低品位铋多金属精矿加压碱浸分离钼、钨、硫和铋

Separation of Mo,W,S and Bi from Low-grade Bismuth Polymetallic Concentrate by Pressure Alkali Leaching

针对传统铋精矿冶炼原料适应性差、不适于低品位铋精矿、有价金属综合回收率低、火法冶炼产生低浓度SO_(2)治理难、成本高等问题,以柿竹园低品位铋多金属精矿为原料,提出加压氧化碱浸分离钼、钨、硫和铋的新工艺,研究了碱用量、时间、温度、总压及液固比等因素对钼、钨、硫、铋浸出率的影响。在优化工艺条件下,钼、钨、硫的浸出率分别达99.73%、90.81%和97.69%,铋不浸出在渣中富集,实现了低品位铋多金属精矿中钼、钨、硫与铋的高效分离。

Address to poor adaptability of traditional smelting methods to raw materials like bismuth concentrate,especially unsuitable for low-grade bismuth concentrate,low comprehensive recovery rate of valuable metals,difficult treatment of low concentration SO_(2) produced by pyrometallurgy,and high cost,a new process for separating molybdenum,tungsten,sulfur and bismuth by pressure oxidation alkaline leaching was proposed using low grade bismuth polymetallic concentrate of Shizhuyuan as raw material.The effects of alkali dosage,time,temperature,total pressure and liquid-solid ratio on the leaching rate of molybdenum,tungsten,sulfur and bismuth were studied.Under the optimum conditions,the leaching rate of molybdenum,tungsten and sulfur is 99.73%,90.81%and 97.69%respectively,while bismuth remains un-leached and is enriched in the slag,which realizes the efficient separation of molybdenum,tungsten,sulfur and bismuth in low-grade bismuth polymetallic concentrates.