某菱铁矿石直接还原—弱磁选试验

以某菱铁矿石为原料,采用直接还原—弱磁选工艺,研究了焙烧温度、还原时间、碳铁质量比对还原焙烧产品金属化率的影响,以及磨矿细度、磁场强度对弱磁选指标的影响。结果表明:在还原焙烧温度为1 050℃,还原时间为100 min,碳铁质量比为2.3的条件下,得到铁金属化率为90.88%的还原焙烧产品;还原焙烧产品在磨矿细度为-0.037 mm占79.60%,磁场强度为79.62 k A/m下,得到铁品位为92.40%,铁回收率为96.60%的还原铁粉,可直接作为炼钢原料。

Study of Direct Reduction and Low Intensity Magnetic Separation on Siderite

Using a siderite ore as raw material， experimental study on direct reduction and low intensity magnetic separation process was carried out. The effects of roasting temperature， reduction time and carbon-iron mass ratio on the metallization rate of reduction roasted products were studied. And the effects of grinding fineness and magnetic field intensity on the indexes of low intensity magnetic separation were studied. The results show that the reduced product assaying 90.88% metallization rate was obtained under the conditions of reduction roasting temperature at 1 050 ℃ for 100 min and mass ratio of carbon-iron in 2.3. And the magnetic concentrate， assaying 92.40% iron and 96.60% iron recovery， were produced under the conditions of grinding size -0.037 mm account for 79.60%， magnetic field intensity of 79.62 kA/m. The magnetic concentrate can be used as raw material for steelmaking.