Deprotonation of an alkylphenyl acid phosphate extractant

Details Deprotonation of an alkylphenyl acid phosphate extractant Deprotonation of an alkylphenyl acid phosphate extractant

1979-08-31

1982-04-20

Kyle, Deborah L.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

C01G 4300, C01B 25237

Patent

active

043259189

ABSTRACT:
Uranium in wet-process phosphoric acid in the tetravalent state is extracted with an alkylphenyl acid phosphate extractant. The uranium in the pregnant extractant is then oxidized to the hexavalent state and stripped with a phosphoric acid stripping solution. Hydrolysis of the extractant is decreased by decreasing the proton concentration of the extractant which results from acidic impurities, e.g., sulfuric acid and fluorosilicic acid, originally present in the wet-process phosphoric acid. The proton concentration of the extractant is reduced indirectly by treating the phosphoric acid strip solution (1) with reagents which react with the acidic impurities to form water and an insoluble precipitate which is removed from the stripping solution; (2) with reagents to neutralize the acidic impurities in the stripping solution; or (3) by passing the stripping solution through a suitable ion exchange column.

REFERENCES:
patent: 3835214 (1974-09-01), Hurst et al.
Bailes et al., "Liquid-Liquid Extraction: Metals" Chemical Engineering, (Aug. 30, 1976) pp. 86-94.
Deleon et al., "Possibilities for Recovery of Uranium . . .", IAEA-SM-135/39 pp, 351-361.
Hurst et al., "Recovery of Uranium from Wet-Process Phosphoric Acid . . .", Ind. Eng. Chem. Process Des. Develop. 13(3) (1974) pp. 286-291.
Hurst, "Recovery of Uranium . . .", CONF-760203-1 (1976).

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