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

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

1986-09-05

1988-01-12

Stoll, Robert L.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

423 215, 423 51, 423 52, 423 54, 423 55, 423139, 423147, 423150, 423263, 75 2, 75101R, 75101BE, 75109, 75114, 75115, 75121, C22B 3436, C22B 5900

Patent

active

047189959

ABSTRACT:
A process is disclosed for recovering scandium from a tungsten bearing material containing tungsten, iron manganese and scandium. The process involves digesting the material in an aqueous solution selected from the group consisting of a saturated solution of sulfur dioxide and a sulfuric acid solution containing an additional reducing agent at a sufficient temperature for a sufficient time to form a digestion solution containing the major portion of the scandium, iron, and manganese, and a digestion solid containing the major portion of the tungsten which is separated from the digestion solution. The major portion of the scandium is extracted from the digestion solution with an organic consisting essentially of an extracting agent which is essentially a mixture of alkyl primary amines which are present in an amount sufficient to extract the major portion of the scandium without extracting appreciable amounts of iron and manganese, and the balance an essentially aromatic solvent. After separation of the scandium containing organic from the raffinate, the organic is stripped of the scandium with hydrochloric acid which is then separated from the stripped organic. In an optional additional steps, iron is recovered by adjusting the pH of the raffinate to precipitate the major portion of the iron and manganese which is separated from the resulting liquor. A sufficient amount of chlorine gas is contacted with an aqueous slurry of the precipitate at a sufficient temperature for a sufficient time to form a manganese containing solution containing the major portion of the manganese which was in the precipitate and a solid containing the major portion of the iron which was in the precipitate.

REFERENCES:
patent: 2747965 (1956-05-01), Daugherty
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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