硫化焙烧法回收高炉含锌粉尘中的锌

摘要

With elemental sulfur as vulcanizing agent and blast furnace dust of iron and steel mak -ing plant as the research object , the process ofsulfidationroasting was adopted toward the conversion of zinc oxide into zinc sulfide for subsequent zinc recovery through conventional floatation .The roasting factors including preheating time ,roasting temperature,roasting time, sulfur amount were investigated .The experimental results showedthe optimum process parameters were that under the conditions ofadding 20%sulfur,preheating 60 min at 400 ℃,roasting 60 min at 750 ~850℃,the sulfidation rate of Zn was 91 .59%.A flotation concentrate wasobtained with 62 .8%Zn from the materials which was treated by sulfidation , and the recovery of Zn was 84.76%.%以硫磺为硫化剂对某钢铁厂高炉粉尘采用硫化焙烧技术，使高炉粉尘中的氧化锌转变为硫化锌，并用浮选法回收锌。试验主要考察了预热时间、反应时间、反应温度、硫磺用量对锌回收的影响。试验结果表明，最佳工艺参数为：预热温度400℃，预热时间60 min，反应温度750～850℃，反应时间60 min，硫磺用量20％。在此条件下，锌硫化率可达91．59％，经过浮选得到锌精矿品位67．80％，回收率58．84％。