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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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synergistic extraction of cerium from sulfuric acid medium using mixture of 2-ethylhexyl phosphonic acid mono 2-ethylhexyl ester and Di-(2-ethyl hexyl) phosphoric acid as extractant

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Journal of Rare Earths 2009年第1期27卷 119-122页

作者：罗兴华黄小卫朱兆武龙志奇刘营 National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals Grirem Advanced Materials Co. Ltd.

synergistic extraction of cerium（IV） from sulfuric acid medium using mixture of 2-ethylhexyl phosphonic acid mono 2-ethylhexyl ester（HEH/EHP, HL） and Di-（2-ethyl hexyl） phosphoric acid（HDEHP, HA） as extractant was *** results indicated that the maximum synergistic enhancement coefficients were obtained at the mole fraction of HEH/EHP=0.6, and cerium（IV） was extracted into organic phase in the form of Ce（SO4）0.5HL2A2.A cation exchange mechanism was proposed for the synergistic extraction of Ce（IV）.The equilibrium constants and thermodynamic functions such as △G, △H, and △S were determined in the extraction of Ce（IV） from sulfuric medium using mixture of HEH/EHP and HDEHP.

关键词： synergistic extraction cerium HEH/EHP HDEHP sulfuric acid medium rare earths

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synergistic extraction of rare earth by mixtures of 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester and di-(2-ethylhexyl) phosphoric acid from sulfuric acid medium

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Journal of Rare Earths 2008年第3期26卷 410-413页

作者：黄小卫李建宁龙志奇张永奇薛向欣朱兆武 Institute of Metallurgical Resources & Environmental Engineering Northeastern University National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals and GRIREM Advanced Material Co. Ltd.

The extraction of Nd^3＋ and Sm^3＋, including the extraction and stripping capability as well as the separation effect of Nd^3＋ or Sm^3＋, from a sulfuric acid medium, by mixtures of di-（2-ethylhexyl） phosphoric acid （HDEHP, H2A2（0）） and 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester （HEH/EHP, H2L2（0）） were studied. The distribution ratios and synergistic coefficients of Nd^3＋ and Sm^3＋ in different acidities were also determined. A synergistic extractive effect was found when HDEHP and HEH/EHP were used as mixed extractants for Sm^3＋ or Nd^3＋. The chemical compositions of the extracted complex were determined as Nd.（HA2）2-HL2 and Sm.（HA2）2-HL2. The extraction equilibrium constants, enthalpy change, and entropy change of the extraction reaction were also determined.

关键词： di-(2-ethylhexyl) phosphoric acid 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester synergistic extraction mechanism, Sm^3+, Nd^3+ rare earths

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synergistic extraction of Lanthanides by 1-Nitroso-2-Naphthol and Trioctylphosphine Oxide in Paraffin Wax

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Rare Metals 2000年第4期19卷 306-311页

作者：郭效军高锦章范海燕彭波王碧邓启良康敬万西北师范大学化学系甘肃兰州 730070 西北师范大学甘肃兰州 730070

The paraffin wax was used as a diluent for 1-nitroso-2-naphthol(HA) and trioctylphosphine oxide(TOPO) in the extraction of lanthanides at 70℃. The composition of the extracted species was given as LnA_3(TOPO)_2 by means of the slope analysis. The variation of the synergistic extraction equilibrium constant(K_ sex) was investigated at 60～80℃, and the thermodynamic data were calculated. The dependence of separation factors on temperature was also studied.

