中文摘要：

介绍了一种辉铋矿湿法清洁冶金新工艺。新工艺包括浸出、净化、隔膜电积3个主要工序。铋电积后,在阴、阳极室分别得到金属铋和NaClO3,NaClO3可作为氧化剂返回浸出,实现流程的闭路循环。试验优化了盐酸浸出和隔膜电积参数,研究了阴极电解液中铋和氯化钠质量浓度、温度、电流密度等对电沉积铋时电流效率的影响。结果表明：在阴极电解液组成为70g/L Bi、25g/L NaCl、4.5mol/L HCl和阳极电解液组成为25g/L NaOH、电流密度200A/m2、温度55℃条件下进行电积,阴极电流效率大于97%且阴极铋的纯度达到99.98%;从阳极室得到的浓缩盐经XRD分析确定为纯氯酸钠,这些氯酸钠可以在浸出过程中作为氧化剂循环使用。

英文摘要：

Separating and recovery bismuth from a bismuthinite concentrate by a process of leaching—purification—electrowinning process.The process parameters for hydrochloric acid leaching and membrane-electrowinning were optimizated.The effect of prameters such as concentration of bismuth and sodium chloride in catholyte,temperature,current density etc.on current efficiency of electro-deposition was examined.A maximum current efficiency of more than 97% was attained using catholyte compositing of 70 g/L Bi,25 g/L NaCl,4.5 mol/L HCl and anolyte compositing of 20 g/L NaOH at 55 ℃ and cathode current of 200 A/m2.Under the optimized conditions,the cathode bismuth purity was of 99.98%.The condensed salt obtained from the anolyte was pure sodium chlorate which can be recycled to leach.