Reclamation of tungsten values from tungsten-thoria

Details Reclamation of tungsten values from tungsten-thoria Reclamation of tungsten values from tungsten-thoria

1997-05-30

1998-10-06

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

423 61, C22B 6000, C22B 3430, C01G 4100

Patent

active

058191585

ABSTRACT:
A simple, cost effective method for reclaiming tungsten values from tungsten-thoria has been invented. The method involves reacting the tungsten-thoria with molten sodium hydroxide to form a soluble sodium tungstate and an insoluble residue of thoria, cooling the melt, dissolving the melt in water, and filtering to separate the insoluble residue of thoria from the dissolved sodium tungstate. The method resulting in substantially all of the tungsten values being reclaimed as sodium tungstate and acutely reducing the amount of radioactive material for disposal.

REFERENCES:
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patent: 4320094 (1982-03-01), Menashi et al.
patent: 4603043 (1986-07-01), Douglas et al.
patent: 4966760 (1990-10-01), Ladd et al.
K.C. Li, Tungsten: Its History, Geology, Ore-Dressing, Metallurgy, Chemistry, Analysis, Applications and Economics, Chapter IV, pp. 166-184, 209-212, 265-269, Third Ed. (1955) no month,

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