Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1983-12-01
1984-05-15
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423 54, 423 53, 423 58, 423593, C01G 4100
Patent
active
044487550
ABSTRACT:
In a process for producing pure ammonium paratungstate from ammonium tungstate solutions containing tin, sulfide is added to the ammonium tungstate solution in an amount sufficient to form a soluble complex of the sulfide with the tin. The solution is then evaporated to a volume at which essentially all of the tungsten is in the form of insoluble ammonium paratungstate and essentially all of the tin is in the mother liquor in the form of a soluble complex along with other impurities. The solid ammonium paratungstate is then separated from the mother liquor by filtration.
REFERENCES:
patent: 1431559 (1922-10-01), Becket
patent: 4346061 (1982-08-01), Goddard
Christini James N.
MacInnis Martin B.
Miller Michael J.
Scheithauer Richard A.
Vogt Martin C.
Carter Herbert T.
GTE Products Corporation
Walter Robert E.
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