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Synergistic extraction and separation of thorium from rare earths in chloride media using mixture of Cextrant 230 and cyanex 923

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Journal of Rare Earths 2024年第4期42卷 759-767页

作者： Hui Wang Shengting Kuang Wuping Liao School of Rare Earths University of Science and Technology of ChinaHefei230026China Institute of Material and Chemistry Ganjiang Innovation AcademyChinese Academy of SciencesGanzhou341000China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China

In order to lower the usage of expensive cyanex 923 and increase the extraction capacity of the system of Cextrant 230,the synergistic extraction of thorium from chloride media by a mixture of Cextrant 230 and cyanex 923 was *** maximum synergistic enhancement coefficient(R)of 1.53 is obtained at 1:1 molar ratio of Cextrant 230/cyanex *** syne rgistic extracted species of Th^(4+)is determined as ThCl_(4)·2Cextrant 230·cyanex *** synergistic extraction of Th^(4+)is an entropy-driven exothermic *** loading capacity of 0.60 mol/L mixed extractant for thorium is about 17.10 g/L(calculated as ThO_(2)),and the loaded thorium in the organic phase can be effectively stripped by distilled *** comparison,rare earth cations are barely extracted under the similar conditions,suggesting that the mixtures can be applied to separate thorium from rare earths.A cascade extraction process was developed based on the synergistic extraction system to separate thorium from the hydrochloric acid leaching of *** content of thorium in the leaching solution decreases obviously from 19.90 mg/L to1.4μg/L by 3 stages of extraction,which is superior to sole Cextrant 230 or cyanex *** introduction of Cextrant 230 into the extraction system not only lowers the usage of cyanex 923 but also enhances the selective extraction of thorium at low acidity,implying that the synergistic extraction system can selectively extract thorium more efficiently and economically than the sole systems.

关键词： Synergistic extraction Cextrant 230 cyanex 923 Thorium Rare earths

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Germanium transport across supported liquid membrane with cyanex 923: Mathematical modeling

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Transactions of Nonferrous Metals Society of China 2019年第9期29卷 1956-1966页

作者： Hossein KAMRAN HAGHIGHI Mehdi IRANNAJAD Ana MARIA SASTRE Department of Mining and Metallurgical Engineering Amirkabir University of TechnologyTehranIran Department of Chemical Engineering Universitat Politècnica de CatalunyaESTEIBAv.Diagonal 64708028 BarcelonaSpain

A mathematical model was developed to monitor the facilitated transport of germanium(IV) from oxalic acid solutions through a flat sheet supported liquid membrane(FSSLM) containing four trialkylphosphine oxides(cyanex 923). The FSSLM modeling was based on the extraction constant(Kext) calculated from the liquid-liquid extraction(LLX) modeling. The LLX model presented a reliable calculation of the extraction constant(Kex= 2.057×103 L/mol4). The FSSLM model was solved using Matlab■ software according to extraction constant, Fick’s law, and diffusional principles. The model predicts the overall mass transfer coefficient(Korg) to be 3.84 cm/s. Using this value, diffusion coefficients(Dm) for various cyanex 923 concentrations of 0.126, 0.252, 0.378, 0.505, 0.631 and 0.757 mol/L are found to be 8.50×10^-4, 4.30×10^-4, 1.87×10^-4, 5.87×10^-5, 2.57×10^-5, 2.09×10^-5 cm2/s, respectively. The results show that the diffusion rate of the current study is approximately more than that of similar FSSLM systems containing cyanex 923 used to transport various metals. The modeling values are in good agreement with the experimental data, showing the good reliability of the mathematical model.

关键词： supported liquid membrane cyanex 923 germanium transport mathematical modeling

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Kinetic Study of Ce^(4+)Extraction with cyanex 923

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Journal of Rare Earths 2001年第4期19卷 250-254页

作者：于桂红乐善堂李德谦凤优游 Changchun Inst. of Appl. Chem. Chinese Acad. of Sci. Changchun 130022 China

Ce 4+ extraction rate from aqueous sulphate solutions by cyanex923 in heptane was studied using a constant interfacial cell with laminar flow at 30 ℃. The experimental hydrodynamic conditions were chosen and the contribution of diffusion to the measured rate of reaction was minimized. Cerium extraction rate was measured at different chemical composition by varying the concentrations of hydrogen ion, sulphate and cyanex923. A cerium cyanex923(B) extractive is formed at the interface. The data were analyszed in terms of pseudo first order constants and a reaction mechanism was developed.

