袁家村闪石型赤铁矿石深度还原—磁选试验

Deep Reduction- Magnetic Separation of Amphibole Type Hematite from Yuanjiacun

为解决袁家村闪石型极复杂难选铁矿石的开发利用问题,采用深度还原—弱磁选工艺进行了试验研究。结果表明,-2.0 mm的矿石在配煤系数为1.5,煤粉粒度为-2.0 mm,添加剂Ca O与矿石+煤粉的总质量比为5%,还原温度为1 275℃,还原时间为60 min情况下进行深度还原,还原产物磨至-0.074 mm占80%后进行1次弱磁选,磁场强度为127.39 k A/m,最终获得的磁选铁粉铁品位为91.60%、铁回收率为94.35%。因此,深度还原—弱磁选工艺为袁家村闪石型赤铁矿石的高效开发利用提供了技术支撑。

In order to solve the problem in development and utilization of Yuanjiacun amphibole type extremely complex iron ore, tests of deep reduction-low intensity magnetic separation process were conducted. The results showed that iron concen- trate with iron grade of 91.60% and recovery of 94.35% was obtained under the condition of raw ore size -2.0 mm, coal blending coefficient 1.5, pulverized coal size -2.0 mm, mass ratio between additives CaO and ore＋coal 5% , reduction temper- ature at 1 275 ℃ for reduction time 60 min, grinding reduction products to 80% -0. 074 mm, LIMS for one time at magnetic field intensity 127.39 kA/m. The deep reduction-low intensity magnetic separation process provides strong technical support for effective development and utilization of Yuanjiacun amphibole type hematite