Autoclave soda digestion of scheelite concentrates with feedback

Details Autoclave soda digestion of scheelite concentrates with feedback Autoclave soda digestion of scheelite concentrates with feedback

1981-01-19

1982-04-20

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 53, 423DIG5, C01G 4100

Patent

active

043259197

ABSTRACT:
A continuous process with feedback control is disclosed for the soda ash digestion of tungsten concentrates in which a slurry of the concentrate in an aqueous sodium carbonate solution is digested in an autoclave at a temperature of at least about 180.degree. C. to provide a pregnant solution of WO.sub.3. High dissolution efficiency is maintained during digestion by continuously monitoring the pregnant solution which includes determining the specific gravity and the Na.sub.2 CO.sub.3 concentration of the pregnant liquor from which feedback signals are produced which are used to control the amount of Na.sub.2 CO.sub.3 and H.sub.2 O fed to the slurry in accordance with the digestion conditions predetermined to provide the desired dissolution efficiency.

REFERENCES:
patent: 2351678 (1944-06-01), Hall
patent: 2927871 (1960-03-01), Maniki et al.
patent: 3429693 (1969-02-01), Bauer et al.
patent: 4092400 (1978-05-01), Zbranek et al.
patent: 4167555 (1979-09-01), Gomes et al.
Grigorin et al., "Chemical Absts.", vol. 61, 1964, #9209a.
Zelikman et al., "Chemical Absts.", vol. 89, 1978, #133099p.

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