Method of making chromic oxide

Details Method of making chromic oxide Method of making chromic oxide

1992-03-25

1993-06-01

Rosenberg, Peter D.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

C01G 3702

Patent

active

052157270

ABSTRACT:
Disclosed is a method of making hydrated chromic oxide of low sodium content by forming an aqueous solution of sodium bichromate, reducing the sodium bichromate to chromic oxide using sucrose or formaldehyde, which results in the precipitation of chromic oxide, filtering the hydrated chromic oxide, acid repulping and filtering or calcining the hydrated chromic oxide, followed by water repulp and filtering with displacement washing. The color of the particle can be controlled by the drying temperature. A composite particle of hydrated chromic oxide/carbon can be made by forming a slurry of the aqueous solution of sodium bichromate with powdered carbon. The composite particle can be heated to directly produce chrome metal.

REFERENCES:
patent: 2833645 (1958-05-01), Erasmus
patent: 2850378 (1958-09-01), Cooper
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patent: 3090670 (1963-05-01), Stambaugh
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patent: 4367213 (1983-01-01), Fiorucci
Kurt-Othmar Encyclopedia, vol. 6, p. 107.
Chemical Abstracts, vol. 22 (1928), p. 3745.
Prakash et al., "Basic Chromium Sulfate-A Manufacturing Perspective," Chemical Age India, 32(11), 975-6, (ENG) 1981.

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