某低品位铁矿石选矿试验

试验用极贫铁矿石铁品位为13.90%，有害元素磷含量为0.86%，磁性铁占总铁的46.04%，主要以磁赤铁矿、磁铁矿形式存在，磁赤铁矿、磁铁矿以半自形变晶结构为主，嵌布粒度大于0.1 mm的超过75%，约有5%的磁赤铁矿的嵌布粒度小于0.05 mm。为确定该矿石的开发利用工艺，进行了选矿试验研究。结果表明，矿石采用3阶段磨选流程处理，在一段磨矿细度为-0.076 mm占38.5%、弱磁选磁场强度为115 kA/m，二段磨矿细度为-0.076 mm占74%、弱磁选磁场强度为115 kA/m，三段磨矿细度为-0.043 mm占92%、弱磁选磁场强度为115 kA/m的情况下，获得了铁品位为60.12%、铁回收率为40.22%的铁精矿，铁精矿硫、磷含量均较低，满足产品质量要求。

Beneficiation Test of a Low Grade Iron Ore

The iron grade of the extremely poor iron ore used in the test is 13.90%,the harmful element phosphorus content is 0.86%,and the magnetic iron accounts for 46.04% of the total iron,mainly in the form of maghemite and magnetite,maghemite and magnet.The ore is dominated by a semi-self-morphing crystal structure with an inlaid grain size of more than 75% greater than 0.1 mm,and about 5% of the maghemite has a size of less than 0.05 mm.In order to determine the development and utilization process of the ore,a mineral processing experiment was conducted.The results show that the ore is treated by three-stage grinding process: the first stage grinding fineness is -0.076 mm 38.5%,the magnetic field intensity of low intensity magnetic separation is 115 kA/m,the second stage grinding fineness is -0.076 mm 74%,the magnetic field intensity of low intensity magnetic separation is 115 kA/m,the third stage grinding fineness is -0.043 mm 92%,and the magnetic field intensity of low intensity magnetic separation is 115 kA/m.Iron concentrate with 60.12% iron grade and 40.22% iron recovery was obtained.The sulphur and phosphorus content of iron concentrate is low,which meets the requirements of product quality.