摘要
以某低品位复杂难选铁矿石为对象,研究了压球—直接还原—磨选工艺影响因素和机理。结果表明,将破碎至-4 mm的矿石与0.5%的黏结剂1、0%的水和20%的内配煤M3混匀,在压力为190 kN时压制成30mm×20 mm的压球,在1 200℃下还原40 min,焙烧球碎磨至-43μm占85%,经磁场强度均为88 kA/m的1粗1精弱磁选流程处理,最终获得了铁品位为91.44%、回收率为90.85%的直接还原铁产品,可直接作为炼钢的优质原料。
Basedon a low grade complex refractory iron ore, researched the effect indexes and mechanism of pelletizing-direct reduction-grinding and separation technology. Raw ore crashed to less than 4 mm was mixed with 0.5% of organic binder, 10% of water and 20% of reductant coal named M3 for pelletizing under the pressure of 190 kN and then got the pellets of φ30 mm ×20 mm. The pellets were reduced at 1 200 ℃ for 40 min and then the roasting pellet was ground to the size -43 μm 85% , magnetic separation at 88 kA/m under two stage separation. The direct reduction iron with 91.44% iron grade and 90.85% recovery was obtained under this condition. The DRI can be used as superior burden for making steel.
出处
《金属矿山》
CAS
北大核心
2012年第3期70-73,77,共5页
Metal Mine
关键词
难选铁矿石
压球
直接还原
磁选
Refractory iron ore, Pelletizing, Direct reduction, Magnetic separation
