Fluid bed reduction to produce molybdenum metal

Details Fluid bed reduction to produce molybdenum metal Fluid bed reduction to produce molybdenum metal

1985-12-18

1987-04-21

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

266905, C22B 114

Patent

active

046593764

ABSTRACT:
Molybdenum trioxide in granular or powder form is reduced to molybdenum metal by stagewise fluid bed reduction wherein molybdenum trioxide is reduced to molybdenum dioxide using ammonia as the fluidizing-reducing gas at 400.degree. C. to 650.degree. C. and molybdenum dioxide is reduced to metal using hydrogen as the fluidizing-reducing gas at 700.degree. C. to 1400.degree. C. The content of impurities such as lead, zinc, bismuth and copper is reduced during the process.

REFERENCES:
patent: 2783187 (1957-02-01), Odell
patent: 3264098 (1966-08-01), Heytmeijer
patent: 3865573 (1975-02-01), Neumann et al.
Metals Handbook, vol. 2, 8th ed., p. 152, 2/12/74.

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