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International Journal of Minerals,Metallurgy and Materials 2022年第3期29卷 479-489页

作者： Yuhui Liu Meng Tang Shuang Zhang Yuling Lin Yingcai Wang Youqun Wang Ying Dai Xiaohong Cao Zhibin Zhang Yunhai Liu State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China

To improve the separation capacity of uranium in aqueous solutions, 3R-MoS2 nanosheets were prepared with molten salt electro- lysis and further modified with polypyrrole (PPy) to synthesize a hybrid nanoadsorbent (PPy/3R-MoS2). The preparation conditions of PPy/3R- MoS2 were investigated and the obtained nanosheets were characterized with scanning electron microscope (SEM), high resolution transmis- sion electron microscope (HRTEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectro- scopy (XPS). The results showed that PPy/3R-MoS2 exhibited enhanced adsorption capacity toward U(VI) compared to pure 3R-MoS2 and PPy;the maximum adsorption was 200.4 mg/g. The adsorption mechanism was elucidated with XPS and FTIR: (1) negatively charged PPy/3R-MoS2 nanosheets attracted by an electrostatic interaction;(2) exposed C, N, Mo, and S atoms complexed with U(VI) through co- ordination;(3) Mo in the complex partly reduced the adsorbed U(VI) to U(IV), which further regenerated the adsorption point and continu- ously adsorbed U(VI). The design of the PPy/3R-MoS2 composite with a high adsorption capacity and chemical stability provides a new direc- tion for the removal of radionuclide.

关键词： molten salt electrolysis 3R-MoS2 nanosheets polypyrrole modification adsorption uranium

Recovery and separation of Fe and Mn from simulated chlorinated vanadium slag by molten salt electrolysis

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International Journal of Minerals,Metallurgy and Materials 2020年第12期27卷 1678-1686页

作者： Shi-yuan Liu Yu-lan Zhen Xiao-bo He Li-jun Wang Kuo-chih Chou Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

Tailings from the vanadium extraction process are discarded each year as waste,which contain approximately 30 wt%of *** our previous work,we extracted Fe and Mn from vanadium slag,and Fe and Mn existed in the form of FeCl_(2) and MnCl_(2) after chlorination by NH_(4) Cl to achieve effective and green usage of waste containing Fe and *** this work,square wave voltammetry(SWV)and cyclic voltammetry(CV)were applied to investigate the electrochemical behaviors of Fe^(2+)and Mn^(2+)in Na Cl-KCl melt at 800℃.The reduction processes of Fe^(2+)and Mn^(2+)were found to involve one *** diffusion coefficients of FeCl_(2) and Mn Cl_(2) in molten salt of eutectic mixtures Na Cl-KCl molten salt were *** electrodeposition of Fe and Mn were performed using two electrodes at a constant cell *** Mn/Fe mass ratio of the electrodeposited product in Na Cl-KCl-2.13 wt%FeCl_(2)-1.07 wt%Mn Cl_(2) was 0.0625 at 2.3 *** the electrolysis of NaCl-KCl-2.13 wt%Fe Cl_(2)-1.07 wt%MnCl_(2) melted at 2.3 V,the electrolysis was again started under 3.0 V and the Mn/Fe mass ratio of the electrodeposited product was *** process provides a novel method to effectively separate Fe and Mn from simulated chlorinated vanadium slag.

关键词： vanadium slag molten salt electrolysis separation electrochemical analysis

Thermodynamic analysis on the direct preparation of metallic vanadium from NaVO_3 by molten salt electrolysis

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Chinese Journal of Chemical Engineering 2016年第5期24卷 671-676页

作者： Wei Weng Mingyong Wang Xuzhong Gong Zhi Wang Zhancheng Guo State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Key Laboratory of Green Process and EngineeringInstitute of Process EngineeringChinese Academy of Sciences

A novel and environmentally friendly route to directly prepare metallic vanadium from NaV03 by molten salt electrolysis is proposed. The feasibility about the direct electro-reduction of NaV03 to metallic vanadi- um is analyzed based on the thermodynamic calculations and experimental verifications. The theoretical decomposition voltage of NaV03 to metallic vanadium is only 0.47 V at 800 ℃ and much lower than that of the alkali and alkali earth metal chloride salts. The value is slightly higher than that of low-valence vanadium oxides such as V203, V305 and VO. However, the low-valence vanadium oxides can he further electro-reduced to metallic vanadium thermodynamically. The thermodynamic analysis is verified by the experimental results. The direct preparation of metallic vanadium from NaV03 by molten salt electrolysis is feasible.

