Removal of carbonate from caustic sulfide solution

Details Removal of carbonate from caustic sulfide solution Removal of carbonate from caustic sulfide solution

1991-07-01

1992-11-17

Morris, Theodore

Chemistry of inorganic compounds

Carbon or compound thereof

Oxygen containing

423165, 423158, 423 55, 423431, C01F 524

Patent

active

051641712

ABSTRACT:
In the manufacture of ammonium paratungstate, sulfide is added to a tungsten-containing solution in order to precipitate molybdenum sulfide. Volatiles, including sulfides, evolved during this process are collected in a caustic scrubbing solution. The sulfide values in the caustic scrubbing solution may be reused to precipitate molybdenum sulfide by first treating the caustic scrubbing solution with alkaline earth chloride or sulfate to precipitate out alkaline earth carbonate.

REFERENCES:
patent: 3041135 (1962-06-01), Chittum
patent: 3471249 (1969-10-01), Markant et al.
patent: 3941875 (1976-03-01), Tsuruta et al.
patent: 3996335 (1976-12-01), Wolk et al.
patent: 4035166 (1977-07-01), Van Hecke

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