Separation of zirconium-hafnium by nitride precipitation

Details Separation of zirconium-hafnium by nitride precipitation Separation of zirconium-hafnium by nitride precipitation

1974-10-24

1977-07-19

Sebastian, Leland A.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

423 3, 423 69, 423 73, C22B 3400, C01G 2300, C01G 5600

Patent

active

040366375

ABSTRACT:
A method for the separation of a light reactive metal (e.g., zirconium) from a heavy reactive metal (e.g., hafnium) by forming insoluble nitrides of the metals in a molten metal solvent (e.g., copper) inert to nitrogen and having a suitable density for the light metal nitride to form a separate phase in the upper portion of the solvent and for the heavy metal nitride to form a separate phase in the lower portion of the solvent. Nitriding is performed by maintaining a nitrogen-containing atmosphere over the bath. The light and heavy metals may be an oxide mixture and carbothermically reduced to metal form in the same bath used for nitriding. The nitrides are then separately removed and decomposed to form the desired separate metals.

REFERENCES:
patent: 1580650 (1926-04-01), Coster
patent: 2793107 (1957-05-01), Jazwinski
patent: 3268302 (1966-08-01), Renner
patent: 3794482 (1974-02-01), Anderson et al.
patent: 3857919 (1974-12-01), Hazen et al.

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