镜铁山5～15mm粒级镜铁矿石磁化焙烧—弱磁选试验

甘肃镜铁山矿采用竖炉磁化焙烧—弱磁选—反浮选工艺处理100~15 mm的镜铁矿石,可获得铁品位58.5%左右、铁回收率78%左右的铁精矿;对15~0 mm的粉矿采用磨矿—强磁选工艺处理,仅能获得铁品位为47.5%左右、铁回收率为60%左右的铁精矿。为了提高粉矿分选指标,改善烧结料的品质,对粉矿中的15~5 mm粒级进行了磁化焙烧—弱磁选试验。结果表明,在煤粉与试样的质量比为2%,煤粉粒度为1~0 mm,焙烧温度为810℃,焙烧时间为60 min,焙烧产物磨矿细度为-0.074 mm占80%,弱磁选磁场强度为91.56 kA/m条件下,可获得铁品位为55.80%、铁回收率为83.97%的铁精矿。

Magnetic Roasting and Low Intensity Magnetic Separation Experiment of Specularite Particles at 5~15 mm from Jingtie Mountain

The iron concentrate with iron grade of 58.5%，iron recovery of 78% can be obtained by dealing with specularite particles at 100~15 mm from Jingtie Mountain，Gansu province through the process of furnace magnetic roasting-low intensity magnetic separation-reverse flotation.Iron concentrate with iron grade of only 47.5%，iron recovery of 60% was obtained by dealing with specularite particles at 15~0 mm through the process of grinding-high intensity magnetic separation.In order to improve the beneficiation indexes，the magnetic roasting-magnetic separation experiments on particles at 15~5 mm was conducted.The results showed that iron concentrate with iron grade of 55.80% and iron recovery of 83.97% was obtained at conditions of mass ratio of coal to ore samples at 2%，particle size of coal at 1~0 mm，roasting temperature of 810 ℃，roasting time for 60 min，grinding fineness of roasted products at 80% passing -0.074 mm，and low magnetic field intensity of 91.56 kA/m.