电极液酸度及稀土浓度对硫酸体系电解还原提纯镱的影响  

Acidity and Rare Earth Concentration Effects on Ytterbium Purification by an Electrolysis Reduction in H_2SO_4 Medium

作　　者：张玻[1] 贾江涛[1] 廖春生[1] 严纯华[1] 

机构地区：[1]北京大学稀土材料化学及应用国家重点实验室

出　　处：《中国稀土学报》2006年第1期116-119,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金资助项目(20371003&20221101)

摘　　要：研究了在硫酸体系中,采用钌铱钛合金网为阳极,金属汞为阴极,在无惰性气氛的保护下,尝试电解还原镱,在诸多电极条件实验中着重研究了阳极液酸度、阴极液酸度以及料液浓度变化时电流、目标离子的还原率等电解还原过程的变化。研究表明,当阳极液酸度为2.0 mol.L-1,阴极液pH=0.3,阴极液稀土料液浓度为0.5 mol.L-1时,镱的还原率可达95%以上,硫酸镱纯度达到99%以上,稀土总回收率高于99%。Ytterbium purification by an electrolysis reduction in sulfuric acid medium was investigated without nitrogen or argon protection, in which Ru-Ir-Ti alloy nets and mercury were used as anode and cathode, respectively. How the conditions such as the acidities of cathode and anode solutions, and the concentration of Yb（Ⅲ） to affect the circuit aod ratio of Yb（Ⅱ）/Yb （Ⅲ） in electrolysis reduction were studied. The optimal conditions are as follows： the acidities and anode solutions are 2.0 mol·L^-1 and p spectively, and the concentration of Yb （Ⅲ） is anode solution is 0.5 mol·L^-1 Under the optimal condition, the ruductivity and purity of Yb （Ⅲ ） are higher than 95% and 99%, respectively. The recovery of rare earths is higher than 99%.

关 键 词：酸度 稀土浓度 硫酸体系 电解还原 镱 

分 类 号：TQ246.35[化学工程—有机化工] TQ226.36