(廣東省稀有金屬研究所 廣東省稀土開發(fā)及應(yīng)用重點(diǎn)實(shí)驗(yàn)室，廣州 510650)
摘 要: 針對(duì)溶液中Eu3+離子難還原等問(wèn)題，采用離子膜電解法對(duì)溶液中Eu3+的還原進(jìn)行試驗(yàn)研究，考察不同陰、陽(yáng)電極材料，陽(yáng)極液、陰極液成份及酸度，電流密度等工藝條件對(duì)Eu3+還原的影響，確定最佳工藝參數(shù)。結(jié)果表明：釕系多元混合物涂層鈦陽(yáng)極、金屬鈦陰極，陽(yáng)極液為含1 mol/L鹽酸溶液的氯化鈣溶液、陰極液為富銪料液，電流密度為500 A/m2時(shí)，經(jīng)過(guò)7.5 h，Eu3+的電解還原率大于95.5%，電解還原電流效率大于80%，槽電壓穩(wěn)定，無(wú)銪損失；經(jīng)過(guò)工業(yè)化連續(xù)運(yùn)行，Eu3+的電解還原率大于94%。
關(guān)鍵字: 稀土；離子膜電解；還原；銪
（Guangdong Province Research Institute of Rare Metals,
Guangdong Province Key Laboratory of Rare Earth Development and Application, Guangzhou 510650, China）
Abstract:Electrolysis of Eu3+ solution using ion-exchange membrane was studied to achieve the reduction of Eu3+. Effects of electrode type (anode and cathode), electrolyte composition (anode and cathode electrolyte), acidity and electrolytic process parameters on reduction of Eu3+ were investigated. The favored conditions were determined. The result shows that ruthenium based multi-component mixture coated titanium anode, Ti cathode, calcium chloride solution containing 1 mol/L hydrochloric acid anolyte, rich europium compound catholyte, current density of 500 A/m2, electrolysis time of 7.5 h. The best result of Eu3+ reduction rate could be as high as 95.5% and the current efficiency is more than 80% in this work, below the premise of stable cell voltage and no loss of europium. Moreover, reduction rate of Eu3+ is more than 94% in continuous industrial operation.
Key words: rare earth; ion-exchange membrane electrolysis; reduction; europium
