In the present work, a novel α-aminophosphonate extractant（Cextrant 230） was synthesized for the extraction and recovery of cerium and thorium from sulphate medium. The introduction of amine group into the phosphat...In the present work, a novel α-aminophosphonate extractant（Cextrant 230） was synthesized for the extraction and recovery of cerium and thorium from sulphate medium. The introduction of amine group into the phosphate molecule would enhance the extraction of Ce（Ⅳ） and Th（Ⅳ）. The effects of extractant concentration, H2SO4 concentration and temperature on the metal extraction were investigated in detail. It was found that the extraction of Ce（Ⅳ）, Th（Ⅳ） and REs（La, Gd, Yb） in sulphate medium decreased in the following order： Ce（Ⅳ）〉Th（Ⅳ）〉REs（Ⅲ）. A solvent extraction process to extract and recover cerium and thorium from bastnasite leaching was proposed, in which the purities of cerium and thorium products reached 99.9% and 99% with yield of 92% and 98%, respectively.展开更多
Rare earths(REs) play a key role in high-tech fields and the associated thorium is a vital element for nuclear energy. However, to be used in high-tech industry or nuclear energy, these elements must first be recovere...Rare earths(REs) play a key role in high-tech fields and the associated thorium is a vital element for nuclear energy. However, to be used in high-tech industry or nuclear energy, these elements must first be recovered from the deposits and purified. As solvent extraction is the main technology for the recovery and purification of the metals, the review mainly presents our recent works on the extraction and separation of tetravalent cerium cation by neutral α-aminophosphonates, the individual rare earth separation by α-aminophosphonic acids, and the continuous preparation of high-purity thorium. The extraction and separation of some other metals are also discussed.展开更多
The syntheses, crystal structures, magnetic and luminescent properties of three isornorphous compounds [LnIII6（,u4-O）2（C4A）2- （NO3）2（HCOO）2（CH30）2（DMF）4（CH3OH）4] （Ln = Gd （1）, Tb （2） and Dy （3）; H...The syntheses, crystal structures, magnetic and luminescent properties of three isornorphous compounds [LnIII6（,u4-O）2（C4A）2- （NO3）2（HCOO）2（CH30）2（DMF）4（CH3OH）4] （Ln = Gd （1）, Tb （2） and Dy （3）; H4C4A = p-tert-butylcalix[4]arene） are reported. These three compounds are featured with the sandwich-like units constructed by two tail-to-tail calixarene molecules and an in-between Lnm6 octahedron. The DyTM compound exhibits both single molecule magnet behavior and photoluminescence.展开更多
基金Project supported by National Basic Research Program of China(973 program,2012CBA01206)the National Natural Science Foundation of China(21521092,51222404)the Strategic Priority Research Program of CAS(XDA02030100)
文摘In the present work, a novel α-aminophosphonate extractant（Cextrant 230） was synthesized for the extraction and recovery of cerium and thorium from sulphate medium. The introduction of amine group into the phosphate molecule would enhance the extraction of Ce（Ⅳ） and Th（Ⅳ）. The effects of extractant concentration, H2SO4 concentration and temperature on the metal extraction were investigated in detail. It was found that the extraction of Ce（Ⅳ）, Th（Ⅳ） and REs（La, Gd, Yb） in sulphate medium decreased in the following order： Ce（Ⅳ）〉Th（Ⅳ）〉REs（Ⅲ）. A solvent extraction process to extract and recover cerium and thorium from bastnasite leaching was proposed, in which the purities of cerium and thorium products reached 99.9% and 99% with yield of 92% and 98%, respectively.
基金supported by the National Program on Key Basic Research Project(973 Program)(Grant No.2012CBA01206)the National Natural Science Foundation of China(Grant Nos.21521092,51222404)+1 种基金the Strategic Priority Research Program of CAS(Grant No.XDA02030100)the Open Project of State Key Laboratory of Rare Earth Resource Utilization(Grant No.RERU2017019)
文摘Rare earths(REs) play a key role in high-tech fields and the associated thorium is a vital element for nuclear energy. However, to be used in high-tech industry or nuclear energy, these elements must first be recovered from the deposits and purified. As solvent extraction is the main technology for the recovery and purification of the metals, the review mainly presents our recent works on the extraction and separation of tetravalent cerium cation by neutral α-aminophosphonates, the individual rare earth separation by α-aminophosphonic acids, and the continuous preparation of high-purity thorium. The extraction and separation of some other metals are also discussed.
基金financially supported by the National Natural Science Foundation of China (20971119, 51074148, 91026024)
文摘The syntheses, crystal structures, magnetic and luminescent properties of three isornorphous compounds [LnIII6（,u4-O）2（C4A）2- （NO3）2（HCOO）2（CH30）2（DMF）4（CH3OH）4] （Ln = Gd （1）, Tb （2） and Dy （3）; H4C4A = p-tert-butylcalix[4]arene） are reported. These three compounds are featured with the sandwich-like units constructed by two tail-to-tail calixarene molecules and an in-between Lnm6 octahedron. The DyTM compound exhibits both single molecule magnet behavior and photoluminescence.
