某微细粒嵌布复杂铁矿的选矿工艺流程研究

矿石中铁矿物主要以不规则状产出,粒度以微、细粒为主,嵌布关系复杂,且矿物种类繁多,主要为赤铁矿、假象赤铁矿,其次为磁铁矿、褐铁矿、针铁矿及少量菱铁矿,尚有微量磁赤铁矿、自然铁、磷铁矿等;脉石矿物主要为石英,其它是辉石、绿泥石、云母、长石、黏土矿物等;本研究采用合理多段、适当细磨工艺,强化微、细粒赤铁矿及假象赤铁矿的回收。试验推荐重选—磁选—反浮选联合流程,获得品位为67.79%、回收率为83.23%的铁精矿。

LABORATORY SCALE MINERAL PROCESSING RESARCH ON A COMPLEX IRON ORE WITH Fe-MINERALS FINELY DISTRIBUTED

The structures of the ore are complex, and grains of Fe-minerals are finely distributed in the ore. The species of Fe-bearing minerals are firstly hematite, martite and secondly magnetite,limonite, goethite, with minor amount of siderite and trace amount of magnetic hematite,natural iron, and phosphosiderite. There are pyrite and chalcopyrite as sulphide minerals,and apatite as harmful impurity occuring as independent mineral. The gangue minerals are mainly quartz,secondly are pyroxene, chlorite,mica,feldspar,and clay minerals. Moderate fine grinding,reasonable regrinding and the combination of gravity concentration,magnetic separation and flotation are necessary for improving the recovery of fine and ultra fine particles of hematite and martite. Besides this,reverse flotation should be employed for reaching high grade of concentrate.Test on the ore through gravity concentration,magnetic separation and reverse flotation produced an iron concentrate grading 68.27% Fe with a recovery of 85.50%.