Process for the manufacture of ammonium and alkali metal tungsta

Details Process for the manufacture of ammonium and alkali metal tungsta Process for the manufacture of ammonium and alkali metal tungsta

1977-01-27

1978-04-11

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 53, 423 58, 423 61, 423606, 423593, 75 97R, 75101R, 75103, 75121, C01G 4100

Patent

active

040839222

ABSTRACT:
A process is provided for the manufacture of a tungstate salt, especially ammonium tungstate. The process comprises treating finely divided metallic tungsten and/or intermetallic iron/tungsten species with an aqueous solution in the presence of an oxidizing agent, such as oxygen or hydrogen peroxide. The solution contains cations which are ammonium and/or alkali-metal ions and anions which are hydroxide, carbonate and/or bicarbonate ions. The finely divided material generally contains no more than impurity quantities of alkaline earth metals. The process is useful in deriving tungsten values from wolframite ores, which are reduced prior to the aqueous treatment.

REFERENCES:
patent: 1255144 (1918-02-01), Ekeley et al.
patent: 1388857 (1921-08-01), Giles et al.
patent: 1535019 (1925-04-01), Dorsey
patent: 2992916 (1961-07-01), Newkirk
patent: 3429693 (1969-02-01), Bauer et al.
patent: 3717697 (1973-02-01), Gillchriest

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