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electrorefining of nickel from nickel–chromium alloy in molten LiCl–KCl

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Nuclear Science and Techniques 2019年第9期30卷 47-54页

作者： Tie-Jian Zhu Wei Huang Qing-Nuan Li Department of Radiochemistry Shanghai Institute of Applied Physics Chinese Academy of Sciences

electrorefining of nickel in LiCl–KCl melt was investigated using electrochemical techniques. Nickel products after electrorefining were characterized by X-ray diffraction, X-ray fluorescence, and scanning electron microscopy. Both cyclic voltammetry and square wave voltammetry results suggested that Ni^2+ was directly reduced to Ni metal in LiCl–KCl. Based on a preliminary study on the electrochemical behavior of nickel and chromium, electrorefining was carried out under constant potential, whereupon deposits were formed on the cathode. The purity of nickel increased from 72.62% in the original alloy to 99.83% in cathodic deposits, as determined by inductively coupled plasma atomic emission spectroscopy analysis. Almost all the nickel in the alloy could be recovered during the electrochemical process with[90% current efficiency. A lower concentration of NiCl2 in LiCl– KCl was found to be favorable for nickel electrorefining, as increased NiCl2 concentration caused severe corrosion of the nickel anode at the gas–liquid interface due to the accumulation of Cl2 gas.

关键词： electrorefining Nickel Molten salt Alloy LiCl–KCl

Investigation on producing high purity titanium by electrorefining

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Investigation on producing high purity titanium by electrore...

Role of trivalent antimony in the removal of As, Sb, and Bi impurities from copper electrolytes

第十届中俄双边新材料新工艺研讨会

作者： LIU Meifeng,XIONG Xiaodong,LI Xiang,and LIANG Bin General Research Institute for Non-Ferrous Metals,GRIKIN Advanced Materials Co.,Ltd,Beijing 100088,China

4N5 purity titanium crystal could be produced from commercial sponge titanium by electrorefining in NaCl-KCl-TiCl-TiCl molten salt.The source and migrating of impurities was studied during electrorefining titanium.Impurity elements,such as Mg,Si,Ni, Zn,As,Ag,Sn,Sb,Pb and Fe could be effectively removed by electrolysis.However,electrolysis was only slightly useful against V and Mn impurities.One means of reducing V content was to refine sponge precursors to levels consistent with desired target purity.Mn tended to evaporate preferentially during electron beam melting.Nickel was suited for making apparatus which contact with molten salt di-recdy. Cr contamination in crystal from the cell superstructure could be multiples larger than that from sponge titanium.All inner part of electrorefining cell should be clad with nickel or titanium to produce high purity titanium.

关键词： high purity titanium electrorefining molten salt electrolysis

来源： cnki会议评论

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cnki会议

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International Journal of Minerals,Metallurgy and Materials 2013年第1期20卷 9-16页

作者： Fa-xin Xiao Dao Cao Jian-wei Mao Xiao-ni Shen Feng-zhang Ren School of Materials Science and engineering Henan University of Science and Technology Henan Key Laboratory of Advanced Nonferrous Metal Materials

The role of trivalent antimony was investigated in removing As, Sb, and Bi impurities from a copper electrolyte. Puri- fication experiments were carried out by adding a various concentrations of Sb（III） ions in a synthetic electrolyte containing 185 g/L sulfuric acid, 45 g/L Cu2＋, 10 g/L As, and 0.5 g/L Bi under stirring at 65℃ for 2 h. The electrolyte was filtered, and the structure, morphology and composition of the precipitate were analyzed by means of chemical analysis, scanning electron mi- croscopy （SEM）, X-ray diffraction （XRD）, transmission electron microscopy （TEM）, and IR spectroscopy. The precipitate is composed of irregular lumps which are agglomerated by fine dendritic and floccus particles, and it mainly consists of As, Sb, Bi, and O elements. Characteristic bands in the IR spectra of the precipitate are As-OX （X=As, Sb, Bi）, Sb-OY （Y=Sb, Bi）, O-As-O1 As-OH, Sb-OH, and O-H. The precipitate is a mixture of microcrystalline SbAsQ, （Sb,As）203, and amorphous phases. As, Sb, and Bi impurities are effectively removed from the copper electrolyte by Sb（III） ions attributing to these pre- cipitates.

