Anode processes for Nd electrowinning from LiF-NdF3-Nd2O3 melt

被引：22

作者：

Liu, Shizhe ^{[1
]}

Chen, Lingyun ^{[1
]}

Li, Bing ^{[1
]}

Wang, Liangliang ^{[2
]}

Yan, Bo ^{[2
]}

Liu, Mugen ^{[2
]}

机构：

[1] E China Univ Sci & Technol, Shanghai 200237, Peoples R China

[2] XuZhou JinShiPengYuan Rare Earth Mat Factory, Xuzhou 221611, Jiangsu, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2014年 / 147卷

基金：

中国国家自然科学基金;

关键词：

anode processes; Nd electrowinning; oxygen ions; flouride ions; cirtical potential;

D O I：

10.1016/j.electacta.2014.09.005

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Cyclic voltammetry was applied to characterize oxidation processes of oxygen ions and fluoride ions on a graphite electrode in LiF-NdF3-Nd2O3 melt. The effects of the concentration of Nd2O3, temperature, electrode area on the oxidation of oxygen ions and critical potential have been discussed. Oxidation processes of oxygen ions include adsorption and gas evolution of oxidation products, which is proved by the the smooth and fluctuant cyclic voltammograms. During adsorption process, both the peak current density and the peak potential of oxidation of oxygen ions increase with the increase of Nd2O3 concentration. The peak current density of oxidation of oxygen ions displays a linearity within 2.5wt% Nd2O3 in the melt. The kinetics of the oxidation of oxygen ions is controlled by both electrochemical reaction step and mass transfer. During gas evolution, the oxidation process of oxygen ions is controlled by electrochemical reaction step. Oxidation of flouride ions starts from the critical potential. The critical potential by reverse scan is independent of the electrode area, but depends on electrode area by positive scan. Increasing temperature causes significantly increased the adsoprtion current density for oxidation of oxygen ions. At 950 degrees C, after the critical potential relatively big current peaks involving formaiton of perflouride compounds occurs after the cirtical potential. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：82 / 86

页数：5

共 9 条

[1]

Dolin E. J., 1999, LIGHT MET AGE, P56

[2]

Li B., 2014, RARE METAL TECHNOLOG, P95

[3]

Nissen SS, 1997, LIGHT METALS 1997, P159

[4]

Wang GH, 2007, J RARE EARTH, V25, P533

[5]

Yan S., 2011, CHINESE J RARE EARTH, P442

[6]

Zhu H., 2014, Rare Earth Metal Production by Molten Salt Electrolysis, P1765

[7]

Zhu HM, 2001, LIGHT MET, P303

[8]

Zhu HM, 1999, LIGHT METALS 1999, P241

[9]

Zhu HM, 2000, LIGHT METALS 2000, P257

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