从盐酸BiCl_3溶液中隔膜电积回收铋的研究

Study on Recovery Bismuth by Diaphragm Electrolysis from Hydrochloric BiCl_3 Solution

介绍了一种回收铋的清洁湿法冶金新工艺，运用隔膜电积法从盐酸BiCl 3溶液中回收铋，并考察了电流密度、温度、HCl、Bi3＋和NaOH的浓度对电积的影响。结果表明：在电流密度150 A／m2、温度45～55℃、3．5 mol／L HCl、110 g／L Bi3＋、15 g／L NaOH的最佳条件下，阳极NaOH反应生成NaClO3，Bi3＋在阴极上沉积得到致密金属铋，电流效率最高可达到98．82％，阴极铋纯度为99．80％。电积后将阳极和阴极电积液返回循环利用，实现了物料的闭路循环。

This paper introduces a new clean hydrometallurgy technology of recovery bismuth from hydrochloric BiCl 3 solution by electrodeposition .Effects of current density , solution temperature , concentration of HCl , Bi3＋and NaOH parameter on diaphragm were investigated .The experiments results show that , in the optimum conditions of current density 150 A/m2, temperature 45~55℃, 3.5 mol/L HCl, 110 g/L Bi 3＋and 15 g/L NaOH.NaOH could transform into NaClO 3 through re-action in anode , bismuth could be obtained in cathode , current efficiency could reach a maximum of 98 .82 %, and the purity of cathodes bismuth was 99 .8%.The electric fluid of anode and cath-ode could be recycled , and which achieves closed circulation of materials .