河北某铁矿石选矿试验研究

Experimental Study on Beneficiation of an Iron Ore from Hebei Province

为合理开发利用河北某矿业铁矿石,在矿石性质研究的基础上进行了选矿工艺试验研究。试验结果表明:原矿经干式磁选预选(50~0 mm)—湿式磁选预选(12~0 mm)—磨矿(-0.076 mm55%)—弱磁选流程选别,可获得铁品位65.67%、硫含量0.51%、铁回收率83.95%、磁性铁回收率96.09%的铁精矿,该铁精矿为半自熔性铁精矿粉;对该铁精矿采用浮选方法脱硫,铁精矿中的硫可降至0.23%;将磨矿细度提高到-0.076 mm75%,用弱磁选方法选别后,可获得铁品位68.50%、硫含量0.43%、铁回收率82.86%的铁精矿,说明提高磨矿细度和增加浮选作业均可降低铁精矿中的硫含量,提高铁精矿品位。

In order to rationally develop and utilize an iron ore in Hebei,the beneficiation process test was carried out on the basis of ore properties.The results show that the iron concentrate with iron grade of 65.67%,sulfur content of 0.51%,iron recovery of 83.95%and magnetic iron recovery of 96.09%can be obtained by dry magnetic separation preconcentration(50~0 mm)-wet magnetic separation preconcentra⁃tion(12~0 mm)-grinding(-0.076 mm55%)-low intensity magnetic separation process.The iron concen⁃trate is semi-self-fluxing iron concentrate powder.The iron concentrate is desulfurized by flotation,and the sulfur in the iron concentrate can be reduced to 0.23%.By increasing the grinding fineness to-0.076 mm75%,the iron concentrate with iron grade of 68.50%,sulfur content of 0.43%and iron recovery of 82.86%can be obtained by low intensity magnetic separation.It shows that increasing the grinding fineness and increasing the flotation operation can reduce the sulfur content in the iron concentrate and improve the iron concentrate grade.