Preparation of La2O3 by ion-exchange membrane electrolysis of LaCl3 aqueous solution  

作　　者：Deliang Meng Qiuyue Zhao Xijuan Pan Ting’an Zhang 

机构地区：[1]Key Laboratory of Ecological Metallurgy of Multi-Metal Intergrown Ores of Ministry of Education,School of Metallurgy,Northeastern University

出　　处：《Journal of Rare Earths》2019年第9期1009-1014,I0005,共7页稀土学报（英文版）

基　　金：Project supposed by National Key R&D Program of China(2017YFC0210403-04;2017YFC0210404);Liaoning Excellent Talent Cultivation Project(2015020591);the Young Creative Talents Project of Ordinary University in Guangdong Province(2015KQNCX157);Hi-Tech Research and Development Program(863)of China(2010AA03A405)

摘　　要：The ion-exchange membrane electrolysis technology was applied inventively in the preparation of lanthanum hydroxide,after calcination,lanthanum oxide was obtained eventually.The effect of the concentration of lanthanum chlo ride solution on electrolytic product was mainly investigated.The phase composition,micro morphology,particle size and chlorine content of the product were characterized,respectively.Under the conditions of this work,the product that forms by electrolysis of LaCl3 aqueous solution directly is La(OH)3.When the initial concentration of LaCl3 changes from 0.1 to 0.5 mol/L,the current efficiency of La(OH)3 increases from 60%to 85%,the product roasted at 800℃for 1.5 h is La2O3,whose median particle size(D50)is 10-20μm,the mass fraction of chloride ion is less than 0.02 wt%.Additio nally,the prepared La2O3 particles are porous and non-spherical particle s,which are composed of small crystals with sheet structure.The ion-exchange membrane electrolysis technology was applied inventively in the preparation of lanthanum hydroxide, after calcination, lanthanum oxide was obtained eventually. The effect of the concentration of lanthanum chlo ride solution on electrolytic product was mainly investigated. The phase composition, micro morphology, particle size and chlorine content of the product were characterized,respectively. Under the conditions of this work, the product that forms by electrolysis of LaCl3 aqueous solution directly is La（OH）3. When the initial concentration of LaCl3 changes from 0.1 to 0.5 mol/L, the current efficiency of La（OH）3 increases from 60% to 85%, the product roasted at 800 ℃ for 1.5 h is La2O3,whose median particle size(D50) is 10-20 μm, the mass fraction of chloride ion is less than 0.02 wt%.Additio nally, the prepared La2O3 particles are porous and non-spherical particle s, which are composed of small crystals with sheet structure.

关 键 词：LANTHANUM chloride Membrane ELECTROLYSIS LANTHANUM HYDROXIDE LANTHANUM oxide Current efficiency Rare earths 

分 类 号：TF[冶金工程]