SLon高梯度磁选机在国外某进口铁矿石的研究与应用

Research and application of SLon high gradient magnetic separator in an imported iron ore

国外某进口铁矿TFe含量49.11%,工艺矿物学研究发现块状赤铁矿中包裹粒状磁铁矿、褐铁矿交代共生,呈脉状、网状穿插嵌布于脉石矿物中,部分赤铁矿和褐铁矿嵌布粒度过细,难以解离,影响磁选铁精矿中铁的品位和回收率。通过条件试验确定该矿物磁选条件为在弱磁选磁场强度1000 Gs下、强磁粗选和扫选场强分别采用7000 Gs和11000 Gs、强磁选机脉动冲次采用210 r/min。在条件试验基础上进行了连续扩大半工业试验,弱磁选机采用SCT-44永磁磁选机、强磁选机采用SLon-500立环脉动高梯度磁选机,可获得综合精矿铁品位63.24%、铁回收率93.67%的良好指标,为国内进口铁矿采用SLon高梯度磁选机磁选回收利用提供了参考及试验依据。

The TFe content of an imported iron ore from abroad,which TFe content is 49.11%.The study of process mineralogy found that the massive hematite was wrapped with granular magnetite and limonite,which are vein shaped and network interspersed in gangue minerals.The embedded particle size of some hematite and limonite is too fine to dissociate,affecting the grade and recovery of iron in magnetic separation iron concentrate.Through the condition test,it is determined that the magnetic separation condition of the mineral is that the magnetic field strength of weak magnetic separation is 1000 Gs,the field strength of strong magnetic roughing and sweeping are 7000 Gs and 11000 Gs,respectively,and the pulsation impulse of strong magnetic separator is 210 r/min.Based on the condition test,the continuous expanded pilot test is carried out.The weak magnetic separator adopts SCT-44 permanent magnetic separator and the strong magnetic separator adopts SLon-500 vertical ring pulsating high gradient magnetic separator.The comprehensive concentrate iron grade is 63.24%and the iron recovery rate is 93.67%.The test indicators are good,which provides a reference and test basis for the magnetic separation and recycling of domestic imported iron ores through SLon high gradient magnetic separator.