河北某铁矿混磁精反浮选工艺优化

Reverse Flotation Process Optimization of Mixed Magnetic Concentrate from a Iron Mine of Hebei

河北某铁矿混磁精反浮选精矿指标较差,主要是由于铁矿物单体解离不充分和反浮选效果不理想造成。为提高反浮选提铁降硅效果,改善分选指标,对现场混磁精进行了反浮选工艺技术研究。结果表明:在磨矿细度为-0.043 mm占80.48%的情况下,采用1粗1精2扫、中矿顺序返回流程处理,最终获得了铁品位为63.98%、铁回收率为81.60%的铁精矿;与现场工艺相比,新工艺增加了混磁精再磨作业,精选和扫选次数各减少了1次,精矿铁品位和铁回收率分别提高了1.70和11.01个百分点,选矿指标改善显著。

Indicators of reverse flotation concentrate from mixed magnetic concentrate from a Iron Mine of Hebei prov- ince, are not satisfactory, mainly due to inadequate monomer dissoeiatlon and unsatisfactory reverse flotation performanee. On- site mixed magnetic iron concentrate was treated by reverse flotation in order to increase effect of iron increase and silicon re- duction operation. The results showed that iron concentrate with iron grade of 63.98% and iron recovery of 81.60% was gaind at the grinding fineness of 80.48% passing 0.043 mm through the process of one roughing,one cleaning,two scavenging,and middles back to the flowsheet in turn process. Compared with the on-site process, the new process increases regrinding opera- tion of the mixed magnetic concentrate, decreases the number for cleaning and scavenging by one time. By this method, iron grade and iron recovery are increased by 1.70 and 11.01 percentage points respectivley. The beneficiation indicators were im- proved significantly.