Niobium powder and a process for the production of niobium and/o

Details Niobium powder and a process for the production of niobium and/o Niobium powder and a process for the production of niobium and/o

1999-09-21

2000-10-24

Mai, Ngoclan

Specialized metallurgical processes, compositions for use therei

Processes

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

75622, 75228, 75368, B22F 100

Patent

active

061360627

ABSTRACT:
The process comprises the reduction of niobium and/or tantalum oxides by means of alkaline earth metals and/or rare earth metals, wherein the first reduction stage is carried out as far as an average composition corresponding to (Nb, Ta)O.sub.x where x=0.5 to 1.5 and before the second stage the reduction product from the first stage is freed from alkaline earth oxides and/or rare earth metal oxides which are formed (and optionally from excess alkaline earth metal and/or rare earth metal) by washing with mineral acids.

REFERENCES:
patent: 1728941 (1929-09-01), Rich et al.
patent: 2516863 (1950-08-01), Gardner
patent: 3647420 (1972-03-01), Restelli
patent: 4684399 (1987-08-01), Bergman et al.
patent: 4687632 (1987-08-01), Hurd et al.
patent: 4722756 (1988-02-01), Hard

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