Role of vanadium(V) in the aging of the organic phase in the extraction of uranium(VI) by Alamine 336 from acidic sulfate leach liquors

Conference · Tue Jul 01 04:00:00 EDT 2008

OSTI ID:21230352

Chagnes, A; Cote, G ^[1]; Courtaud, B; Thiry, J ^[2]

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1. Ecole Nationale Superieure de Chimie de Paris - ENSCP Universite Pierre et Marie Curie - Paris 6 - Laboratoire d'Electrochimie et de Chimie Analytique - UMR 7575 CNRS-ENSCP-Paris 6 ENSCP, 11 Rue Pierre et Marie Curie, 75231 Paris Cedex 05 (France)
2. AREVA-NC, Service d'Etudes de Procedes et d'Analyses (SEPA), B.P. No 71, 87250 Bessines sur Gartempe (France)

The present work is focussed on the chemical degradation of Alamine 336-tridecanol-n-dodecane solvent which used in the recovery of uranium by solvent extraction. Degradation occurs due to the presence of vanadium(V), an oxidant, in the feed solution. After a brief overview of the chemistry of vanadium, the kinetics of degradation of the solvent when contacted with acidic sulfate leach liquor was investigated and interpreted by the Michelis-Menten mechanism. GCMS analyses evidenced the presence of tridecanoic acid and dioctylamine as degradation products. A mechanism of degradation is discussed. (authors)

• Research Organization: Chemical Sciences Division, Oak Ridge National Laboratory (United States)
• OSTI ID: 21230352
• Country of Publication: United States
• Language: English

Related Subjects

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
ALKANES
KINETICS
LEACHING
OXIDIZERS
SOLVENT EXTRACTION
SOLVENTS
SULFATES
URANIUM
VANADIUM