煤基直接还原-球磨磁选分离钒钛磁铁精矿中铁的研究

Study on recovery of iron from vanadium-titanium magnetite ore with coal-based direct reduction-ball mill magnetic separation process

在添加硼砂的条件下进行了煤基直接还原-球磨磁选分离钒钛磁铁精矿中铁和钒钛的研究。试验中分别考查了还原温度、还原时间、磨矿细度和磁场强度对钒钛磁铁精矿的还原磨选行为的影响。结果表明,在1 050℃下还原100 min,磨矿细度为-0.045 mm占84.88%以及磁场强度800 Gs时,钒钛磁铁精矿通过还原-球磨磁选后获得的铁精粉品位高达90.32%,铁回收率达到95.20%,可用于电炉炼钢;其尾矿为富钒钛料,可用于钒钛回收利用。

The study on recovery of iron from vanadium-titanium magnetite with the coal-based direct reduction and magnetic separation process under the condition of adding borax was carried out. The influences of reduction temperature,reduction time,grinding fineness and magnetic field intensity on reduction,grinding and separation of vanadium-titanium magnetite were investigated respectively in the test. The results show that,when the vanadium-titanium magnetite is reduced at 1 050 ℃ for 100 minutes,with the grinding fineness of- 0. 045 mm accounting for 84. 88% and 800 Gs magnetic field intensity,through the reduction-ball mill magnetic separation process,the grade of iron ore concentrate product is up to 90. 32%,and the iron recovery rate is up to 95. 20%,and the product can be used for electric arc steel making. The tailings are of vanadium-titanium-rich material,which can be used for vanadium-titanium recovery and utilization.