从黄铜矿酸浸渣中回收硫磺的工艺研究

Technical Study on Recovery of Sulfur from Copper Pyrites Residue Leached by Acid

对黄铜矿酸浸渣中硫磺回收工艺进行研究,分析了浸取温度、反应时间、液固比、热分解温度、热分解时间等因素对硫磺回收率的影响.实验结果表明,在(NH4)2S浓度为2.0mol/L、溶硫温度30℃、反应时间60min、液固比8∶1、热分解温度90℃、时间90min的条件下,采用硫化铵法回收硫磺,溶硫率达到96%左右,热分解提硫率达到94%以上.

There is about 15% sulphur in the residue of copper pyrites. Low cost process of extracting sulfur from the residue is important not only the impact of commercial consideration but also critical for the environment. In this work, the operation conditions such as leaching temperature, reaction time, the ratio of ammonium sulfide to solid residue, and duration and temperature of thermal decomposition for extracting sulfur from residue of copper pyrites were investigated in the use of ammonium sulfite solution. The re- sults show that the process can extract sulfur from leaching residue in the measurement of achieving about 96 % leaching efficiency extraction at the conditions of ammonium sulfide concentration 2.0 mol/L,temperature 30℃ ,reaction time 60 rain,ratio of ammonium sulfide to solid residue 8 ： 1. And the thermal decomposition can reach 94 % at temperature of thermal decomposition 90℃, and duration of thermal decomposition 90 min.