某细粒含锰褐铁矿焙烧-磁选试验研究

摘要

湖南某含锰铁矿铁矿物嵌布粒度细、锰含量高，本文采用磁化焙烧‐磁选工艺进行铁的可利用性研究，并对磁化焙烧产品进行了X射线衍射分析和显微形貌分析。研究表明，在焙烧温度为850℃、时间60min、煤炭加入量4％条件下得到的磁化焙烧产品，控制磨矿细度－325目85％～90％，在159kA／m的磁选场强下，经过三次精选，可以得到铁品位55．72％、锰品位为7．03％的铁精矿，铁回收率达到80.84％；磁化焙烧产品中主要矿物为磁铁矿，大部分的磁铁矿嵌布粒度细，与锰矿物、脉石以集合体的形式存在，磁铁矿难以实现单体解离。%According to the characteristics that the disseminated extent of iron mineral was fine ,the content of manganese was high ,the magnetizing roast followed by magnetic separation process was adopted to utilizing the iron for a kind of manganese‐containing fine grained limonite ore in Hunan province .Based on XRD analyses and microstructure analysis ,the mineral composition and dissemination relationship of roasting product were discussed .By the optimum conditions that the roasting temperature 850℃ ,the roasting time 60min ,the quantity of coal addition 4% ,the particle size of grinding -44μm 85% ~90% ,the magnetic field intensity 159kA/m ,and by three‐stage cleaning ,the iron concentrate ,with the grade of iron was 55 .72% ,the grade of Mn was 7 .03% and the recovery of Fe was 80 .84% ,was gained .In the roasting product the main minerals were magnetite and manganese oxides .Most of the magnetite was fine grained , exited in the aggregates forms with manganese mineral and gangue .The magnetite was very difficult to be liberated because of the special existing form .