用隔膜电积法从辉铋矿精矿中回收铋  

Recovery of Bismuth From A Bismuthinite Concentrate by Membrane-electrowinning

作　　者：王继峰 李静[2] 杨建广[1,2] 

机构地区：[1]广西堂汉锌铟股份有限公司博士后科研工作站,广西南丹547204 [2]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《湿法冶金》2012年第1期45-48,52,共5页Hydrometallurgy of China

基　　金：国家自然科学基金资助项目(50804056);中国博士后科学基金资助项目(20080431028);中国科技部"十一五"科技支撑计划资助项目(2006BAB02B05-04-01/02)

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。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.

关 键 词：辉铋矿 氯化浸出 电沉积 铋 清洁工艺 

分 类 号：TF817[冶金工程—有色金属冶金]