Electron-beam melt refining of ferroniobium

Details Electron-beam melt refining of ferroniobium Electron-beam melt refining of ferroniobium

1998-02-27

1999-12-28

Willis, Prince

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 1015, 75 1046, 75 1048, 75 105, 75401, 423 62, C21B 1110, C22B 100, C01G 3100

Patent

active

06007597&

ABSTRACT:
Niobium, Nb, is refined from FeNb by electron beam melt refining. The amount of the impurities in the FeNb which form suboxides with oxygen is optionally determined. Sufficient oxygen is added to form oxides with these impurities. The electron beam melt refining process is carried out at a sufficiently high temperature and under a sufficiently low vacuum so that the impurities are removed as oxides from the liquid Nb and the purified Nb is recovered. Preferably the oxygen is added as an oxygen-containing compound such as Nb.sub.2 O.sub.5. The recovered Nb can be subjected to additional electron beam melt refining cycles to obtain the desired purity.

REFERENCES:
patent: 4610720 (1986-09-01), Schmidt et al.
patent: 4720300 (1988-01-01), Nishizawa et al.
patent: 5284639 (1994-02-01), Sommers et al.

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