Process for the preparation of finely particulate chromium metal

Details Process for the preparation of finely particulate chromium metal Process for the preparation of finely particulate chromium metal

1987-02-05

1988-08-30

Terapane, John F.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

C22B 3432

Patent

active

047674547

ABSTRACT:
For preparing a chromium metal powder lacking in oxygen and having an average particle size not greater than 20 .mu.m, a mixture of chromium oxide and calcium oxide, in a molar ratio of 1:0.5 to 1:2, is calcined initially at temperatures of 650.degree. to 1,200.degree. C. with access of oxygen up to a weight increase of 1 to 6 g per mole of chromium oxide, the calcined product is comminuted to a particle size not greater than 100 .mu.m and the product so obtained is reduced calciothermally. The calcium oxide can be replaced wholly or partially by calcium carbonate.

REFERENCES:
patent: 2332415 (1943-10-01), Udy
patent: 2854327 (1958-09-01), Perrin et al.
patent: 2889218 (1959-06-01), Hiskey et al.
patent: 3053649 (1962-09-01), Galmiche
patent: 3623861 (1969-08-01), Arias

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