关键词： synergistic extraction Lanthanides 1-nitroso-2-naphthol Trioctylphosphine oxide

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synergistic　extraction　of　Rare　Earth　Ions　by　1-phenyl-3-methyl-4-benzoyl-5-pyrazolone　and　Trioctylphousphine　Oxide　in　Paraffin　Wax

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Rare Metals 1997年第1期16卷 21-27页

作者：高锦章范海燕彭波康敬万

The paraffin wax was used as an organic solvent for 1 phenyl 3 methyl 4 benzoyl 5 pyrazolone (PMBP) and trioctylphousphine oxide (TOPO) in the extraction of rare earth ions (La 3+ , Pr 3+ , Eu 3+ , Yb 3+ and Ho 3+ ) at 70℃. The composition of the extracted specices were given as RE(PMBP) 3(TOPO) 2 by means of slope analysis. The variation of the synergistic extraction equilibrium constant ( K sex ) was studied at 55℃～70℃. The thermodynamic data obtained showed that the synergistic extraction of rare earth ions by PMBP and TOPO in molten paraffin wax is exothermic and the extracted complexes were formed by TOPO bonding to the outer sphere hydration.

关键词： synergistic extraction Rare earth Paraffin wax PMBP TOPO

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synergistic extraction OF Cd(Ⅱ)WITH PRIMARY AMINE N-1923 AND NEUTRAL ORGANOPHOSPHORUS REAGENTS

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Acta Metallurgica Sinica(English Letters) 1989年第10期2卷 248-254页

作者： MA Genxiang LI Deqian Changchun Institute of Applied Chemistry,Academia Sinica,Changchun,China Changchun Institute of Applied Chemistry,Academia Sinica,Changchun,Jilin,China

The synergistic extraction of Cd(Ⅱ)with primary amine N-1923 and neutral organophosphorus reagents(TBP,DBBP,B)from hydrochloric acid has been investigated at μ=0.5,t=25℃.The compositions of the synergistic extraction complexes and the mechanism of the synergistic extraction have been determined by the methods of slope and constant mole. The synergistic extraction complexes with composition(RNH_3Cl)_2·CdCl_2·B have been *** synergistic extraction reactions and additional reaction of Cd(Ⅱ)have been proposed as follows: CdCl_2+2RNH_3Cl_(o)+B_(o)(RNH_3Cl)_2·CdCl_2·B_(o) (RNH_3Cl)_3·CdCl_(2(o)+B_(o)(RNH_3Cl)_2·CdCl_2·B_(o)+RNH_3Cl_(o) In addition,the equilibrium constants and the thermodynamic functions of the synergistic ex- traction reactions have been *** IR and NMR spectra of the synergistic ext-ac- tion complexes of Cd(Ⅱ)have been studied as well.

关键词： primary amine neutral organophosphorus reagents synergistic extraction cadmium

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Study　on　the　synergistic　extraction　of　Ytterbium　with　1－Phenyl－3－Methyl－4－（α－Furoyl）－5－Pyrazolone　and　Neutral　Extractant

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Journal of Rare Earths 1994年第3期12卷 222-224页

作者：丁中涛刘松愈田应朝 Yunnan Univ Kunming China

The extraction of Yb3+ by HA [1-phenyl-3-methyl-4-(α-furoyl)-5-pyrazolone] and by HA in combination with a neutral extractant B in toluene have been studied, where B represents n-butyloctyl sulfoxide (BOSO), n-pentylhexyl sulfoxide (PHSO), ethyl-n-dodecyl sulfoxide (EDSO), diphenyl sulfoxide (DPSO) or TBP. The composition of the synergistic extraction complexes have been shown to be YbA3·B and their extraction equilibrium constants have been determined separately.

关键词： Ytterbium Pyrazolone synergistic extraction Neutral extractant Asymmetric sulfoxide

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synergistic extraction OF EUROPIUM（Ⅲ） WITH 2-THENOYLTRIFLUOROACETONE AND A LEWIS BASE AND THE APPLICATION TO PREPARATION OF BINUCLEAR COMPLEXES

SYNERGISTIC EXTRACTION OF EUROPIUM（Ⅲ） WITH 2-THENOYLTRIFL...

