【摘要】 针对酒钢镜铁山粉矿强磁选工艺存在的精矿铁回收率和品位均较低的问题,东北大学在对强磁预富集精矿进行工艺矿物学分析的基础上,进行了悬浮磁化焙烧扩大试验研究。结果表明:酒钢粉矿强磁预富集精矿TFe品位为39.02%,预富集精矿含铁矿物主要为赤铁矿和菱铁矿,铁分布率分别为67.81%、28.36%,脉石矿物主要为石英、白云石和重晶石;粉矿采用强磁选抛尾—悬浮焙烧—磁选—反浮选新工艺,最终获得了TFe品位60.67%、SiO2含量4.52%的合格铁精矿,铁回收率为76.27%。与原单一强磁选工艺相比,新工艺的精矿铁品位提高了16.11个百分点,SiO2含量降低了6.83个百分点,铁回收率提高了14.43个百分点,精矿指标有了较大幅度的提高,为下一步粉矿资源的高效利用提供了技术依据。更多还原

【Abstract】 In order to solve the problem of low recovery and low grade of iron concentrate in Jingtieshan powder ore of Jiusteel,based on the process mineralogy analysis of preconcentrated concentrate with high intensity magnetic separation,Northeastern University carried out an extended test study on suspension magnetization roasting. The results show that the TFe grade of the preconcentrated concentrate with high intensity magnetic separation is 39.02%,the iron content in the sam?ple is mainly hematite and siderite,the iron distribution rate is 67.81% and 28.36%,respectively,and the gangue minerals are mainly quartz,dolomite and barite. With the new process of high intensity magnetic separation tail-throwing-suspension roasting-magnetic separation-reverse flotation,the qualified iron concentrate with TFe grade of 60.67% and SiO2 content of4.52% was finally obtained,and the iron recovery rate was 76.27%. Compared with the original single high intensity magnet?ic separation process,the iron grade of concentrate by the new process was improved by 16.11 percentage points,the SiO2 content was reduced by 6.83 percentage points,and the recovery was increased by 14.43 percentage points. The concentrate index was greatly improved,test results provided technical basis for the efficient utilization of iron powder resources in the next step.更多还原