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Clean production of rare earth oxide from rare earth chloride solution by electrical transformation
Hydrometallurgy ( IF 4.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.hydromet.2020.105372
Deliang Meng , Qiuyue Zhao , Xijuan Pan , Ting-an Zhang

Abstract Presently, precipitation combined with roasting is commonly applied to produce rare earth oxide from rare earth chloride solution in industry, which has environmental hazards recognizably. In this study, a cleaner approach of cationic membrane electrolysis (CME) is presented and several rare earth oxides have been successfully prepared by this method, which proves its feasibility and also provides basic research on the electrical transformation process. The experimental data indicate the La(OH)3 with hexagonal phase can be prepared, and the current efficiency and energy consumption per unit mass of La(OH)3 can reach about 97% and 2.7 kW.h.kg −1 respectively at the current density of 100 mA.cm−2. After calcining, La2O3 particles with hexagonal phase are produced, whose D50 is approximately equal to 12–22 μm. Besides, CeO2 particles with cubic phase can be formed directly using the CME method without roasting, whose D50 ranges from 12 to 23 μm. Approximate 85% of current efficiency and about 4.5 kW.h.kg −1 of energy consumption can be achieved at 0.5 mol.L−1 of CeCl3. Moreover, Nd2O3, Sm2O3, Gd2O3 and Yb2O3 are successfully prepared by the CME method, compared with the common precipitation method, it does not introduce new impurities, and has no waste liquid and exhaust gas emissions.

中文翻译:

氯化稀土溶液电转化清洁生产稀土氧化物

摘要 目前,工业上普遍采用沉淀法和焙烧法从氯化稀土溶液中制备稀土氧化物,其对环境的危害是公认的。在这项研究中,提出了一种更清洁的阳离子膜电解(CME)方法,并通过该方法成功制备了几种稀土氧化物,证明了其可行性,也为电转化过程提供了基础研究。实验数据表明可以制备六方相的La(OH)3,电流效率和单位质量La(OH)3能耗分别达到97%左右和2.7 kW.h.kg -1 100 mA.cm-2 的电流密度。煅烧后,产生六方相的 La2O3 颗粒,其 D50 约为 12-22 μm。除了,使用CME方法可以直接形成立方相的CeO2颗粒,无需焙烧,其D50范围为12至23μm。在 0.5 mol.L-1 的 CeCl3 下,可以实现大约 85% 的电流效率和大约 4.5 kW.h.kg -1 的能量消耗。此外,CME法成功制备了Nd2O3、Sm2O3、Gd2O3和Yb2O3,与普通沉淀法相比,不引入新杂质,无废液和废气排放。
更新日期:2020-11-01
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