从硫化锌氧压酸浸渣中提取硫磺的工艺研究

Recovery Sulfur from Oxygen Pressure Acid Leaching Residue of ZnS

采用硫化铵法从硫化锌氧压酸浸渣中回收单质硫,分别考察了在浸出过程中硫化铵浓度、浸出时间、液固比与浸出温度对硫浸出率的影响和蒸馏过程中蒸馏温度与保温时间对硫析出率的影响,从而得到回收硫磺的最佳工艺参数:硫化铵浓度2.5 mol/L,浸出时间10 min,液固比6:1,浸出温度25℃;蒸馏温度90℃,蒸馏保温时间30 min。在此工艺条件下进行全工艺条件实验,结果表明硫磺回收率在95.8%以上,硫磺纯度在99.16%以上且质量符合GB/T 2449—2006工业硫磺合格品标准。

Recovery of elemental sulfur was adopted by ammonium sulfide method from oxygen pressure acid leaching residue of ZnS.Effects of（NH4）2S concentration,leaching time,leaching liquid-solid ratio and leaching temperature on leaching process and effects of distillation temperature and distillation holding time on distillation process were discussed.Comprehensive experimental results verified that the optimum parameters of sulfur recovery：（NH4）2S concentration of 2.5 mol/L,leaching time of 10 min,leaching liquid-solid ratio of 6：1,leaching temperature of 25 ℃,distillation temperature of 90 ℃and distillation holding time of 30 min.Experiments show that total sulfur recovery rate attain 95.8% or more.The purity of sulfur obtained under optimum conditions can reach 99.16% or more and the quality of sulfur accords with the GB/T 2449—2006 industrial qualified standard.