引用

International Solvent extraction Conference 2005

作者： Yuko Hasegawa Satoshi Kumaki Koichiro Tanaka Department of Chemistry Faculty of Science Science University of Tokyo Kagurazaka Shinjuku-ku Tokyo 162-8601 Japan Department of Chemistry Faculty of Science Science University of Tokyo Kagurazaka Shinjuku-ku Tokyo 162-8601 Japan Department of Chemistry Faculty of Science Science University of Tokyo Kagurazaka Shinjuku-ku Tokyo 162-8601 Japan

In the extraction of lanthanoids(III) with 2-thenoyltrifluoroacetone (Htta) and a Schiff base complexed copper(II), the distribution ratio of europium(III) has been measured as a function of pH, Htta

关键词： synergistic extraction Schiff base Cu(saltn) lanthanoids(III) stability constants binuclear complexes

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Comprehensive recovery of W,V,and Ti from spent selective reduction catalysts

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Rare Metals 2023年第10期42卷 3518-3531页

作者： Li-Wen Ma Xiao-Li Xi Jia-Peng Chen Fan Guo Zi-Jie Yang Zuo-Ren Nie Key Laboratory of Advanced Functional Materials Ministry of EducationFaculty of Materials and ManufacturingBeijing University of TechnologyBeijing100124China Collaborative Innovation Center of Capital Resource-Recycling Material Technology Beijing University of TechnologyBeijing100124China National Engineering Laboratory for Industrial Big-Data Application Technology Beijing University of TechnologyBeijing100124China

In this study,spent WO_(3)/V_(2)O_(5)-TiO_(2) catalysts used for selective catalytic reduction were treated by a hydrometallurgical process to comprehensively recover valuable metallic elements,such as W,V,and *** and Si impurities were preferentially removed by selective micro wave-assisted alkali leaching.W and V were leached by enhanced high-pressure leaching with efficiencies estimated at 95% and 81%.The leaching of W and V followed the nuclear shrinkage model controlled by the combination of product layer diffusion and interfacial chemical reaction.A synergistic extraction was applied to separate W and V using an extractant mixture of di-(2-ethylhexyl)phosphoric acid P204 and the primary amine *** extraction efficiencies of V and W reached 86.5% and 6.3%,respectively,with a separation coefficient(V/W) of *** product was precipitated after extraction to yield ammonium paratung state(APT) and NH_(4)VO_(3).The TiO_(2)catalyst carrier residue meets commercial specifications for *** comprehensive recovery process with the characteristics of high-pressure leaching and synergistic extraction realizes the resourceful utilization of the spent catalysts.

关键词： Spent selective catalytic reduction(SCR)catalysts Microwaveleaching Pressure leaching synergistic extraction Comprehensive recovery

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extraction and Separation of Rare Earths from Nitrate Medium by Mixtures of p-Phosphorylated Calixarene and 1-Phenyl-3-methyl-4-benzoyl-pyrazalone-5

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Chinese Journal of Chemistry 2014年第10期32卷 1077-1082页

作者： Youcai Lu Yanling Li Yanfeng Bi Wuping Liao State Key Laboratory of Rare Earth Resource Utilization ERC for the Separation and Purification of REs and ThoriumChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilin 130022China University of Chinese Academy of Sciences Beijing 100049China

The gadolinium extraction by the mixtures of p-phosphorylated calixarene and 1-phenyl-3-methyl-4-benzoylpyrazalone-5 from nitrate medium was studied,which indicated an obvious synergistic effect between these two *** extractants exhibit no interaction with each other before the metal ***(Ⅲ)was extracted by the species of Ln(PMBP)_(2)L_(2)(NO_(3))instead of Ln(PMBP)_(3)•(HPMBP)or Ln(NO_(3))_(3)•2L which are extracted by HPMBP or L *** functions(ΔG,ΔH,ΔS)were *** extraction of other rare earths was also investigated and *** single rare earth separation was discussed.

关键词： synergistic extraction 1-phenyl-3-methyl-4-benzoyl-2-pyrazolin-5-one p-phosphorylated calixarene rare earths

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