某磁铁精矿提铁降硅选矿试验

Beneficiation Experiment on Iron Improvement and Silicon Reduction of a Magnetite Concentrate

某磁铁矿选矿厂采用阶段磨矿—弱磁选流程生产的磁铁精矿全铁品位为65.47%,SiO_2含量为6.52%。为了使铁精矿的SiO_2含量降到4%以下,以磁铁精矿为研究对象进行了提铁降硅选矿试验。试验结果表明:先采用氢氧化钠、玉米淀粉和阳离子捕收剂Ge-609对试样进行1粗1精3扫反浮选,再将反浮选尾矿再磨至-0.038 5 mm 90%后进行1粗1精弱磁选,最终可获得铁品位为69.18%、铁回收率为97.67%、SiO_2含量为3.15%的铁精矿,实现了提铁降硅。

Iron grade of a magnetite concentrate containing SiO2 6. 52% is 65. 47%,which was producted by a magnetite concentration plant using stage grinding-low intensity magnetic separation flowsheet. In order to reduce SiO_2 content of the iron concentrate less than 4%,take the magnetite concentrate as research target,beneficiation experiment on iron improvement and silicon reduction was conducted. The results showed that iron concentrate with iron grade of 69. 18%,iron recovery rate of 97. 67%,SiO2 content of 3. 15% was obtained via one roughing-one cleaning-three scavenging bulk flotation using sodium hydroxide,corn starch,cationic collector Ge-609 and reverse flotation tailings regrinding to fineness-0. 038 5 mm 90%-one roughing-one cleaning low intensity magnetic separation,iron improvement and silicon reduction was realized finally.