Preparation of La2O3 by ion-exchange membrane electrolysis of LaCl3 aqueous solution
来源期刊：JOURNAL OF RARE EARTHS2019年第9期
论文作者：Deliang Meng Qiuyue Zhao Xijuan Pan Ting’an Zhang
文章页码：1009 - 1014
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 10-20 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.
Deliang Meng，Qiuyue Zhao，Xijuan Pan，Ting’an Zhang
Key Laboratory of Ecological Metallurgy of Multi-Metal Intergrown Ores of Ministry of Education,School of Metallurgy,Northeastern University
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 10-20 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.
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