锌加压酸浸渣中硫磺的回收方法研究

Recovery of Elemental Sulfur from Zinc Pressure Acid Leaching Residue

对比分析了浮选法、热过滤法和硫化铵法回收锌加压酸浸渣中硫磺的优缺点。考察了硫化铵溶液浸出浮选硫精矿、硫化物滤饼和多硫化铵母液热分解过程的影响因素。结果表明,液固比和硫化铵浓度对硫磺浸出效果影响较为明显,在最佳试验条件下硫化物滤饼中硫的浸出率约为95%,浮选硫精矿中硫的浸出率和回收率均达到98%,多硫化铵母液热分解后获得的硫磺产品纯度高达99.57%。硫化铵浸出渣中有价金属富集倍数较高,有利于锌加压酸浸渣的综合利用。

Advantages and disadvantages to recover elemental sulfur from zinc pressure acid leaching residue by flotation method,melting and filtration method,ammonium sulfide method is contrastively analyzed.Effects of different factors on leaching process of flotation sulfur concentrate and sulfide filter cake with ammonium sulfide,and on thermal decomposition process of polysulfide solution were analyzed.The results indicate that ratio of liquid to solid and concentration of ammonium sulfide have significant impact on sulfur leaching rate.Sulfur leaching rate from sulfide filter cake is about 95%under optimal conditions.Sulfur leaching rate and recovery from flotation sulfur concentrate is 98%.Purity of sulfur obtained by thermal decomposition of ammonium polysulfide solution is 99.57%.Content of valuable metals in residue after sulfur extraction is enriched by remarkable times,which is favorable for comprehensive utilization of zinc pressure acid leaching residue.