Proces for the production of rare earth metals and alloys

Details Proces for the production of rare earth metals and alloys Proces for the production of rare earth metals and alloys

1987-08-19

1988-11-22

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 84, C22B 400, C21C 552

Patent

active

047863196

ABSTRACT:
The invention relates to a process for the production of rare earth metals and alloys thereof. The process exploits the known advantages of metallothermal reduction techniques while decisively enhancing their reduction process. Rare earth halides and/or rare earth oxides are reduced in an electric arc furnace by means of one or several alkaline earth metals, preferably, calcium. Additives such as iron metals or other alloying elements, alkali- and/or alkaline earth metal salt, may be added to the electric arc furnace in a two-phase furnace operation. The reduction takes place in an atmosphere inert to rare earth metals, rare earth compounds, and alkaine earth metals. Agitation is produced in the metal in the furnace by eletromagnetic forces caused by a suitably selected current-to-voltage ratio for the electric arc, in order to achieve reduction in the shortest possible time and as completely as possible.

REFERENCES:
patent: 4177059 (1979-12-01), Day
patent: 4197422 (1980-04-01), Fuchs et al.
Ullmann Encyclopedia, vol. 21, pp. 260/1.

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