Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1983-12-01
1984-06-12
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423 53, 423 61, 75 6, C01G 4100
Patent
active
044540981
ABSTRACT:
A process is disclosed wherein tungsten is recovered from hazardous waste material containing said tungsten, arsenic, and other impurities which can consist of magnesium, phosphorus, and silicon and the resulting waste is treated to render it nonhazardous according to EPA standards for arsenic. Said process involves digesting said hazardous waste material in an aqueous solution of an alkali metal hydroxide, adjusting the pH of the resulting solution to about 11.0 to about 13.0 with NaOH to precipitate essentially all of the magnesium and silicon species, filtering the digestion mix to remove the solids from said resulting solution which contains about 80 to about 100% of said tungsten and essentially none of said magnesium and said silicon, slurrying the hazardous solids in hot water, and adding to the slurry a ferric salt solution to precipitate ferric hydroxide, filtering this mixture to give a solid which passes the EPA standard test for solids with respect to arsenic.
REFERENCES:
patent: 2556255 (1951-06-01), Carosella
patent: 2893832 (1959-07-01), Loring
patent: 3674424 (1972-07-01), Stanley et al.
patent: 4420331 (1983-12-01), Sant et al.
MacInnis Martin B.
Miller Michael J.
Scheithauer Richard A.
Vanderpool Clarence D.
Carter Herbert T.
GTE Products Corporation
Walter Robert E.
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