Process for the preparation of tantalum/niobium hydroxides and o

Details Process for the preparation of tantalum/niobium hydroxides and o Process for the preparation of tantalum/niobium hydroxides and o

1991-08-27

1993-03-16

Morris, Theodore

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vb metal

423 62, 423 63, 423 66, 423 67, C01G 3300, C01G 3500

Patent

active

051942321

ABSTRACT:
Fluorine content of tantalum and niobium hydroxides is reduced to under 0.5 weight % by washing such hydroxide precipitates (as obtained by HF digestion and solvent extraction) with dilute ammonia (1 to 10%) and then water in two washing stages. The first washing stage includes a partial neutralization and the used wash water of the second stage is advantageously recycled, after adjustment of its ammonia concentration, for use as the first stage washing liquid.

REFERENCES:
patent: 3112991 (1963-12-01), Fisher
patent: 4537750 (1985-08-01), Ritsko et al.
patent: 4942024 (1990-06-01), Sasaki et al.
Grant & Hackhs Chemical Dictionary, fifth edition p. 235 (1987).

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