Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第14卷    第11期    总第68期    2004年11月

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文章编号: 1004-0609(2004)11-1963-06
变电流电解氧化混合硫酸稀土溶Ⅲ液中的Ce(Ⅲ)
魏琦峰1, 张启修2

( 1. 内蒙古科技大学 材料工程学院, 包头 014030; 2. 中南大学 冶金分离科学与工程研究所, 长沙 410083)

摘 要: 利用阴阳离子交换膜变电流电解方法, 研究了改变电流密度条件下将混合硫酸稀土溶液中Ce(Ⅲ)电解氧化为Ce(Ⅲ)时, 电流密度和电解时间对阳极电流效率和Ce(Ⅲ)氧化率的影响。 结果表明: 阴离子交换膜体系中, 在相同电解电量条件下, 电流效率和氧化率随平均电流密度升高而降低; 当电流效率达到80%时, 电流密度和铈离子浓度有线性关系; 平均电流密度为325 A/m2的电流密度组合有较高的电流效率和氧化率; 电解时间相同时, 每一个电流密度电解时间越短, 越有利于提高电流效率, 电解后期适当延长低电流密度电解时间可以使Ce(Ⅲ)的氧化率达到99%; 在阳离子交换膜电解体系中, 电流效率达到80%时, 电流密度和Ce3+离子浓度无线性关系。

 

关键字: 电解; 氧化; 铈; 离子交换膜

Electro-oxidation of Ce(Ⅲ) in
 mixed rare earths sulfurate solution by changing current density
WEI Qi-feng1, ZHANG Qi-xiu2

1. College of Material Engineering,
Inner Mongolia University of Science and Technology,
 Baotou 014030, China;
2. Institute of Metallurgy Separation Science and Engineering,
Central South University, Changsha 410083, China

Abstract: The effect of current density and electrolysis time on anode current efficiency and oxidation rate for electro-oxidizing Ce(Ⅲ) in sulfuric acid with changing current density was studied in the system of anion and cation exchange membrane. The results indicate that the current efficiency and oxidation rate decrease with the increase of average current density under the same electrolysis coulomb in the system of anion exchange membrane. The current density has the linearity relationship with the concentration of Ce(Ⅲ). There are high current density and high oxidation rate under average current density combination of 325 A·m-2, meanwhile oxidation velocity is more rapid. The more shorter electrolysis time for every current density, the more higher current efficiency and oxidation rate. The oxidation rate and current efficiency could reach up to 99% and 80% above respectively under the appropriate long electrolysis time of low current density. The current density does not have the linearity relationship with the concentration of Ce(Ⅲ) in the system of cation exchange membrane electrolysis. 

 

Key words: electrolysis; oxidation; cerium; ion-exchange membrane

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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