东鞍山烧结厂含菱铁矿浮选中矿焙烧机制研究

摘要

东鞍山烧结厂含菱铁矿浮选中矿经700℃还原焙烧-磁选工艺处理,可以得到品位为60.43%,回收率为83.59%的铁精矿.利用X射线衍射分析和扫描电镜分析手段着重对焙烧过程中铁矿物的转化机制进行了研究,结果表明,随着焙烧温度的改变,焙烧过程将经历菱铁矿分解、赤铁矿还原和铁矿物过反应3个阶段,其中赤铁矿还原阶段对应的焙烧温度正是700℃,此时焙烧产品中的铁矿物以磁铁矿为主,最有利于弱磁选.%Through roasting-magnetic separation technology to treat flotation middling containing siderite at 700 ℃,an iron concentrate with Fe grade of 60. 43％ and Fe recovery of 83.59％ was obtained. The study mainly focused on transforming mechanism of iron minerals in reductive roasting process by XRD and scanning electron microscopy. The results showed that with the roasting temperature changed, the roasting process went through three stages like the decomposition of siderite, the reduction of hematite and iron mineral reduction reaction, where the roasting temperature at reduction stage of hematite was just at 700 ℃. At this time, the iron minerals in calcined products are mainly magnetite, which is the most conducive to low intensity magnetic separation.