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Synergistic extraction of heavy rare earths by mixture of α-aminophosphonic acid HEHAMP and HEHEHP

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Journal of Rare earths 2019年第4期37卷 422-428页

作者： Qi Zhao Yanling Li Shengting Kuang Zhifeng Zhang Xue Bian Wuping Liao School of Metallurgy Northeastern University State Key Laboratory of Rare Earth Resource Utilization ERC for the Separation and Purification of REs and Thorium Changchun Institute of Applied Chemistry Chinese Academy of Sciences

Synergistic extraction of heavy rare earths(REs) were investigated in chloride media by the mixture of(2-ethylhexylamino)methyl phosphonic acid mono-2-ethylhexyl ester(HEHAMP) and 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester(HEHEHP). The maximum synergistic enhancement coefficients(R) of Lu, Yb, Tm, Er, Y and Ho are 2.89, 2.76, 2.54, 2.14, 2.14 and 2.06, respectively, when the mole fraction X_(HEHAMP) is 0.5. The synergistic separation factors of the heavy REs are obtained(β_(Y/Ho)=1.31,β_(Er/Y)= 1.61,β_(Tm/Er)= 1.78, β_(Yb/Tm)= 1.76, β_(Lu/Yb) = 1.20). The extracted complex is determined to be RE[H(EHAMP)_2][H(EHEHP)_2]_2 by the slope analysis method. The loading capacities of the mixtures consisting of 15% HEHAMP and 15% HEHEHP for Y and Lu are about 26.59 g/L(Yb_2 O_3) and 27.25 g/L(Lu_2 O_3),respectively.

关键词： Synergistic extraction α-aminophosphonic acid extractant HEHEHP Heavy rare earths

Development course of separating rare earths with acid phosphorus extractants: A critical review

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Journal of Rare earths 2019年第5期37卷 468-486页

作者： Deqian Li State Key Laboratory of Rare Earth Resources Changchun Institute of Applied Chemistry Chinese Academy of Sciences

This paper reviews the development course of separating rare earths with acid phosphorus extractants,including extraction chemistry(thermodynamics and kinetics), separation process and industrial application, the loss... 详细信息

关键词： Rare earths Acid phosphorus extractants Extraction chemistry Separation process Loss/Degradation of extractants

Motors drive high demand for rare earths

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China Rare Earth Information 2022年第1期28卷 24-26页

作者： YANG Lihong HU Bo Huajin Securities

1.Rare earths become the driving materials of low-carbon and intelligent era(1)Wide applications of rare earths in low-carbon and intelligent industries Low carbonization and industrial intelligence are two of the most important power driving the economy growth of China and the world today.And rare earths are the core materials for these two driving forces.

关键词： earths rare driving

Micro-alloying of Rare earths in Heavy Rail Steel

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稀有金属材料与工程 2011年第S3期40卷 245-249页

作者： Huang Yahe, Liu Chengjun, Jiang Maofa Northeastern University, Shenyang 110819, China Northeastern Univ Sch Met & Mat Shenyang 110819 Peoples R China

In the present study, heavy rail steel was prepared by the process of vacuum induction furnace smelting, forge work and rolling. Effects of Rare earths (RE) on microstructure and mechanical properties of heavy rail steel were systematically investigated by metallographic microscope, SEM, integrated mechanical testing machine, impact tester and so on. Metallographic analysis shows that, a few of RE can evidently delay the growth of austenite grain and fine pearlite. When the RE content is 0.016%, both annealing and normalizing pearlite laminae distances reach the minimum which is 115 nm (annealing) and 104nm (normalizing), respectively. But when the RE content reaches 0.133%, the annealing and normalizing pearlite laminae distance is respectively increased by 40% and 13%. Mechanical properties tests show that, a few of RE has not notable effect on the strength, but both plasticity and ductility can be improved obviously. When the RE content is 0.016%, both plasticity and ductility reach maximum. The maximum of elongation and reduction of area is 13.3% and 29.0%, respectively. However, when the RE content reaches 0.133%, the strength, plasticity and ductility are decreased. Especially, the low temperature (-40 ℃) and room temperature (20 ℃) ballistic work is respectively decreased by 9% and 24.8%.

