电解精炼制备高纯铟的电化学行为研究  

Study On Electrochemical Behavior of High Purity Indium by Electrolytic Refining

作　　者：陈丽诗 伍美珍 雷云 卢兴伟 Chen Lishi;Wu Meizhen;Lei Yun;Lu Xingwei(Yunnan Tin Group(Holding)Company Limited R&D Center Kunming,Yunnan,China)

机构地区：[1]云南锡业集团(控股)有限责任公司研发中心,云南昆明650000

出　　处：《矿产综合利用》2020年第3期174-179,共6页Multipurpose Utilization of Mineral Resources

摘　　要：考察了铟电解精炼中铟离子浓度以及氯化钠浓度对铟电解的电化学行为影响,并运用X射线衍射(XRD)、X射线能谱仪(EDS)分析了阳极异常产物。结果表明,当铟离子浓度为70 ~80 g/L、NaCl浓度为100 g/L、电解液pH值为2~2.5、电流密度为55 A/m2时,经辉光放电质谱(GD-MS)检测分析得铟的主含量达到99.9997%以上,各杂质均达到5N高纯铟YS/T 264-2012的标准。当铟离子浓度大于100 g/L时,阳极铟在溶解时有少量以In+的形式进入溶液,在阳极板上发生歧化反应生成黑色海绵铟;同时阳极板上析出的白色物质主要为InOHSO4 (H2O)2,由于In3+浓度过高水解沉淀析出,使电解液条件恶化阴极产品质量不达标。The effects of indium ion concentration and sodium chloride concentration on the electrochemical behavior of indium electrorefining were studied.Meanwhile,X-ray diffraction(XRD)and X-ray energy spectrometer(EDS)were used to analyze the products under the abnormal behavior of the anode.The results show that when the concentration of indium ion is 70~80 g/L,NaCl concentration is 100 g/L,electrolyte pH is 2~2.5 and current density is 55 A/m2,the main content of indium can reach more than 99.9997%by glow discharge mass spectrometry(GD-MS),and other impurities can reach the standard of 5N high purity indium YS/T 264-2012.Moreover,when the concentration of indium ion is more than 100 g/L it was found that disproportionation reaction occurs on the anode plate to produce black sponge indium.And a small amount of indium anode enters the solution in the form of In+during it dissolves.On the other hand,the white substance precipitated from the anode plate is mainly InOHSO4(H2O)2,which is hydrolyzed and precipitated due to the excessive concentration of In3+and deteriorates the electrolyte condition and the cathode product.

关 键 词：高纯铟 电解精炼 异常行为 电化学行为 

分 类 号：TD989[矿业工程—选矿]