Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1981-05-07
1982-10-12
Thomas, Earl C.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423 55, 423 58, 423 61, 423593, C01G 4900
Patent
active
043538800
ABSTRACT:
Tungsten is recovered from tungsten ore concentrates in the form of sodium tungstate by a basic process in which ground ore is first digested in a sodium hydroxide solution followed by diluting the solution to dissolve sodium tungstate separating the solution from the caustic insoluble sludge and crystallizing soluble sodium tungstate, wherein the present invention permits improved recovery of tungsten from difficult to process ores by the process steps of drying the insoluble sludge portion, comminuting the dried sludge to a particle size less than about 200 mesh, and dissolving said comminuted sludge in 4.5-5.5 molar NaOH to recover substantially all of the tungsten values.
REFERENCES:
patent: 2339888 (1944-01-01), Smith
patent: 2459868 (1949-01-01), Burwell et al.
patent: 3800025 (1974-03-01), Fox
patent: 3911077 (1975-10-01), Martin et al.
Vezina et al., "A Process for Preparing Tungstic Trioxide of High Purity from a Canadian Scheelite Concentrate", The Canadian Mining and Metallurgical Bulletin, Dec. 1966, pp. 1418-1422.
GTE Products Corporation
Thomas Earl C.
Walter Robert E.
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