某褐铁矿微波磁化焙烧—弱磁选试验

Experimental Study on the Microwave Magnetic Roasting and Low Intensity Magnetic Separation of Limonite Ores

以河南义马褐煤为还原剂,对印尼某褐铁矿进行微波磁化焙烧—弱磁选试验,主要考察了焙烧时间、焙烧矿磨矿细度及磁场强度对精矿指标的影响。试验结果表明:在还原剂配加量为5.4%、微波功率为1 kW的固定条件下,当焙烧时间为45 min(终点温度840℃)、焙烧矿磨矿细度为-200目占97.17%(-325目占82.03%,-400目占64.15%)、磁场强度为150 kA/m时,可获得铁品位为57.28%、铁回收率为83.95%的铁精矿。试验中发现,微波焙烧产品可以很容易就被磨得很细。

Taking limonite of Henan Yima as reducing agent,the experiments of microwave magnetic roasting low magnetic separation of a certain limonite ore from Indonesia was carried out,by which the influences of microwave heating time,grinding time and magnetic field intensity were studied respectively.The results show that under the fixed conditions of microwave power of 1 kW when the roasting for 45 min（the final temperature at 840 ℃）,grinding fineness of 97.17% ~200 mesh（-325 mesh of 82.03%,-400 mesh of 64.15%） for roasted ores,and the magnetic field strength of 150 kA/m with addition of 5.4% the reducing agent,Fe concentrate with Fe grade of 57.28% and Fe recovery of 83.95% were obtained.It is found during the experiments that the products after microwave heating and roasting can easily be ground very fine.