【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。更多还原

【Abstract】 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 30 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.更多还原