Combined autoclave soda digestion of wolframite and scheelite

Details Combined autoclave soda digestion of wolframite and scheelite Combined autoclave soda digestion of wolframite and scheelite

1981-01-19

1982-03-16

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 53, 423 58, C01G 4100

Patent

active

043200966

ABSTRACT:
A process for the soda digestion of mixed wolframite and scheelite concentrates is provided, the process comprising forming a slurry of the mixed wolframite and scheelite concentrates in an aqueous sodium carbonate solution and then digesting the slurry in an autoclave at a temperature of at least about 180.degree. C. During digestion a predetermined amount of sodium hydroxide is added calculated stoichiometrically to react with NaHCO.sub.3 formed as a result of the hydrolysis of FeCO.sub.3 or FeCO.sub.3 and MnCO.sub.3 produced during the digestion of the wolframite and convert it to Na.sub.2 CO.sub.3. The concentration of the Na.sub.2 CO.sub.3 solution is substantially inversely correlated to the digestion temperature and substantially directly correlated to the Na.sub.2 CO.sub.3 /WO.sub.3 weight ratio ranging from about 0.9 to 2 such as to effect dissolution of at least about 95% of the WO.sub.3 in the concentrate and provide a pregnant liquor containing said WO.sub.3.

REFERENCES:
patent: 2351678 (1944-06-01), Hall
patent: 3429693 (1969-02-01), Bauer et al.
patent: 4092400 (1978-05-01), Zbranek et al.
patent: 4167555 (1979-09-01), Gomes et al.
Grigoriu et al., "Chemical Absts.", vol. 61, 1964, #9209a.
Naser, "Chemical Absts.", vol. 61, 1964, #5251a.
Zelikmann et al., "Chemical Absts.", vol. 89, 1978, #133090p.

Affiliated with

Also associated with

Rating

Combined autoclave soda digestion of wolframite and scheelite does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Combined autoclave soda digestion of wolframite and scheelite, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Combined autoclave soda digestion of wolframite and scheelite will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1641597