Fluid bed reduction to produce flowable molybdenum metal

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

1992-12-28

1994-07-19

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C22B 3434

Patent

active

053305574

ABSTRACT:
Flowable molybdenum metal powder of controlled particle size distribution is produced by stage-wise reduction wherein, in a first stage, molybdenum trioxide feed is preferably introduced at depth in a fluid bed of molybdenum dioxide and is reduced in an atmosphere containing at least 50% hydrogen, by volume, at a temperature between 560.degree. and 620.degree. C. and the product molybdenum dioxide is then reduced to molybdenum metal in a second stage fluid bed at a temperature between 1025.degree. C. and 1075.degree. C. in an atmosphere containing at least 50% hydrogen employed in amount of at least 2.75 times stoichiometric while controlling the off-gas dewpoint to be at least 21.degree. C. and controlling the off-gas hydrogen:water vapor ratio so as not to exceed 24:1 and removing the product spheroidal molybdenum metal particles from the bottom of the bed to prevent collapse of the bed.

REFERENCES:
patent: 4146388 (1979-03-01), Lafferty et al.
patent: 4659376 (1987-04-01), Carpenter et al.
patent: 5125965 (1992-06-01), Sebenik

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