Method for preparing high purity vanadium

Details Method for preparing high purity vanadium Method for preparing high purity vanadium

1984-05-16

1986-09-09

Terapane, John F.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 27, 75 65EB, C22B 3422

Patent

active

046107207

ABSTRACT:
A method for preparing high purity vanadium having a low silicon content has been developed. Vanadium pentoxide is reduced with a stoichiometric, or slightly deficient amount of aluminum to produce a vanadium-aluminum alloy containing an excess of oxygen. Silicon is removed by electron-beam melting the alloy under oxidizing conditions to promote the formation of SiO which is volatile at elevated temperatures. Excess oxygen is removed by heating the alloy in the presence of calcium metal to form calcium oxide.

REFERENCES:
patent: 3184302 (1965-05-01), Chindgren
patent: 3288594 (1966-11-01), Smith
patent: 3425826 (1969-02-01), Schmidt et al.
patent: 4169722 (1979-10-01), Fletcher
patent: 4504310 (1985-03-01), Boulier
Gregory et al., "Production of Ductile Vanadium by Calcium Reduction of Vdium Trioxide", J. Electrochemical Society, vol. 98, No. 10, Oct. 1951, pp. 395-399.

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