国外某褐铁矿石磁化焙烧—磨矿—弱磁选试验

摘要

国外某褐铁矿石铁品位为54.12％,褐铁矿多呈疏松、多孔的胶状分布,少部分呈块状或鲕状分布.采用单一浮选和重选工艺不能获得合格铁精矿.为给该矿石开发利用提供依据,进行了磁化焙烧—磨矿—磁选试验,考察了焙烧温度、焙烧时间、烟煤用量、磨矿细度、磁场强度对精矿指标的影响.结果表明:在烟煤用量为15％、焙烧温度为850 ℃、焙烧时间为60 min,焙烧产品自然冷却后经球磨磨细至-0.074 mm占90％,在磁场强度为160 kA/m条件下弱磁选,可获得铁品位为64.65％、回收率为86.05％的精矿.%There is 54.12％ Fe in a foreign limonite ore.Limonite mainly distributed in loose and porous gel,few distributed in block or oolitic form.Qualified iron concentrate will not obtained using neither single flotation nor gravity separation process.To provide technique basis for development of the ore,magnetization roasting-grinding-magnetic separation experiment was conducted,influence of roasting temperature,roasting time,bituminous coal dosage,grinding fineness,magnetic field intensity on index of concentrate were studied.Results indicated that at bituminous coal dosage of 15％,roasting temperature is 850 ℃,roasting time is 60 min,roasted products cooling in natural environment and ground to 90％-0.074 mm by ball mill,via low intensity magnetic separation at field intensity of 160 kA/m,The iron concentrate with iron grade of 64.54％ and recovery of 86.05％ was obtained.