Tungsten production from raw materials containing phosphorus imp

Details Tungsten production from raw materials containing phosphorus imp Tungsten production from raw materials containing phosphorus imp

1981-05-28

1982-09-14

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 61, C01G 4100

Patent

active

043495150

ABSTRACT:
A method for producing tungsten compounds low in phophorus. Calcium tungstate is precipitated from a tungstate solution possibly containing phosphate with a calcium compound. The resulting precipitate is reacted with an alkali carbonate solution under pressure of preferably 15 to 25 bar and the solution resulting is separated from the residue containing substantially all of the phosphate. The resulting solution is collected and is suitable for production of tungsten compositions low in phosphorus.

REFERENCES:
patent: 1388857 (1921-08-01), Giles et al.
patent: 1399705 (1921-12-01), Ekeley et al.
patent: 2388306 (1945-06-01), Burwell
patent: 2394362 (1946-02-01), Burwell
patent: 2893832 (1959-07-01), Lowng
patent: 2894814 (1959-07-01), Lowng
patent: 4273745 (1981-06-01), Laferty

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