( 1. 內(nèi)蒙古科技大學(xué) 材料工程學(xué)院， 包頭 014030; 2. 中南大學(xué) 冶金分離科學(xué)與工程研究所， 長沙 410083)
摘 要: 利用陰陽離子交換膜變電流電解方法， 研究了改變電流密度條件下將混合硫酸稀土溶液中Ce(Ⅲ)電解氧化為Ce(Ⅲ)時， 電流密度和電解時間對陽極電流效率和Ce(Ⅲ)氧化率的影響。 結(jié)果表明： 陰離子交換膜體系中， 在相同電解電量條件下， 電流效率和氧化率隨平均電流密度升高而降低； 當(dāng)電流效率達(dá)到80%時， 電流密度和鈰離子濃度有線性關(guān)系； 平均電流密度為325 A/m2的電流密度組合有較高的電流效率和氧化率； 電解時間相同時， 每一個電流密度電解時間越短， 越有利于提高電流效率， 電解后期適當(dāng)延長低電流密度電解時間可以使Ce(Ⅲ)的氧化率達(dá)到99%； 在陽離子交換膜電解體系中， 電流效率達(dá)到80%時， 電流密度和Ce3+離子濃度無線性關(guān)系。
關(guān)鍵字: 電解； 氧化； 鈰； 離子交換膜
mixed rare earths sulfurate solution by changing current density
（ 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
