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

摘要: 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。

Abstract: 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.