宣龙式鲕状赤铁矿石磁化焙烧-弱磁选试验

摘要

宣龙式鲕状赤铁矿石铁品位较高,达48．65%,主要铁矿物为赤铁矿,占总铁的85．84%,其次是碳酸铁,占总铁的9．50%,磁性铁含量较低,仅占总铁的3．12%；脉石矿物主要为石英,磷、铝等有害元素含量均不高。为探索该资源的高效、低耗开发利用方案,采用磁化焙烧—弱磁选工艺进行了选矿试验研究。结果表明,0．2~0 mm的烟煤与-0．074 mm占62%的试样按质量比12%混合,在800℃下焙烧45 min,焙烧产物磨至-0．074 mm占89．2%的情况下进行弱磁选(磁场强度为105．6 kA/m ),可得到铁品位为62．50%、铁回收率为85．50%的铁精矿。因此,磁化焙烧—弱磁选工艺适合处理宣龙式鲕状赤铁矿石。%The iron grade of Xuanlong-type Oolitic hematite ore is up to 48. 65%. Main iron mineral is hematite,account-ing for 85. 84% of the total iron,followed by iron carbonate,representing 9. 50%. The content of magnetic iron is low,only 3. 12%. Gangue minerals are quartz with trace of harmful elements,phosphorus,aluminum,etc. . In order to explore efficient, low-consumption development and utilization of the resources,the process of magnetic roasting-low intensity magnetic separa-tion was selected. The results showed that the mass ratio of sample with 0. 2 ~ 0 mm bituminous coal and-0. 074 mm accoun-ted for 62% as 12%,roasted at 800 ℃ for 45 min,ground the roasted products to 89. 2% -0. 074 mm,and through the process of low intensity magnetic separation (magnetic field intensity 105. 6 kA/m),iron concentrate with iron grade of 62. 50% and recovery of 85. 50% was obtained. Therefore,the process of magnetic roasting-low intensity magnetic separation is the suitable process to deal with Xuanlong-type oolitic hematite.