以细粒级镜铁矿为原料,采用电热回转窑进行磁化焙烧试验,研究了焙烧温度、焙烧时间、煤粉用量、煤粉粒度、窑体填充率对焙烧效果的影响.结果表明,在焙烧温度为830℃、焙烧时间为60 min、煤粉用量为2.0％、煤粉粒度为0～1mm、磨矿细度-0.074 mm占85％、窑内填充率为15％、磁选磁场强度为144 kA/m的工艺条件下,得到铁品位为55.22％,回收率为87.16％的铁精矿指标.显微镜检测结果显示,大部分非磁性铁矿物已转化成磁性铁矿物,部分磁铁矿解离发育完全,颗粒变得疏松多孔,利于后续破碎、磨矿和磁选.
Fine-graded specularite was used to carry out magnetic roasting experiment with a laboratory electric rotary kiln in order to investigate effects of roasting temperature,roasting time,carbon content and size fraction,and charge ratio on roasting yield.The results showed that the process condition with roasting temperature of 830 ℃,roasting time of 60 min,carbon powder(0 ～ 1 mm) content of 2.0％,charge ratio of 15％,grinding fineness(-0.074 mm)about 85％ and magnetic field intensity of 144 kA/m obtained ore concentrate with Fe grade of 55.22％ and iron recovery of 87.16％.Microscope detection results indicated that most of the nonmagnetic iron ore was converted into magnetite,and some magnetite was dissociative and helpful for subsequent breaking,grinding and magnetic separation process.
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