Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1988-10-26
1990-04-17
Kastler, S.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75959, C22B 3432
Patent
active
049177265
ABSTRACT:
Waste materials containing chromium, such as the sludge resulting from neutralization of chromic acid bleed streams from metal cleaning and plating operations, are (1) rendered innocuous for land fill purposes by heating to temperatures of at least about 700.degree. C. to stabilize the materials for safe disposal and (2) activated by heating to temperatures of about 400.degree. to 500.degree. and the chromium content in the resulting calcine can be recovered by thermite reduction.
REFERENCES:
patent: 4150975 (1979-04-01), Miyake et al.
patent: 4162294 (1979-07-01), Witzke et al.
patent: 4242127 (1980-12-01), Muller et al.
patent: 4331475 (1982-05-01), Perfect
patent: 4356030 (1982-10-01), Halpin et al.
Beckstead Leo W.
Chou Eddie C. J.
Kucera, Jr. Charles J.
Papafingos Pandelis
Amax Inc.
Ciomek Michael A.
Kalil Eugene J.
Kastler S.
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