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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。
Dong Anshan sinter plant containing siderite flotation beneficiation by 700 ℃ reduction roasting - magnetic separation process, you can get the grade of 60.43%, the recovery rate of 83.59% of the iron concentrate. The transformation mechanism of iron minerals during calcination was studied by means of X-ray diffraction analysis and scanning electron microscopy. The results show that the calcination process will undergo siderite decomposition, hematite reduction and iron mineralization Overreaction in three stages, of which hematite reduction stage corresponding to the calcination temperature is 700 ℃, when the roasted products of magnetite-based magnetite, the most conducive to weak magnetic separation.