新疆某镜铁矿石磁化焙烧过程研究

发布时间：2019-02-22 20:34

【摘要】：新疆某镜铁矿矿石TFe含量为35.20%,CaO含量为30.64%;铁矿物主要为镜铁矿,脉石矿物主要为方解石和石英。矿石中镜铁矿嵌布粒度微细,属于难选铁矿石。为考察矿石磁化焙烧过程物相转变规律,进行了焙烧温度、焙烧时间和配煤比对其磁化焙烧效果、铁物相转变过程的影响规律试验。结果表明:在配煤比为12%、焙烧温度为800℃、焙烧时间为75 min条件下还原焙烧后,焙烧产品磨细至-0.074 mm占90%,在磁场强度为120 k A/m条件下弱磁选,可获得铁品位为65.95%、回收率77.70%的指标。焙烧温度对镜铁矿磁化焙烧过程影响显著。焙烧温度低于800℃时镜铁矿磁化焙烧转变为Fe_3O_4,焙烧温度为800℃时,焙烧产品Fe_3O_4含量最高;焙烧温度高于800℃时,部分Fe_3O_4又被还原为FeO,产生过还原现象;焙烧温度为900℃时,焙烧产品FeO含量最高;焙烧温度达到1 000℃时部分FeO被还原成金属Fe。此过程与磁选结果的变化规律相符。另外,焙烧温度达到900℃时,部分Fe2O3与CaO反应,生成了2CaO·Fe_2O_3,不能通过弱磁选回收。试验结果为该镜铁矿资源的合理利用提供了技术参考。
[Abstract]:The content of TFe is 35.20%, the content of Cao is 30.64, the iron mineral is mainly vitrinite, the gangue mineral is mainly calcite and quartz. The specular iron ore has fine grain size and belongs to refractory iron ore. The effects of calcination temperature, calcination time and coal blending ratio on the magnetization roasting effect and the iron phase transition process were studied in order to investigate the regularity of phase transition of ore during magnetization roasting. The results show that when the coal blending ratio is 12, the calcination temperature is 800 鈩，

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