Process for preparing ammonium tungstates

Details Process for preparing ammonium tungstates Process for preparing ammonium tungstates

1977-01-27

1978-03-21

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 53, 423 56, 423606, 423593, 75103, 75121, 75 97R, C01G 4100

Patent

active

040804216

ABSTRACT:
A process is provided for preparing ammonium tungstate. In the process, a reduced calcium tungstate is treated in the presence of an oxidizing agent with an aqueous solution having at least ammonium cations and carbonate and/or bicarbonate anions, at a temperature of 10.degree. C to the boiling point of the solution. The reduced calcium tungstate reacts with the ammonium cations to form the ammonium tungstate which is soluble in the solution and with the anions to form a calcium compound which is insoluble in the solution. Oxygen and/or hydrogen peroxide are preferred oxidizing agents. The process is especially useful in separating tungsten values from scheelite ores or concentrates.

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.
Vezina et al., "Transactions Conference of Metallurgists Ottawa," Aug. 1965, pp. 445-449.

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