关键词： rare earths extraction kinetics Ce 4+ cyanex 923

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Thermodynamic and application study of complicated extraction system Ce(Ⅳ)-HF-H_(3)BO_(3)-H_(2)SO_(4) using cyanex 923

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Journal of Rare Earths 2021年第9期39卷 1117-1125页

作者： Dan Zou Haitian Li Ji Chen Deqian Li State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou 014030China State Key Laboratory of Rare Earth Resources Utilization Changchun Institute of Applied Chemiscry Chinese Academy of SciencesChangchun 130022.China

This article aims to reduce the environmental pollution while maximizing the recovery of REEs as well as associate resource-fluorine(F)from *** paper investigates the extraction equilibrium process and mechanism of Ce(Ⅳ)-HF-H_(3)BO_(3)-H_(2)SO_(4)system using cyanex *** equilibrium process of different systems,including HF-H_(2)SO_(4),H_(3)BO_(3)-HF-H_(2)SO_(4),and Ce(Ⅳ)-HF-H_(2)SO_(4),were studied in detail and the corresponding extraction mechanisms were also *** is noteworthy that a synergistic effect between B-F and an antagonistic effect between Ce(Ⅳ)-F were discovered first in the extraction process by cyanex ***,H_(3)BO_(3)is found to be able to promote the extraction of F in quantitation by cyanex *** and^(11)B and^(19)F NMR were adopted to characterize the different loaded organic *** on these results,the extraction mechanism of complicated system Ce(Ⅳ)-HF-H_(3)BO_(3)-H_(2)SO_(4)was further ***,the effect of H_(3)BO_(3)on the extraction and stripping of Ce(Ⅳ)in complicated system was ***,it shows that the addition of H_(3)BO_(3)has nothing to do with the purity of obtained CeF_(3)particle from bastneasite liquor in the practical *** H_(3)BO_(3)into bastnaesite leach liquor,on the one hand,will be beneficial for the recovery yield of Ce and *** the other hand,it can avoid from environmental pollution caused by emission of F-containing waste water as well as reducing the waste residue.

关键词： Ce(Ⅳ)-HF-H_(3)BO_(3)-H_(2)SO_(4) Extraction cyanex 923 Thermodynamic Mechanism Rare earths

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Effect of diluents on the extraction of praseodymium and samarium by cyanex 923 from acidic nitrate medium

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Journal of Rare Earths 2010年第2期28卷 215-220页

作者： YA El-Nadi Hot Laboratories Centre Atomic Energy Authority(Egypt)

The solvent extraction of Pr(Ⅲ) and Sm(Ⅲ) with trialkyl phosphine oxide(cyanex 923) in chloroform,carbon tetrachloride,n-octane,cyclohexane,1,2-dichloroethane,benzene,toluene,xylene and nitrobenzene from acidic nitrate medium was *** the basis of slope analysis data,the composition of the extracted species was determined as(M(NO3)3?2CY923),CY923 refers to cyanex *** values of the equilibrium constants and the separation factors were *** effect of the diluents on the metal extracti...

关键词： extraction diluents praseodymium samarium cyanex 923 rare earths

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Extraction and Stripping of Ytterbium (Ⅲ) from H_2SO_4 Medium by cyanex 923

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Journal of Rare Earths 2006年第6期24卷 685-689页

作者：王玮玮王香兰孟淑兰李红飞李德谦 Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied Chemistry Changchun 130022 ChinaGraduate School of the Chinese Academy of SciencesBeijing 100039China Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied Chemistry Changchun 130022 China

The extraction and stripping of ytterbium（ Ⅲ） from sulfuric acid medium using cyanex 923 in heptane solution was investigated. The effects of extraetant concentration, pH and sulfate ion as well as stripping agents, acidity and temperature on the extraction and stripping were studied. The equilibrium constants and thermodynamic parameters, such as △n （10.76 kJ·mol^-1）, △G （-79.26 kJ·mol^-1） and △S （292.41 J·K^-1·mol^-1）, were calculated. The extraction mechanism and the complex species extracted were determined by slope analysis and FTIR spectra. Furthermore, it was found that the extraction of Yb （Ⅲ） from sulfuric acid medium by cyanex 923 increased with pH, concentration of SO4^2-, HSO4^-, and extractant concentration, and approximately a quantitative extraction of Yb（ Ⅲ） was achieved at an equilibrium pH near 3.0, and the extracted complex was YbSO4（HSO4）·2cyanex923（o）.

