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Recent studies of uranium recovery from wet-process phosphoric acid with octylphenyl acid phosphate [electronic resource]

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Bibliographic Details
Online Access: Online Access
Corporate Author: Oak Ridge National Laboratory (Researcher)
Format: Government Document Electronic eBook
Language:English
Published: Oak Ridge, Tenn. : Oak Ridge, Tenn. : Oak Ridge National Laboratory. ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1978.
Subjects:
Solvolysis.
Organic Phosphorus Compounds.
Organic Compounds.
Chemical Composition.
Solvent Properties.
Separation Processes.
Phosphoric Acid.
Extraction.
Transition Element Compounds.
Hydrolysis.
Elements.
Uranium.
Actinides.
Esters.
Metals.
Iron Compounds.
Inorganic Acids.
Lysis.
Impurities.
Decomposition.
Chromatography.
Chemical Reactions.
Crystallization.
Phosphoric Acid Esters.
Stability.
Solvent Extraction.
Phase Transformations.
Hydrogen Compounds.
Nuclear Fuel Cycle And Fuel Materials.
Inorganic, Organic, Physical And Analytical Chemistry.
Description
Abstract:Commercial OPAP is a complex mixture that contains at least 11 components. Octyl phenol is the principal impurity. Commercial OPAP contains readily-hydrolyzable material. The concentrations of octyl phenol and an unidentified impurity increase in the hydrolyzed product. Uranium extraction power is decreased slightly by hydrolysis of the reagent. Four major problems were encountered in continuous stability tests: (1) Microemulsion or micelle formation--loss of organic phase into phosphoric acid. We do not have a solution to this problem at this time. It could involve alteration of the organic, e.g., adding a modifier, changing the reagent structure, or changing the diluent. (2) Reagent poisoning--reduction of uranium extraction and interference with organic titrations by material extracted from the acid. Additional work is needed to identify the poisoning material or materials. It can then be removed if it originates in the phosphate rock, or avoided if it originates in chemicals added during processing. (3) Crystallization with iron--loss of both major components of the reagent as a complex with ferric iron. We believe this problem can be controlled by controlling the ferric iron concentration in the phosphoric acid. (4) MOPPA distribution loss--a selective loss to the aqueous phase. We believe this can be minimized by controlling the iron concentration of the phosphoric acid. The iron concentration will need to be kept low enough to avoid reagent crystallization and high enough to avoid MOPPA distribution loss. 15 figs.
Item Description:Published through the Information Bridge: DOE Scientific and Technical Information.
01/01/1978.
"conf-780902-14"
American Chemical Society meeting, Miami, FL, USA, 10 Sep 1978.
Arnold, W.D.
Physical Description:Pages: 26 : digital, PDF file.

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