Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1983-08-02
1984-07-03
Carter, Herbert T.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
423 53, 423 61, 423 87, 423593, C22B 111, C22B 112, C01G 3900, C01G 4100
Patent
active
044577761
ABSTRACT:
A process for the removal of arsenic compounds from tungsten and/or molybdenum concentrates by selective extraction, characterized in that the concentrates are extracted with an aqueous solution of a ferric compound of a pH below 2.5 and a temperature of at least 60.degree. C.
REFERENCES:
patent: 3220796 (1965-11-01), Espinosa
patent: 3674424 (1972-07-01), Stanley et al.
patent: 4242124 (1980-12-01), Makipirtti
Dorfler et al., "Journal of Metals", May 1981, pp. 48-54.
Nieuwhof Arjen
van't Sant Jan P.
Carter Herbert T.
Shell Internationale Research Maatschappij B.V.
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