关键词： extraction stripping thermodynamics ytterbium cyanex 923 rare earths

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EXTRACTION KINETICS OF YTTRIUM WITH PURIFIED cyanex 923 FROM NITRATE MEDIUM

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Acta Metallurgica Sinica(English Letters) 2003年第6期16卷 428-432页

作者： H. Tong, Y.G. Wang, J.H. Lei, D.Q. Li, and P. TangDepartment of Applied Chemistry, Wuhan University of Technology, Wuhan 430070, China Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, The Chinese Academy of Sciences, Changchun 130022, China Dept. of Appl. Chem. Wuhan Univ. of Technol. Wuhan 430070 China Lab. of Rare Earth Chem. and Phys. Changchun Inst. of Appl. Chem. Chinese Acad. of Sci. Changchun 130022 China

Mass transfer and extraction kinetics of yttrium with the purified cyanex 923 in n-heptane from nitrate medium have been investigated by using a constant interfacial cell with laminar flow at 298K. The interfacial adsorption properties of purified cyanex 923-heptane-0.20mol/L (H, Na)NO3 were studied at 298K. The experimental results show that the mass transfer is controlled by diffusion and the chemical reactions are carried out in the interfacial zone. The extraction rates of yttrium were measured at different chemical compositions by varying ionic strength, pH values and the purified cyanex 923 concentrations. The initial extraction rate equations were obtained.

关键词： yttrium cyanex 923 extraction kinetics interfacial tension

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EFFECT OF BORIC ACID ON THE EXTRACTION OF BASTNASITE LEACHING LIQUOR BY cyanex 923

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化工学报 2000年第S1期51卷 126-129页

作者： Liao Wuping, Li Deqian (Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry Chinese Academy of Sciences, Changchun, 130022)

The effect of boric acid on the extraction of bastnasite leaching liquor by cyanex 923 was studied. Boric acid wasn’t extracted alone by cyanex 923 and didn’t influence the cerium(IV) extraction. But it can enhance ... 详细信息

关键词： boric acid bastnasite cyanex 923

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Extraction of Yttrium (Ⅲ) into [C_8 mim][PF_6] Containing cyanex 923

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Journal of Rare Earths 2007年第S2期25卷 153-156页

作者：彭波孙晓琦陈继马玖彤 College of Chemistry Jilin University Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied ChemistryGraduate School from Chinese Academy of Science Chinese Academy of Science

The extraction of Yttrium (Ⅲ) into [Cnmim][PF6] (n= 4, 6, 8) containing cyanex 923 was studied in this paper. The mechanism of this extraction was indicated to be cation exchange. In addition, the extraction process is an endothermic reaction. The RTILs with shorter alkyl chain behave higher extraction efficiency during the extraction, however, which has also more loss to aqueous phase since the cation exchange mechanism.

关键词： room temperature ionic liquid extraction cyanex 923 yttrium

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Extraction Kinetics of Lanthanum with Purified cyanex 923 from Nitrate Medium

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Wuhan University Journal of Natural Sciences 2003年第3A期8卷 871-874页

作者： TongHui LiDe-qian WangYi-ge LeiJia-heng SchoolofNaturalSciences WuhanUniversityofTechnologyWuhan430070HubeiChina LaboratoryofRareEarthChemistryandPhysics ChangchunInstituteofAppliedChemistryChineseAcademyofSciencesChangchun130022JilinChina

Solvent extraction kinetics of lanthanum with purified cyanex 923 in heptane from nitrate medium was investigated by using a constant interfacial cell with laminar flow at 303 K. The effects of stirring speed, temperature and specific interface on the extraction rate were studied. The experimental results showed that the extraction apparent activation energy was 32.0 kJ\5mol -1 and the extraction process was controlled by both chemical reaction and diffusion. The extraction rates were measured at different chemical compositions by varying ionic strength, pH value and the concentration of purified cyanex 923. The initial extraction rate equation was obtained.

关键词： lanthanum cyanex 923 solvent extraction kinetics

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