Nitride process for refining calcium

Details Nitride process for refining calcium Nitride process for refining calcium

1992-05-15

1993-07-13

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

423412, C22B 2620

Patent

active

052269523

ABSTRACT:
A process for refining calcium containing aluminum as an impurity in the form CaAl.sub.2. The calcium is nitrided to form Ca.sub.3 N.sub.2, and that Ca.sub.3 N.sub.2 is made to react with CaAl.sub.2 initially present and with the particulate aluminum in such a manner as to form calcium, which is isolatable in the form of high-purity calcium containing less than 0.1% by weight of aluminum, and aluminum nitride.

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patent: 4765831 (1988-08-01), Cochran et al.
patent: 4769067 (1988-09-01), Cochran et al.
patent: 4812168 (1989-03-01), Cochran et al.

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