关键词： molten salt electrolysis NaV03 Thermodynamic analysis Metallic vanadium Decomposition voltage

Hydrogenation reaction of metallic titanium prepared by molten salt electrolysis

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Transactions of Nonferrous Metals Society of China 2016年第5期26卷 1425-1432页

作者：翁启钢李瑞迪袁铁锤史玉升邱子力蒋明祥贺跃辉中南大学粉末冶金国家重点实验室长沙410083 华中科技大学材料成形与模具技术国家重点实验室武汉430074

The hydrogenation reaction of electrolyzed titanium, as the first step during hydrogenation-dehydrogenation for the preparation of titanium powder, was studied. The titanium hydride was prepared through the reaction between electrolyzed titanium and hydrogen at different hydrogenation temperatures and different time. The evolutions of hydrogen and oxygen contents, density, hardness and phase composition before and after hydrogenation were characterized under different hydrogenation conditions. The results show that the main phases of titanium hydride were TiHl.924, TiH1.971 and TiH2. Increasing the hydrogenation temperature could not enhance the hydrogen content but increase the oxygen content. The effect of the hydrogenation time on the hydrogen content was not obvious. The optimal parameters of the hydrogenation process were obtained： beating at 400℃ and holding for 2 h, by which the hydrogen content of 3.63% and oxygen content of 0.18% （mass fraction） can be obtained. In addition, the microstructure, orientations and tissues of electrolyzed titanium and titanium hydride were detected.

关键词： titanium powder hydrogenation reaction molten salt electrolysis hydrogen content

Annihilating the Formation of Silicon Carbide:molten salt electrolysis of Carbon-Silica Composite to Prepare the Carbon-Silicon Hybrid for Lithium-lon Battery Anode

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Energy & Environmental Materials 2020年第2期3卷 166-176页

作者： Xianbo Zhou Hongwei Xie Xiao He Zhuqing Zhao Qiang Ma Muya Cai Huayi Yin Key Laboratory for Ecological Metallurgy of Multimetallic Mineral of Ministry of Education School of metallurgyNortheastern University110819Shenyang China Key Laboratory of Data Analytics and Optimization for Smart Industry(Northeastern University) Ministry of Education110819Shenyang China

Silicon(Si)and carbon(C)composites hold the promise for replacing the commercial graphite anode,thus increasing the energy density of lithium-ion batteries(LIBs).To mitigate the formation of SiC,this paper reports a molten salt electrolysis approach to prepare C-Si composite by the electrolysis of C-SiO2 *** the conventional way of making a C coating on Si,C-SiO2 composites were prepared by pyrolyzing the low-cost sucrose and *** electrochemical deoxidation of the C-SiO2 composites not only produces nanostructured Si inside the C matrix but also introduces voids between the C and Si owing to the volume shrinkage from converting SiO2 to *** importantly,the use of Mg ion-containing molten salts precludes the generation of SiC,and the electrolytic Si@C composite anode delivers a capacity of about 1500 mAh g-1 after 100 cycles at a current density of 500 mA ***,the Si@C‖LiNi0.6Co0.2Mn0.2O2 full cell delivers a high energy density of 608 Wh ***,the molten salt approach provides a one-step electrochemical way to convert oxides@C to metals@C functional materials.

关键词： anode material carbon lithium-ion batteries molten salt electrolysis silicon

Enhanced preparation of dendritic metallic vanadium in recyclable NaCl-KCl-VCl_(2) molten salt by V_(2)CO electrolysis

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Rare Metals 2024年第8期43卷 3961-3973页

作者： Jia-Liang An Ming-Yong Wang Yong-Zheng Jia Jin-Tao Zhang Bao-Yan Feng Shu-Qiang Jiao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China College of Material Science and Engineering Hebei Province Laboratory of Inorganic Nonmetallic MaterialsNorth China University of Science and TechnologyTangshan 063210China

A promising method for the preparation of pure metallic vanadium via V_(2)CO anode electrolysis was proposed and *** simple and controllable synthesis of a molten chloride salt containing VCl_(2) by an insitu reaction between VCl_(3) and metallic vanadium was verified through thermodynamic analysis and ***-KCl-VCl_(2) molten salt exhibited excellent recycling performance and could be repetitively used to prepare metallic vanadium by V_(2)CO *** V^(2+) ions remained in the molten salt after *** electrolysis conditions,such as the cathode diameter,current density,V^(2+) ion concentration,and temperature,were optimised to maximise the current *** was also simulated to reveal the regulatory *** highest current efficiency was 85%.The purity of metallic vanadium was up to 99.8%.In this study,an easy and efficient preparation of pure metallic vanadium was achieved.

关键词： V_(2)CO Metallic vanadium Current efficiency molten salt electrolysis

Study of Al-Sc Alloy Prepared by molten salt electrolysis Method

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Study of Al-Sc Alloy Prepared by Molten Salt Electrolysis Me...

