Liquid-liquid extraction of Th4+ and UO 2 2+ by LIX-26 and its mixtures

Singh, Suman Kumar; Panda, C. S.; Chakravortty, V.; Dash, K. C.

doi:10.1007/bf02037851

Cited by 12 publications

(1 citation statement)

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“…Mixtures of 8-hydroxyquinoline or its derivatives and neutral donors have been found to produce synergism in the extraction of different metal ions by adduct formation in the extracted complex [8,9]. Studies on the extraction of uranium(VI) and thorium(IV) [10] and some selected metals [ 11 ] by LIX 26 (an alkylated 8-hydroxyquinoline derivative) have recently been reported. It was of interest, therefore, to study the extraction of zirconium(IV) from diluted acid solution (to prevent hydrolysis) containing thiocyanates by LIX 26 and by mixtures of LIX 26 and dioctyl sulphoxide, DOSO (a neutral donor) in order to investigate the phenomenon of synergism or antagonism as the case may be.…”

Section: Introductionmentioning

confidence: 99%

Solvent Extraction of Zirconium (IV) from Thiocyanate and Hydrochloric Acid Solutions by LIX 26 and DOSO

Mishra¹,

Chakravortty²,

Dash³

et al. 1989

Radiochimica Acta

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Solvent extraction of zirconium (IV) from dil. HCl media by 5% (v/v) LIX 26 result in maximum extraction at 1 M HCl. Presence of thiocyanate ions greatly increase the extent of extraction from dil. HCl solutions. Synergism has been observed in the extraction of this metal ion by mixture of LIX 26 and dioctyl sulphoxide (DOSO) from both dil. HCl solutions and thiocyanate media. The plot of logD vs. log [DOSO] for the extraction of zirconium(IV) from 0.5 M HCl indicates the species extracted to be monosolvate in DOSO. The extraction has also been found to increase with increase in the % ( v/v) LIX 26. Increase of metal ion concentration decreases the distribution ratio value significantly in case of extraction from dil. HCl media.

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Section: Introductionmentioning

confidence: 99%

Solvent Extraction of Zirconium (IV) from Thiocyanate and Hydrochloric Acid Solutions by LIX 26 and DOSO

Mishra¹,

Chakravortty²,

Dash³

et al. 1989

Radiochimica Acta

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Temperature‐induced surfactant‐ mediated pre‐concentration of uranium assisted by complexation

Favre‐Réguillon

Murat

Cote

et al. 2006

J of Chemical Tech & Biotech

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Cloud-point extraction (CPE) was used with lipophilic chelating agent to extract uranium(VI) from aqueous solutions. The methodology used is based on the formation of metal complexes soluble in a micellar phase of a non-ionic surfactant, Triton X-114. The metal ions complexes are then extracted into the surfactant-rich phase at a temperature above the cloud-point temperature. The influence of surfactant concentration on extraction efficiency was studied and the advantage of adding 8-hydroxyquinoline (8HQ) as lipophilic chelating agent was evidenced. High extraction efficiency was observed, indicating the feasibility of extracting U(VI) using CPE. This study describes a four-step process -(1) extraction, (2) thermo-induced phase splitting, (3) back-extraction and (4) second phase splitting -for the recovery of uranium from water. In our conditions, the extraction yield is quantitative and the concentration factor obtained is superior to 100. After stripping with a diluted nitric acid solution (pH < 1), the system can be recycled through a new four-step cycle.

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