贵州某难选褐铁矿选矿试验研究

Study on the Beneficiation Technology of a Refractory Limonite Ore of Guizhou

贵州某铁矿主要铁矿物为褐铁矿和赤铁矿,脉石矿物主要为粘土、绿泥石等铝硅酸盐,铁矿物嵌布粒度细,共生关系复杂,磨矿易泥化,属极难选铁矿。采用重选、强磁选、强磁-反浮选工艺进行选矿试验,所得铁精矿品位和回收率都很低;在磁化焙烧-弱磁选正交条件优化试验基础上,采用磁化焙烧-磨矿分级-细粒弱磁-粗粒再磨弱磁选工艺,最终可获得铁品位61.22%、回收率77.82%的铁精矿。该试验研究为贵州某褐铁矿的开发利用奠定了基础,同时对于其它类似铁矿开发利用具有一定的借鉴和参考价值。

An iron ore of Guizhou contains iron minerals which are mainly limonite and pyrite and gangue minerals that are mainly aluminosilicates such as clay and chlorite. The ore is characterized by fine dissemination size of iron minerals, complex intergrowth and being easy to slime in grinding, belonging to refractory iron ores. Beneficiation tests were made on the processes of gravity separation, high intensity magnetic separation （ HIMS）, and HIMS -reverse flotation, which all achieved a very low grade and recovery of iron concentrate. Based on the orthogonal conditional optimization tests of magnetized roasting-LIMS, a process consisting magnetized roasting, grinding-classification, LIMS of fine particles and regrinding- LIMS of coarse particles was adopted, producing an iron concentrate assaying Fe 61.22% at a Fe recovery of 77.82%. This study has laid a foundation for the exploitation and utilization of this iron ore of Guizhou and can also be used as reference to the exploitation and utilization of other similar iron deposits.