Recovery of tungsten, scandium, iron, and manganese from tungste

Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Rare earth metal

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423 215, 423 49, 423 53, 423 54, 423139, 423150, 75 2, 75101R, 75101BE, 75121, C01G 4100

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active

048083844

ABSTRACT:
A process is disclosed for recovering tungsten, iron, and manganese from tungsten bearing material. The process involves digesting the material in a sufficient amount of sulfuric acid at a temperature of at least about 80.degree. C. for a sufficient time in the presence of coal as a reducing agent to form a digestion solution containing the major portion of the scandium, iron, and manganese and a digestion residue containing the major portion of the tungsten, followed by separating the solution from the residue. The major portion of the scandium can be extracted from the digestion solution with an organic solution consisting essentially of a mixture of tertiary alkyl primary amines which are present in an amount sufficient to extract the major portion of the scandium, and the balance an essentially aromatic solvent. The scandium is stripped from the organic with hydrochloric acid which is then separated from the stripped organic. The extraction can be accomplished by an organic solution consisting essentially of an extracting agent which is a dialkyl phosphoric acid and an essentially aromatic solvent. In this latter case, the stripping agent for the scandium is an aqueous solution of ammonium carbonate.

REFERENCES:
patent: 4028463 (1977-06-01), Stauter
patent: 4624703 (1986-11-01), Vanderpool et al.
patent: 4626280 (1986-12-01), Vanderpool et al.

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