某铁矿石悬浮磁化焙烧—磁选实验研究

Experimental Study on Suspension Magnetization Roasting-Magnetic Separation of an Iron Ore

某铁矿石铁品位是56.36%,主要以赤褐铁矿的形式存在,脉石矿物主要是石英和铝土矿。对该铁矿石采用了悬浮磁化焙烧—磁选工艺实验研究,在给料粒度为-0.074 mm 56.11%,焙烧温度为560℃,总气量为500 mL/min、CO浓度为30%,还原时间为15 min的条件下进行焙烧实验,然后将焙烧产品磨至-0.074 mm 95%,在磁场强度90 kA/m,选别时间5 min的条件下进行弱磁选实验,获得了铁品位64.42%,铁回收率94.49%的高品位铁精矿,为处理难选铁矿石提供了解决办法。

The iron grade of a certain iron ore was 56.36%.The iron of raw ore mainly existed in the forms of hematite and limonite.The gangue minerals were chiefly quartz and bauxite.Therefore,a suspensionmagnetization roasting-magnetic separation process test was conducted on the ore.The results indicated that the optimum conditions for reducing roasting are as follows:The size of feed is-0.074 mm 56.11%,with roasting temperature 560℃,concentration of CO 30%,and roasting time 15 min.Under the optimum roasting conditions,the roasted products were ground to-0.074 mm 95%,and then magnetic separation was carried out to produce aniron concentrate with iron grade of 64.42%and iron recovery of 94.49%.It also provides a solution for other refractory iron ores.