酒钢镜铁山竖炉焙烧矿选矿工艺优化研究

Study on Optimization of Beneficiation Process of Roasting Ore in Shaft Furnace of JISCO Jingtieshan

为解决酒钢镜铁山镜铁矿竖炉焙烧熟料采用磁滑轮预选-欠烧矿二次焙烧后抛废-磨矿-弱磁选工艺处理所存在的磨矿效率、精矿铁品位和铁回收率均较低等问题,进行了选矿试验研究。结果表明,原料破碎至0~5 mm后经粉矿干选,干选精矿磨矿-弱磁选,干选中矿二次焙烧-磨矿-弱磁选,最终可获得铁品位为58.31%,回收率为84.39%的铁精矿,粉矿干式抛尾产率为7.56%、铁品位为7.75%,需进行二次焙烧的中矿产率为18.03%。与现场生产指标相比,新工艺精矿铁品位高3个百分点左右,铁回收率高2个百分点左右。因此,新工艺是处理现场焙烧矿的合适工艺,具有节能减排、降本提质的效果。

Magnetic pulley preconcentration,the second roasting of underburned ore and discarding,grinding,low intensity magnetic separation were used to treat the roasting ore of JISCO Jingtieshan specularite.In order to solve the problems of low grinding efficiency,low concentrate iron grade and low iron recovery of specularite in shaft furnace,the beneficiation tests were carried out.The results showed that the final iron concentrate with iron grade of 58.31%and recovery rate of 84.39%can be obtained after being crushed to 0~5 mm,dry preconcentration with powder ore,grinding-low intensity magnetic separation of dry concentrate and the second roasting-grinding-low intensity magnetic separation of dry middling.The yield of dry tailing is 7.56%and the iron grade is 7.75%,and the yield of middling requiring the second roasting is 18.03%.Compared with the actual site index,the iron grade of concentrate is about 3%higher and the iron recovery rate is about 2%higher with the new process.Therefore,the new process is an appropriate process for roasted ore on site,which realizes the effect of energy conservation and emission reduction,cost reduction and quality improvement.