含铜金精矿中单质硫的煤油浸取回收工艺

Process technology on recovery of sulphur from copper-bearing gold concentrate by using kerosene method

某含铜金精矿尾矿浸铜渣中含有质量分数约15%的单质硫,严重影响后续提金过程的氰化效果。实验进行了以煤油为溶剂的提硫过程研究,考察溶硫时间、温度、液固质量比等因素。实验表明:采用煤油二段浸取法,当工艺条件为液固质量比2—3,温度140℃,加热40min,单质硫的回收率为98.4%,纯度达99%以上。对硫化矿处理过程尾矿中硫的回收,采用煤油为溶媒,是一种有效、环保的清洁生产过程,可以提高贵金属及伴生硫的综合回收率,易于工业应用。

In the residues of copper-bearing gold concentrate there is mass fraction 15% sulfur which influences the effect of latish cyanogenation. The experiment was carried out with kerosene as solvent in sulfur removal process and the effect of leaching temperature and time, the mass ratio of kerosene to residue （liquid to solid） on the experiment was investigated. The results show that when the mass ratio of kerosene to residue is 2-3, heating temperature is 140 ℃, heating time is 40 min, the recovery efficiency of sulfur can be more than 98.4%, the purity of sulfur can be more than 99%. The new hydrometallurgical method which uses kerosene as solvent is an effective and clean process. It can improve comprehensive recovery efficiency of precious metals and sulfur, and is easy for industrialization without pollution.