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

Details Recovery of tungsten, scandium, iron, and manganese values from Recovery of tungsten, scandium, iron, and manganese values from

1986-09-04

1988-01-12

Stoll, Robert L.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

75 2, 75101R, 75101BE, 75109, 75114, 75115, 75121, 423 215, 423 49, 423 54, 423 55, 423140, 423150, 423263, C22B 3436, C22B 5900

Patent

active

047189967

ABSTRACT:
A process is disclosed for recovering tungsten, scandium, iron, and manganese from tungsten bearing material. The process involves digesting the material in sufficient sulfuric acid at a sufficient temperature for a sufficient time in the presence of 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, separating the digestion solution from the digestion residue and extracting essentially all of the scandium from the solution with an organic consisting essentially of an extracting agent which is a dialkyl phosphoric acid which is present in an amount sufficient to extract essentially all of the scandium without extracting appreciable amounts of iron and manganese, and the balance an essentially aromatic solvent. The scandium containing organic is removed from the raffinate and stripped of the scandium with an aqueous ammonium carbonate solution which is separated from the stripped organic. The pH of the raffinate is adjusted to at least about 2 with a base and electrolyzed to remove the major portion of the iron as iron powder, which is separated from the resulting electrolyzed solution which contains the major portion of the manganese.

REFERENCES:
patent: 3582290 (1971-06-01), Grinstead
patent: 4016237 (1977-04-01), Mason et al.
patent: 4624703 (1986-11-01), Vanderpool et al.
patent: 4626280 (1986-12-01), Vanderpool et al.

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