Electrochemical mechanism of electrolysis codeposition of Mg-Sr alloy in molten salt

第六届国际稀土开发与应用研讨会

作者： Zhai Xiujing,Fu Yan,guo rui,zhang mingjie School of Materials & Metallurgy,Northeastern University,Shenyang 110004,P.R.China

The direct electrolysis operation process of Al-Sc alloys is studied on the basis of thermodynamics *** results show that the content of Sc in the alloys is going up with ScO content rising or AlO content reducing in electrolyte,and increases with the higher electrolysis temperature,longer pole distance and stronger current density which, however,have small influence on Sc content in *** increase of ScO content in the electrolyte raises current efficiency,but AlO has the contrary effect. Metallographic and SEM analysis of the Al-Sc alloy samples from direct electrolysis has been carried *** results show that the alloys containing 0.5 wt%Sc can exhibit superior performances owing to the fine,dispersed AlSc particles in the alloys. When AlSc content in alloys reaches 2%,the particle sizes in the samples from direct electrolysis almost keep unchanged,and those from thermal reduction become very *** can gain better metallographic structured production and higher efficiency can be got as well by direct electrolysis.

关键词： molten salt electrolysis Al-Sc Alloy Scandium Oxide Electro-chemical EMF

来源： cnki会议评论

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Transactions of Nonferrous Metals Society of China 2014年第5期24卷 1629-1634页

作者：孙秀云路贵民范书迪华东理工大学承压系统安全科学教育部重点实验室国家盐湖资源综合利用工程技术研究中心上海200237

The electrochemical process of Mg-Sr codeposition was studied in MgCl2-SrCl2-KCl melts containing different MgCl2 concentrations at 700 ℃ by cyclic voltammetry, chronopotentiometry and chronoamperometry. The results show that the actual precipitation potential of Sr reduces by nearly 0.5 V because of the depolarization effects of Sr activity reduced by forming Mg-Sr alloy. The codeposition potential condition of Mg and Sr to form Mg-Sr alloy is as follows： When electrode potential is more negative than -1.5 V, the magnesium will precipitate; when electrode potential is more negative than -2.0 V, the magnesium and strontium will both deposit. The control step of codeposition process of Mg and Sr is not diffusion control step. The codeposition current condition of Mg and Sr to form Mg-Sr alloy by chronoptentiometry is as follows： cathode current densities are higher than 0.71, 1.57 and 2.83 A/cm^2 in MgCl2-SrCl2-KCl melts with MgCl2 concentrations of 2%, 5% and 10% （mass fraction）, respectively. Key words：

关键词： molten salt electrolysis Mg-Sr alloy electrochemical reduction

Optimal V_(2)O_(3) extraction by sustainable vanadate electrolysis in molten salts

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Tungsten 2024年第1期6卷 141-149页

作者： Bao-Yan Feng Zhong-Hua Zhao Yong-Zheng Jia Jia-Liang An Ming-Yong Wang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Green Recovery and Extraction of Rare and Precious Metals University of Science and Technology BeijingBeijing 100083China

Recently,an environmentally friendly electrolysis process of soluble vanadates is proposed and successfully confirmed for V_(2)O_(3) *** this paper,the solubilities of various vanadates(***_(3),Na_(4)V_(2)O_(7) and Na_(3)VO_(4))in NaCl molten salt are *** dependences of V_(2)O_(3) extraction on vanadate form,anode material and molten salt system are studied.A long-term electrolysis is carried *** result indicates that the solubilities of all vanadates are high and meet electrolytic *** to Na_(4)V_(2)O_(7) and Na_(3)VO_(4),NaVO_(3) exhibits larger current efficiency and lower electricity *** using SnO_(2) anode instead of graphite anode,the current efficiency of NaVO_(3) electrolysis can be increased to 58.1%and carbon pollution is avoided at 700℃.The extraction rate of V_(2)O_(3) reaches 81.3%after long-term electrolysis of 51 *** work optimizes the electrochemical preparation process of V_(2)O_(3) from various vanadates and contributes to the improvement of current efficiency and extraction rate.

关键词： molten salt electrolysis Vanadate Vanadium trioxide Current efficiency

Preparation of Mg-Li alloys by electrolysis in molten salt at low temperature

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Chinese Chemical Letters 2007年第3期18卷 329-332页

作者： Mi Lin Zhang Yong De Yan Zhi Yao Hou Lu An Fan Zeng Chen Ding Xiang Tang College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

A new technology for preparation of low cost Mg-Li alloys was studied. The alloys were prepared by electrolysis in molten LiCl-KCl （weight ratio is 1：1） electrolyte with Mg rod severing as the consumed cathode. Main factors that affect current efficiency were investigated, and optimal electrolysis parameters were obtained. Mg-Li alloys with low lithium Content （about 25%） were prepared by the unique method of a higher post-thermal treatment temperature after electrolysis at low temperature. The results showed that the electrolysis can be carried out at low temperature, which resulted in reducing preparation cost due to energy saving. The new technology for the oreoaration of Mg-Li alloy by electrolysis in molten salt was laroved to be feasible.

关键词： Mg-Li alloys molten salt electrolysis Low temperature Current efficiency