Determination of optimum process conditions for the separation of thorium and rare earth elements by solvent extraction

Nasab, M. Eskandari; Sam, Abbas; Milani, S.

doi:10.1016/j.hydromet.2010.12.014

Cited by 95 publications

(43 citation statements)

References 12 publications

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“…For instance, Eskandari Nasab et al 30 reported that Th (IV) was extracted from 0.01 M nitric acid solution by Cyanex 272 in kerosene. Also, the extraction of Th (IV) from aqueous sulphuric acid medium with a synergistic mixture of N-n-octylaniline and trioctylamine (TOA) in xylene was investigated by Patkar et al 31 According to Borai et al, 32 in sulfate medium, thorium is extracted preferably by primary amines.…”

Section: Effect Of Contact Timementioning

confidence: 99%

Subsequent separation and selective extraction of thorium (IV), iron (III), zirconium (IV) and cerium (III) from aqueous sulfate medium

et al. 2016

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Regarding to their presence as an important constituent in some ores such as monazite, this work aims for selective solvent extraction of thorium (IV), zirconium (IV), iron (III) and cerium (III) from aqueous sulfate medium using different basic and acidic extractants. To elucidate the extractability of these elements, different effective parameters were studied such as contact time, pH value, extractant concentration and the diluents type. In a single element system, Th (IV) was extracted by the primary amines (octylamine and tert.octylamine) and the acidic extractnts [di-(2-ethylhexyl) phosphoric acid (D2EHPA) and (bis(2,4,4-trimethyl pentyl) phosphinic acid (Cyanex 272))]. Moreover, secondary amine (N-methylaniline) is effective for Fe (III) extraction while, the primary amines are suitable for Zr (IV) extraction. Ce (III) can be extracted with the primary amines and D2EHPA. In a mixed elements system, Th (IV) was extracted firstly with Cyanex 272 (65 %) at pH 1 followed by the extraction of Fe (III) with N-methylaniline (95 %), then Zr (IV) was precipitated at pH 2.5 (84 %) while Ce (III) remains in the final aqueous phase.

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Section: Effect Of Contact Timementioning

confidence: 99%

Subsequent separation and selective extraction of thorium (IV), iron (III), zirconium (IV) and cerium (III) from aqueous sulfate medium

et al. 2016

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“…monazite and bastnaesite minerals [1]. Since lanthanides are essential elements in modern technology, a separation technique to remove Th and U from lanthanides is important not only in terms of environmental restoration but also in hydrometallurgy and nuclear fuel treatments [2]. Among the methods that have been proposed for the extraction and recovery of these elements, solid phase extraction with the use of an adsorbent has advantages because of its ability to address low metal and pollutant concentrations, e.g.…”

Section: Introductionmentioning

confidence: 99%

Solid Phase Extraction of Thorium and Uranium and their Separation from Lanthanides using Humic Acid Silica Gel as a Low-Cost Adsorbent

Prasetyo

Toyoda

2017

J. Eng. Technol. Sci.

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Abstract. Solid phase extraction and separation of thorium (Th), uranium (U) and lanthanides were achieved using a humic acid-modified silica gel (Si-HA). Adsorption capacity, effect of contact time, pH, and adsorbent dose were examined at room temperature. The maximum adsorbent capacities (pH = 3) for Th and U were 28.0 and 31.3 mg g -1 , respectively. The isotherm parameters denoted that the adsorption was favorable and optimum conditions were attained within 90 min. The kinetic data conformed well to pseudo-second order and intra-particle diffusion models. The distribution coefficients of U, Th and lanthanides in EDTA, citric acid and nitric acid media signify the possible separation of each element from the others. The salinity did not significantly affect the ability of Si-HA to extract Th and U. The adsorbent stability and reusability were also assessed through four-adsorption-desorption cycles. The simplicity of the proposed separation method along with the stability of the adsorbent and high regeneration efficiency under acidic conditions demonstrated the merit of using Si-HA as a low-cost adsorbent.

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“…For the former, several techniques such as solvent extraction, [16][17][18] extraction chromatography 19 and ionexchange 20 can be used for the removal of thorium matrix for the precise analysis of trace FPs. Thereinto, due to the generation of a large volume of organic radioactive waste in solvent extraction and the short term stability in extraction chromatography, the ion exchange with favorable selectivity and stability has been extensively studied for the removal of thorium matrix dissolved in HNO3 medium.…”

Section: Introductionmentioning

confidence: 99%

Determination of Trace Fission Products Associated with Thorium and HCl Matrix by Inductively Coupled Plasma Mass Spectrometry after Anion Exchange Separation

Chen

Zheng

et al. 2017

ANAL. SCI.

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For the determination of μg-mg L -1 of FPs in 100 g L -1 of thorium matrix with HCl medium, a method, including anionexchange pre-separation, evaporation and inductively coupled plasma mass spectrometry (ICP-MS) measurement, was developed. The procedure parameters, such as the matrix effect of thorium, the acidity of separation, the elution curve of thorium and FPs and the temperature of evaporation were optimized by batch equilibration, column elution and evaporation experiments. It was found that the average recovery of the FPs was in the range 80 -110%, and the RSD values were in the range 2 -15% utilizing prior anion exchange separation of FPs from thorium samples. Furthermore, the detection limit of the method was also investigated.

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Determination of optimum process conditions for the separation of thorium and rare earth elements by solvent extraction

Cited by 95 publications

References 12 publications

Subsequent separation and selective extraction of thorium (IV), iron (III), zirconium (IV) and cerium (III) from aqueous sulfate medium

Subsequent separation and selective extraction of thorium (IV), iron (III), zirconium (IV) and cerium (III) from aqueous sulfate medium

Solid Phase Extraction of Thorium and Uranium and their Separation from Lanthanides using Humic Acid Silica Gel as a Low-Cost Adsorbent

Determination of Trace Fission Products Associated with Thorium and HCl Matrix by Inductively Coupled Plasma Mass Spectrometry after Anion Exchange Separation

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