hydroxide in an oxidizing atmosphere at 600.degree. C.-1000.degree. C. to form a fused material containing water soluble compounds of Cr, Mo, and W contained therein. The fused material is cooled and contacted with water to form a leach solution and a residue. The leach solution is adjusted to a pH of from about 5-8 with sulfuric acid, and a water soluble calcium salt is added. The chromium-rich liquor is then adjusted to a pH of 1-3 with sulfuric acid. Sodium metabisulfite is added to the chromium-rich liquor to reduce the chromium to the trivalent state after which the pH is adjusted to 5-8 with a base to form a precipitate of essentially all of the chromium.

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