摘要
以氢气为还原剂,通过改变还原反应温度、还原反应时间、磁选条件对山西某贫赤铁矿进行还原-弱磁选实验。还原磁化矿采用弱磁磁选工艺,得到高品位铁精矿。采用光学显微镜、XRD、H2-TPR、元素分析(ICP)和化学分析等手段对原矿组成及矿石结构进行分析。结果表明:山西某贫赤铁矿是一种典型的低品位(28.63%)、极细粒、沉积型难选赤铁矿。通过实验得到的最佳工艺条件为:焙烧还原温度440℃,还原时间75min,气体总流速100L/h,H2体积分数50%(N2为平衡气),一段磨矿20min,磁场强度0.229T.采用此工艺可得到精矿铁品位,铁回收率分别达到50.45%,60.92%.氢气还原-弱磁选工艺为山西难选贫赤铁矿的开发利用提供了依据。
Hydrogen was experimentally selected as a reducing agent. The hydrogen reduction and magnetic separation of the low-grade hematite ore were carried out by changing the temperature, time and magnetic separator conditions. Application of reduction-magnetic separation method obtained high quality iron ore concentrates. The mineralogical properties of the raw hematite ore was characterized using optical microscope, X-ray diffractometry, hydrogen-temperature programmed reduction, inductively coupled plasma and chemical analysis. The experimental results show that Shanxi hematite is a typical sedimentary, low-grade （28. 63%）, fine-grained and refractory hematite. And the optimum technological condition were： reduction temperature 440℃, total gas flow rate 100 L/h, V（Hz） ： V（N2）=50% ： 50%, the grinding time 20 rain, magnetic field intensity 0. 229 T. Finally, the concentrated iron grade 50.45%, recovery rate 60. 92% were obtained. Therefore, the utilization of Shanxi refractory hematite through magnetization reducing and hydrogen reduction and magnetic separation would become feasible.
出处
《太原理工大学学报》
CAS
北大核心
2014年第3期306-310,共5页
Journal of Taiyuan University of Technology
基金
国家自然科学基金资助项目(21276172)
关键词
贫赤铁矿
氢气还原
磁选分离
low grade hematite ore
hydrogen reduction
magnetic separation
