Method of decalcifying rare earth metals formed by the reduction

Details Method of decalcifying rare earth metals formed by the reduction Method of decalcifying rare earth metals formed by the reduction

1988-10-11

1990-04-17

Stoll, Robert L.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

75364, 252 6255, 148301, 148302, 420 83, 420121, B22F 100

Patent

active

049177249

ABSTRACT:
Mixtures of a rare earth and an intermetallic compound comprising the rare earth and a ferromagnetic metal selected from the group consisting of iron and cobalt which are formed by the reduction-diffusion process are decalcified by washing with an aqueous ammoniacal solution comprising a reagent capable of forming a calcium salt soluble in alkaline solution and maintaining the pH of the washing solution above 9.0.

REFERENCES:
patent: 3625779 (1971-12-01), Cech
patent: 3748193 (1973-07-01), Cech
patent: 3912554 (1975-10-01), Arendt et al.
patent: 3918933 (1975-11-01), Martin
patent: 3928089 (1975-12-01), Cech
patent: 4681623 (1987-07-01), Akajima et al.

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