CAJ | 학술논문

采用湿法冶金技术开展了对废旧镍氢电池中稀土元素的回收研究,考察了废旧镍氢电池负极材料在硫酸溶液中的溶解条件,当硫酸浓度为4 mol/L,溶解时间为3 h时,稀土元素的溶出率最高。研究了在溶出液中稀土元素与无水硫酸钠形成稀土复盐的条件,当无水硫酸钠与稀土元素的摩尔比为5∶1,沉淀温度为60℃时,稀土元素的回收率最高,分别利用SEM、XRD和XPS对所得产品进行了表征,SEM图谱表明所得到的稀土复盐为分散性较好的尖晶石结构；XRD分析表明所得产品与NaLa （SO4）2·H2O标准图谱一致；XPS表明产品中所含主要稀土元素为La,与XRD分析结果一致。
채용습법야금기술개전료대폐구얼경전지중희토원소적회수연구,고찰료폐구얼경전지부겁재료재류산용액중적용해조건,당류산농도위4 mol/L,용해시간위3 h시,희토원소적용출솔최고。연구료재용출액중희토원소여무수류산납형성희토복염적조건,당무수류산납여희토원소적마이비위5∶1,침정온도위60℃시,희토원소적회수솔최고,분별이용SEM、XRD화XPS대소득산품진행료표정,SEM도보표명소득도적희토복염위분산성교호적첨정석결구；XRD분석표명소득산품여NaLa （SO4）2·H2O표준도보일치；XPS표명산품중소함주요희토원소위La,여XRD분석결과일치。
Recovery of rare earth from anode material of waste Ni-MH battery with hydrometallurgical methods was studied in this paper.The anode material of waste Ni-MH battery was dissolved in sulfuric acid,and the dissolution conditions were optimized.The experimental results showed the leaching rate reach the optimum when the concentration of sulfuric acid and reaction time were 4 mol/L and 3 h,respectively.The conditions of the formation of rare earth double salt were also studied,the optimum mole ratio between sodium sulfate and rare earth was 4∶1,and the precipitate temperature was 60 ℃.The rare earth precipitate products were characterized by SEM,XRD and XPS. The construction of the precipitate was spinel structure with good dispersity,the XRD spectrogram was matching well with NaLa (SO4)2·H2O,and XPS result showed that the main rare earth element was La,which was well agreement with the XRD result.