白云鄂博西矿低品位铁矿石选矿试验  

Beneficiation Experiment on a Low Grade Iron Ore in Western Bayan Obo

作　　者：杨大兵[1,2] 李然[1,2] 曹飞[1,2] 甘杰[1,2] 李乾坤[1,2] 张攀[1,2] 

机构地区：[1]武汉科技大学资源与环境工程学院 [2]冶金矿产资源高效利用与造块湖北省重点实验室

出　　处：《现代矿业》2015年第6期66-68,共3页Modern Mining

摘　　要：白云鄂博西矿铁矿石属于低品位磁铁矿石,矿石中铁矿物主要以磁铁矿为主,并与脉石矿物共生关系密切、嵌布粒度较细。针对此矿物的特性,对该矿进行了破碎—磨矿弱磁选、破碎产品大块预抛尾—阶段磨矿弱磁选试验。结果表明:按第二种流程经过2次大块干式抛尾和1次粗磨湿式抛尾,抛出的尾矿产率为38.05%和43.62%,所得粗精矿在磨矿细度为-0.074 mm占90.2%、磁场强度为135.35 k A/m的条件下进行湿式弱磁选,可得到铁品位为66.27%、回收率为44.68%的铁精矿。2种流程的精矿指标虽然差不多,但第2种流程可以抛掉大量的尾矿,明显减少了磨矿处理量,可见大块预抛尾—阶段磨矿弱磁选流程有明显的优势。Iron mineral mainly exists in form of magnetite in an iron ore from Western Bayan Obo and belong to low grade magnetic iron ore. Magnetite closely associated with the gangue and is finely disseminated. Directly crushing-grinding-low intensity magnetic separation and discarding by preconcentration at block sizes-stage grinding stage low intensity magnetic separation were conducted based on the ore properties. By the latter process, discarding through magnetic separation at block sizes and once discar- ding after primary grinding, tailings yield rate is 38.05% and 43.62% respectively. Rough concentrate ground at 90.2% -0. 074 mm, and via wet low intensity magnetic separation at magnetic field intensity of 135.35 kA/m, iron concentrate with iron grade of 66.72% and recovery of 44.68% is obtained. By comparison the two flowsheet, index of iron concentrate obtained is similar, while the later process can discarding large amounts of railings early and thus reduce the grinding capacity. The discarding by preconcentration at block sizes-stage grinding stage low intensity magnetic separation has significant advantages.

关 键 词：低品位磁铁矿 预抛尾 弱磁选 

分 类 号：TD951[矿业工程—选矿]