关键词： rare earths heavy rail steel austenite pearlite mechanical properties

Study on Physical and Chemical Behaviors of Rare earths in Preparing Ceramic Tube Supported Palladium Film by Electroless Plating

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Journal of Rare earths 2006年第z2期24卷 259-262页

作者：蒋柏泉叶志强彭健 School of Environmental and Chemical Engineering Nanchang University

The rare earths of ytterbium, lanthanum, praseodymium, neodymium and their binary mixtures were respectively added into the traditional electroless plating solution to prepare thin palladium film on the inner surface of porous ceramic tube. The experimental results shows that the addition of rare earths increases palladium deposition rates and the binary mixtures are superior to the single rare earths and the mixture of ytterbium-lanthanum is the most efficient. Adding the mixture of ytterbium-lanthanum can also reduce the plating temperature by 10～20 ℃, shrink the metal crystal size and improve the film densification compared to those by traditional electroless plating. A thin palladium film with 5 μm was prepared and the film made a highly pure hydrogen with a molar fraction of more than 99.97% from a H2-N2 gas mixture. More attentions were paid to analyze the physical and chemical behaviors of the rare earths in palladium film preparation.

关键词： electroless plating palladium hydrogen separation rare earths

Effect of Rare earths on Electronic Structure of (110) Twin Martensite Boundary for Ni_2MnGa Alloy

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Journal of Rare earths 2006年第z2期24卷 372-375页

作者：万见峰费燕琼王健农 School of Materials Science and Engineering Shanghai Jiao Tong University Research Institute of Robotics Shanghai Jiao Tong University

The doping effect of rare earth elements (Tb and Sm) on the electronic structure of (110) martensitic twin boundary in Ni2MnGa alloys was investigated by using ab initio method within the DFT and the supercell implementation. The calculated results show that the atomic relaxation lowers the boundary energy and the segregation energy. Sm seems easier to segregate to the boundary and has a greater doping effect compared with Tb due to its lower segregation energy and bigger bonder order with neighboring atoms. Tb makes a greater contribution to the magnetic properties of the twin boundary than Sm.

关键词： twin boundary electronic structure Ni-Mn-Ga alloy rare earths

Enhanced Photoactivity of Layered Nanocomposite Materials Containing Rare earths,Titanium Dioxide and Clay

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Journal of Rare earths 2006年第z2期24卷 251-254页

作者：欧秀芹孟军平王其民于俊梅 Institute of Power Source and Ecomaterials Science Hebei University of Technology

The nanocomposite materials containing rare earths, titanium dioxide and clay (RE/TiO2/Clay) were characterized and tested for the photocatalytic decomposition of formaldehyde. The results show that nanocomposite materials prepared by doping appropriate rare earth elements have better photocatalytic properties than that prepared by doping excessive rare earth elements. The photocatalytic mechanism of composite materials was studied by integrating the theory of photocatalysis with experiment results. Because the site of photocatalytic reaction was limited in the interspace of clay, photocatalytic reaction occurred by two steps: firstly, organic molecules dispersed into the interlayers of clay; secondly, organic molecules and photocatalyst of RE/TiO2 occurred photocatalytic reaction, resulting in forming carbon dioxide.

关键词： titanium dioxide clay composite materials preparation photocatalytic reaction rare earths

Xiamen Tungsten sees skyrocketing profits in rare earths

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China Rare Earth Information 2019年第7期25卷 4-6页

A Chinese company that specializes in tungsten products and rare earths on Monday reported a sharp decline in overall profit,but a surge in profit from its rare-earth business,as the metals essential for high-tech pro... 详细信息

关键词： Xiamen Tungsten rare earths

A new magnetic way to separate rare earths

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China Rare Earth Information 2019年第11期25卷 4-6页

A new magnetic way to separate rare earths One of the experiments allowed the researchers to obtain 99.7%dysprosium in one step from a 50/50 mixture of lanthanum and dysprosium.(Image by Thierry Ehrmarm,Flickr).Researchers at Pennsylvania University found a way to separate mixtures of rare earth metals by combining a magnetic field with a decrease in temperature,a process that causes metal ions to crystallize at different rates.

关键词： rare lanthanum earths