重庆某菱铁矿石磁化焙烧-磁选试验

摘要

In order to confirm the utilization scheme of a highly oxidized siderite ore from Chongqing Province,the exper-imental study of the magnetic roasting-grinding-low intensity magnetic separation process was carried out. Under the conditions of roasting temperature at 800 ℃ for 50 min,the consumption of coal of 10%,the grind fineness of roasted product for 88%passing 200 mesh,low intensity magnetic separation of magnetic field intensity of 119. 43 kA/m,low intensity magnetic concen-trate with iron grade of 58. 94%,and iron recovery of 76. 38% were obtained. After SiO2 ,the high contents of MgO,MnO and Al2 O3 in the weak magnetic separation concentrate are the factors that affect the iron grade of concentrate.%为了确定重庆某高度氧化的菱铁矿资源的开发利用方案，采用磁化焙烧—磨矿—弱磁选工艺进行了选矿试验。结果表明：在磁化焙烧温度为800℃、焙烧时间为50 min、配碳量为10%、磁化焙烧产物的磨矿细度为-200目占88%、弱磁选磁场强度为119．43 kA/m的情况下，可获得铁品位为58．94%、铁回收率为76．38%的弱磁选精矿；弱磁选精矿中Al2 O3、MgO、MnO的含量较高，是仅次于SiO2的影响精矿铁品位的因素，这些杂质有待后续反浮选试验脱除。