Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1977-01-27
1978-04-11
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423 56, 423 58, 423 61, 423593, 423606, 75 97R, 75101R, 75121, 75103, C01G 4100
Patent
active
040839206
ABSTRACT:
A process is provided for extracting tungsten values from tungsten compositions. The process comprises treating a tri (alkaline earth metal) tungstate, especially tricalcium tungstate, at a temperature of preferably no greater than 50.degree. C. with a aqueous solution of hydrochloric and/or nitric acid, preferably having a concentration of no greater than 5 molar. The acid is supplied in excess of te stoichiometric amount required to convert the tungstate to tungstic acid and sufficient to maintain the thusly formed tungstic acid insoluble in the solution. The tungstic acid can then be separated from the solution and converted to soluble ammonium tungstate, which in turn can be converted into tungsten trioxide and finally into metallic tungsten. The tri (alkaline earth metal) tungstate starting material can be prepared from iron tungstate, manganese tungstate, and/or an alkaline earth metal tungstate or from ores or concentrates of these tungstates, by a high temperature treatment with calcium oxide. The tungsten values can be obtained with good yields and low levels of impurities.
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Vezina, et al., "Transactions, Conference of Metallurgists, Ottawa," Aug. 1965, pp. 445-449.
Beaton Stephen Peter
Kasserra Hans Peter
Carter Herbert T.
Du Pont of Canada Limited
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