Studies were carried out on the extraction characters of trivalent rare earths from chloride solutions using organophosphorus acids 2-ethylhexylphosphonic acid mono-（2-ethylhexyl） ester （HEHEHP） combined with [di-...Studies were carried out on the extraction characters of trivalent rare earths from chloride solutions using organophosphorus acids 2-ethylhexylphosphonic acid mono-（2-ethylhexyl） ester （HEHEHP） combined with [di-（2-ethylhexyl）-phosphoric acid （HDEHP）,isopropylphosphonic acid 1-hexyl-4-ethyloctyl ester （HHEOIPP）,bis（2,4,4-trimethylpentyl）-phosphinic acid （Cyanex 272）,bis（2,4,4-trimethypentyl）-monothiophosphinic acid （Cyanex 302） or bis（2,4,4-trimethypentyl）-dithiophosphinic acid （Cyanex 301）] as extractants. The effect of the equilibrium aqueous acidity on the extraction was studied. According to the corresponding separation factors for adjacent pairs of rare earths,it could be concluded that HEHEHP and Cyanex 272 could be employed for the separation of Tm（Ⅲ）,Yb（Ⅲ）,Lu（Ⅲ） from the other rare earths. Taking Yb（Ⅲ） as an example,based on the different stripping acid,the potential of the stripping was estimated.展开更多
Knowledge of the solubilization behaviors of rare-earth-extractant complex is mandatory for full comprehension of interfacial phenomenon and intermediate state of rare earth（RE） ion transport from water to oil durin...Knowledge of the solubilization behaviors of rare-earth-extractant complex is mandatory for full comprehension of interfacial phenomenon and intermediate state of rare earth（RE） ion transport from water to oil during solvent extraction. The lutetium with 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester（P507） extraction system was explored as a case study for the solubilization behaviors in this paper. With a quantitative analysis of a white crud obtained in the practical process, the results demonstrate that the insoluble REL3（L = the anion of P507） complex enriches at the oil/water interface and forms the network polymers. Besides, with the increase of RE loading ratios in the oil phase, the interfacial tension increases while the free ligand in the bulk phase decreases, which results in the flocculation of REL3 complex and the formation of polymers at the interface. Furthermore,the properties of the oil phase and the interface reveal that the free ligand can solubilize the REL3 complex along with the transfer of water from microemulsion to aqueous phase. In addition, the change of aqueous acidity can regulate the solubilization behaviors of the interfacial complex to improve RE extraction efficiency. These fundamental studies will hopefully provide new insights into the solubilization of metal-extractant complex and a technical guidance to the transfer of RE from water to oil.展开更多
This paper reviewed various systems such as neutral phosphorus and acid phosphorus, carboxylic acid and amine extractant for solvent extraction chemistry of yttrium, including thermodynamics, kinetics and yttrium extr...This paper reviewed various systems such as neutral phosphorus and acid phosphorus, carboxylic acid and amine extractant for solvent extraction chemistry of yttrium, including thermodynamics, kinetics and yttrium extracting separation process containing the development course and new separation process.展开更多
基金Project supported by the Science and Technology Research Project of Hubei Provincial Department of Education (B20094007)Wuhan Mu-nicipal Institutions of Scientific Project (2008K018)
文摘Studies were carried out on the extraction characters of trivalent rare earths from chloride solutions using organophosphorus acids 2-ethylhexylphosphonic acid mono-（2-ethylhexyl） ester （HEHEHP） combined with [di-（2-ethylhexyl）-phosphoric acid （HDEHP）,isopropylphosphonic acid 1-hexyl-4-ethyloctyl ester （HHEOIPP）,bis（2,4,4-trimethylpentyl）-phosphinic acid （Cyanex 272）,bis（2,4,4-trimethypentyl）-monothiophosphinic acid （Cyanex 302） or bis（2,4,4-trimethypentyl）-dithiophosphinic acid （Cyanex 301）] as extractants. The effect of the equilibrium aqueous acidity on the extraction was studied. According to the corresponding separation factors for adjacent pairs of rare earths,it could be concluded that HEHEHP and Cyanex 272 could be employed for the separation of Tm（Ⅲ）,Yb（Ⅲ）,Lu（Ⅲ） from the other rare earths. Taking Yb（Ⅲ） as an example,based on the different stripping acid,the potential of the stripping was estimated.
基金Project supported by the National Basic Research Program of China(2012CBA01202)the Natural Science Foundation of China(51174184)the Key Research Program of the Chinese Academy of Sciences(KGZD-EW-201-1)
文摘Knowledge of the solubilization behaviors of rare-earth-extractant complex is mandatory for full comprehension of interfacial phenomenon and intermediate state of rare earth（RE） ion transport from water to oil during solvent extraction. The lutetium with 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester（P507） extraction system was explored as a case study for the solubilization behaviors in this paper. With a quantitative analysis of a white crud obtained in the practical process, the results demonstrate that the insoluble REL3（L = the anion of P507） complex enriches at the oil/water interface and forms the network polymers. Besides, with the increase of RE loading ratios in the oil phase, the interfacial tension increases while the free ligand in the bulk phase decreases, which results in the flocculation of REL3 complex and the formation of polymers at the interface. Furthermore,the properties of the oil phase and the interface reveal that the free ligand can solubilize the REL3 complex along with the transfer of water from microemulsion to aqueous phase. In addition, the change of aqueous acidity can regulate the solubilization behaviors of the interfacial complex to improve RE extraction efficiency. These fundamental studies will hopefully provide new insights into the solubilization of metal-extractant complex and a technical guidance to the transfer of RE from water to oil.
基金Project supported by the National Basic Research Program(973 Program)(2006CB403302)
文摘This paper reviewed various systems such as neutral phosphorus and acid phosphorus, carboxylic acid and amine extractant for solvent extraction chemistry of yttrium, including thermodynamics, kinetics and yttrium extracting separation process containing the development course and new separation process.
