两段旋流电积法提纯粗铟

Purification of crude indium by two-stage cyclone electrowinning

采用两段旋流电积工艺对粗铟进行提纯。根据线性扫描伏安法(LSV)研究结果及对扩散系数(D=6.15×10^(-11)cm^(2)·s^(-1))的评估可知,硫酸铟溶液中铟电沉积是受扩散控制的不可逆过程,可通过加强电解质流动强化液相传质。在第一段旋流电积提纯粗铟的最佳工艺条件下,电流效率达80.15%,单位能耗为2.11 kW·h/kg,平均槽电压为2.04 V,粗铟纯度由94.34%提升至99.95%。在第二段旋流电积提纯粗铟的最佳工艺条件下,电流效率为75.23%,单位能耗为2.23 kW·h/kg,平均槽电压为2.40 V,产品纯度为98.95%。经过二段旋流电积后,铟综合回收率高达98.22%。

A possible process for the purification of crude indium by two-stage cyclone electrowinning was proposed.In accordance with a linear sweep voltammetry(LSV)results and the evaluation of the diffusion coefficient(D=6.15×10^(−11)cm^(2)/s),indium electrodeposition in In_(2)(SO_(4))_(3)solution was controlled by a diffusion-controlled irreversible process,and mass transfer can be significantly enhanced by electrolyte flow.During the 1st-stage indium cyclone electrowinning,a current efficiency(CE)of 80.15%,specific energy consumption(SEC)of 2.11 kW·h/kg and average cell voltage(ACV)of 2.04 V were achieved under the optimum conditions.Meanwhile,the purity of indium increased from 94.34%to 99.95%.During the 2nd-stage indium cyclone electrowinning,98.95%purity of cathode indium was conducted by electrowinning under the optimum conditions,while the CE,SEC,and ACV were 75.23%,2.23 kW·h/kg and 2.40 V,respectively.After two-stage cyclone electrowinning,the comprehensive recovery of indium is as high as 98.22%.