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

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 chloride solution on electrolytic product was mainly investigated. The phase c...

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Bibliographic Details
Published in:Journal of rare earths 2019-09, Vol.37 (9), p.1009-1014
Main Authors: Meng, Deliang, Zhao, Qiuyue, Pan, Xijuan, Zhang, Ting'an
Format: Article
Language:English
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Summary: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 chloride 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 °C 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%. Additionally, the prepared La2O3 particles are porous and non-spherical particles, which are composed of small crystals with sheet structure. The product formed by electrolysis of LaCl3 aqueous solution directly is La(OH)3, after calcining, La2O3 is obtained eventually. The produced gases (Cl2 and H2) are of high purity, which can be collected respectively, and used as value-added products or further synthesis of hydrochloric acid (HCl). The hydrochloric acid and the used electrolyte can be returned to the total production process of rare earth to achieve the purpose of recycling. [Display omitted]
ISSN:1002-0721
2509-4963
DOI:10.1016/j.jre.2018.11.017