关键词： copper metallurgy electrorefining electrolytes impurities removal antimony arsenic bismuth

Electrochemical processing of spent nuclear fuels:An overview of oxide reduction in pyroprocessing technology

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Progress in Natural Science:Materials International 2015年第6期25卷 572-582页

作者： Eun-Young Choi Sang Mun Jeong Korea Atomic Energy Research Institute Department of Chemical Engineering Chungbuk National University

The electrochemical reduction process has been used to reduce spent oxide fuel to a metallic form using pyroprocessing technology for a closed fuel cycle in combination with a metal-fuel fast reactor.In the electrochemical reduction process,oxides fuels are loaded at the cathode basket in molten LiO–LiCl salt and electrochemically reduced to the metal form.Various approaches based on thermodynamic calculations and experimental studies have been used to understand the electrode reaction and efficiently treat spent fuels.The factors that affect the speed of the electrochemical reduction have been determined to optimize the process and scale-up the electrolysis cell.In addition,demonstrations of the integrated series of processes(electrorefining and salt distillation) with the electrochemical reduction have been conducted to realize the oxide fuel cycle.This overview provides insight into the current status of and issues related to the electrochemical processing of spent nuclear fuels.

关键词： Pyroprocessing Electrochemical reduction electrorefining Molten salt Spent oxide fuel

CAUSE　OF　FORMATION　OF　NODULAR　COPPER　PARTICLES　ON　ELECTROREFINED　COPPER　SUBSTRATE

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中国有色金属学会会刊：英文版 1994年第4期4卷 52-55页

作者： Lin, Jianxin Li, Xueliang Chen, Hanhe He, Jianbo(Hefei Polytechnical University,Hefei 230009)Wu,Jilie (Guixi Smeltery, Guixi 335424)

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ＣＡＵＳＥＯＦＦＯＲＭＡＴＩＯＮＯＦＮＯＤＵＬＡＲＣＯＰＰＥＲＰＡＲＴＩＣＬＥＳＯＮＥＬＥＣＴＲＯＲＥＦＩＮＥＤＣＯＰＰＥＲＳＵＢＳＴＲＡＴＥ￥Ｌｉｎ，Ｊｉａｎｘｉｎ；Ｌｉ，Ｘｕｅｌｉａｎｇ；Ｃｈｅｎ，Ｈａｎｈｅ；Ｈｅ，Ｊｉａｎｂｏ（ＨｅｆｅｉＰｏｌ...

关键词： copper electrorefining nodular copper particle XPS EDAX

KINETIC　STUDY　ON　THE　REMOVAL　OF　LEAD　AND　SILVERFROMCRUDEBISMUTHBYANODEREFINING

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Journal of Central South University 1994年第1期6卷 59-62页

作者： Zhang Yongjian Ren Hongyan Xie Zhong(Department of Non-Ferrous Metallurgy, Central South University of Technology, Changsha, 410083, China) Department of Non-Ferrous Metallurgy Central South University of Technology Changsha China

ＫＩＮＥＴＩＣＳＴＵＤＹＯＮＴＨＥＲＥＭＯＶＡＬＯＦＬＥＡＤＡＮＤＳＩＬＶＥＲＦＲＯＭＣＲＵＤＥＢＩＳＭＵＴＨＢＹＡＮＯＤＥＲＥＦＩＮＩＮＧＫＩＮＥＴＩＣＳＴＵＤＹＯＮＴＨＥＲＥＭＯＶＡＬＯＦＬＥＡＤＡＮＤＳＩＬＶＥ... 详细信息

ＫＩＮＥＴＩＣＳＴＵＤＹＯＮＴＨＥＲＥＭＯＶＡＬＯＦＬＥＡＤＡＮＤＳＩＬＶＥＲＦＲＯＭＣＲＵＤＥＢＩＳＭＵＴＨＢＹＡＮＯＤＥＲＥＦＩＮＩＮＧＫＩＮＥＴＩＣＳＴＵＤＹＯＮＴＨＥＲＥＭＯＶＡＬＯＦＬＥＡＤＡＮＤＳＩＬＶＥＲＦＲＯＭＣＲＵＤＥＢＩＳＭＵＴＨ...

关键词： refine of bismuth molten salts electrorefining anode refining