回转窑磁化焙烧细粒镜铁矿研究  

Study of Fine-graded Specularite by Magnetic Roasting Process with Rotary Kiln

作　　者：丁春江[1] 陈铁军[1] 黄献宝[1] 马浩[1] 苏涛[1] 屈万刚 

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081

出　　处：《钢铁钒钛》2014年第6期118-123,共6页Iron Steel Vanadium Titanium

摘　　要：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0~1 mm、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 e-lectric rotary kiln in order to investigate effects of roasting temperature, roasting time, carbon content andsize fraction, and charge ratio on roasting yield.The results showed that the process condition with roastingtemperature of 830 ℃, roasting time of 60 min, carbon powder（0~1 mm） content of 2.0%, charge ratioof 15%,grinding fineness（-0.074 mm）about 85% and magnetic field intensity of 144 kA/ m obtained oreconcentrate with Fe grade of 55.22% and iron recovery of 87.16%. Microscope detection results indicatedthat most of the nonmagnetic iron ore was converted into magnetite, and some magnetite was dissociativeand helpful for subsequent breaking, grinding and magnetic separation process.

关 键 词：镜铁矿 磁化焙烧 电热回转窑 显微结构 

分 类 号：TF046.2[冶金工程—冶金物理化学]