钼铋混合精矿盐酸浸出分离并制备海绵铋工艺研究

Oxygen⁃Rich Hydrochloric Acid Leaching Process for Mo⁃Bi Bulk Concentrate

针对钼铋混合精矿进一步分选流程长、成本高以及传统火法炼铋工艺冗长、能耗高、铋回收率偏低等问题,采用通氧盐酸浸出新工艺,考察了盐酸浓度、浸出时间、温度等因素对钼铋浸出的影响,在盐酸浓度3 mol/L、液固比3∶1、温度80℃、搅拌转速500 r/min优化条件下通氧气浸出6.0 h,铋浸出率达99.13%,钼不浸出富集于浸出渣中,实现了铋和钼的高效分离;浸出液经净化除杂及铁板置换后得到了纯度99%以上的海绵铋。

Mo⁃Bi bulk concentrate is usually processed with a longer flowsheet at higher cost,and the traditional bismuth smelting processing technique also features longer flow,high energy consumption,as well as lower bismuth recovery.In order to solve those problems,an oxygen⁃rich hydrochloric acid leaching process was adopted in an experimental study on beneficiation of Mo⁃Bi bulk concentrate,and the effects of HCl concentration,leaching time and temperature on the leaching rates of Mo and Bi were investigated.It is shown that oxygen⁃rich hydrochloric acid leaching at 80℃for 6.0 h,with HCl concentration of 3 mol/L,liquid/solid ratio of 3∶1,and stirring speed of 500 r/min,can result in the Bi leaching rate up to 99.13%and Mo left in the leaching residue.Thus,molybdenum and bismuth can be efficiently separated.The obtained leaching solution is then subjected to purification for purity removal and replacement with iron plate,and the finally obtained sponge bismuth can have purity exceeding 99%.