从铜尾矿中回收铋金属选矿试验

摘要

A bismuth concentrate with a grade of only 3.94％ was obtained by the preliminary enrichment of the tailings after copper separation from copper-bismuth ore.The bismuth in the sample exists in a form of tiny native bismuth according to occurrence-state and microstructure analysis,the amount of bismuth associated with or included in other minerals being about 59.15％,this part of bismuth belongs to refractory bismuth.The influence of grinding fineness and regime of reagents on flotation indexs were analyzed according to the ore properties.A bis muth concentrate with grade of 25.06％ and recovery of 77.31％ was obtained by a flotation process of one stage roughing,two stage scavenging and three stage cleaning.X-ray diffraction analysis on the concentrate shows that the composition of the concentrate is rather complex,except native bismuth,there are other minerals containing bismuth,and this parts of minerals are mainly galena.%某铜铋矿选铜后的尾矿经初步富集得到品位仅为3.94％的铋粗精矿,通过对铋的赋存状态以及显微结构进行分析,发现矿样中的铋以细粒自然铋的形式存在,同时,大量自然铋与其它矿物伴生或包裹,这部分铋占到总量的59.15％,属于难选铋.针对该矿石的性质,研究了磨矿细度以及药剂制度对浮选指标的影响,确定了“一次粗选、两次扫选、三次精选”的试验流程,最终获得品位为25.06％,回收率为77.31％的铋精矿.对精矿进行X射线衍射分析,结果表明,精矿组成复杂,除了自然铋外,还存在包裹铋的其它矿物,这部分矿物以方铅矿为主.