Process for chloride removal from sponge metal

Details Process for chloride removal from sponge metal Process for chloride removal from sponge metal

1991-02-08

1991-11-05

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75611, 75612, 75618, C22B 3414

Patent

active

050628879

ABSTRACT:
A sponge refractory metal product, especially a zirconium metal sponge, that retains a residual quantity of magnesium chloride following subjection to an initial, conventional, distillation cycle is reprocessed by the addition of virgin magnesium in amount normally within the range of about 20% to about 60% of the weight of such sponge metal product and by passing it through re-distillation, including the steps of melting the added virgin magnesium and the sponge metal to open the otherwise closed pores thereof, lowering furnace temperature to solidify the molten magnesium, raising the temperature to vaporize and remove from the furnace the magnesium metal, and again raising the temperature to vaporize and remove from the furnace the initially entrapped magnesium chloride. Thereafter, it is preferable that the temperature be again raised to sinter together any loose particles of the sponge metal. It is believed that a eutectic of the sponge metal is formed during the process.

REFERENCES:
patent: 4711664 (1987-12-01), Kwon et al.

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