某选铁尾矿磁化焙烧-磁选试验研究

采用磁化焙烧-磁选工艺对某选铁尾矿进行了试验研究。通过小型静态焙烧试验确定了焙烧温度、焙烧时间、还原剂用量、磨矿粒度、磁场强度等条件的影响, 并在此基础上进行了回转窑动态焙烧条件试验和连续试验。回转窑动态连续试验结果表明: 在焙烧温度750 ℃、焙烧时间60 min、还原剂用量6%, 磨矿粒度-0.045 mm粒级占88.65%, 弱磁选一粗一精(96 kA/m)的条件下, 获得了产率74.69%、品位59.42%、回收率93.85%的综合铁精矿, 尾矿铁品位下降至10%以下。

Study on Magnetizing Roasting-Magnetic Separation of Tailings from Iron Ore Dressing

The flowsheet of magnetizing roasting-magnetic separation was adopted to treat tailings from iron ore dressing for study. Static roasting tests were carried out to determine roasting parameters including roasting temperature, roasting time, reductant dosage, grinding fineness and magnetic intensity, based on which dynamic roasting tests with rotary kiln led to the following results: after 60 minutes of roasting at a temperature of 750 ℃, with coal dosage of 6% and grinding fineness of -0.045 mm 88.65%, an iron concentrate with iron grade of 59.42%, yield of 74.69% and recovery of 93.85% can be obtained from the roasted ore by adopting a process comprising one roughing and one cleaning of low intensity magnetic separation with magnetic field intensity of 96 kA/m, and the iron grade in tailings can be reduced to below 10%.