安徽某磁铁矿脱泥抛尾选矿工艺研究

Study on Mineral Processing Technology of Desliming and Discarding Tailings of a Magnetite Ore in Anhui Province

安徽某磁铁矿为解决生产流程堵塞难题,针对含泥量大的问题,对中碎前预先筛分筛下矿石进行了脱泥抛尾试验。试验结果表明:①原矿采用干式磁选工艺,可抛弃产率48.37%、全铁品位13.12%、磁性铁品位4.62%的尾矿,磁性铁回收率79.91%;②对原矿中粒75~20 mm、20~0 mm物料分别采用干式磁选工艺,可抛弃产率41.80%、全铁品位11.78%、磁性铁品位0.64%的尾矿,可获得全铁品位18.37%、磁性铁品位8.81%的综合铁精矿;③原矿采用高压辊磨+湿式磁选工艺,可抛弃产率37.75%、全铁品位9.35%、磁性铁品位0.33%的尾矿,精矿品位提高至22.89%,磁性铁回收率达98.89%,湿式预选指标较优。

In order to solve the problem of blockage in the production process of a magnetite mine in Anhui Province,aiming at the problem of large mud content,the desliming and discarding test was carried out on the ore under pre-screening and screening before medium crushing.The results show that:①The tailings with yield of 48.37%,total iron grade of 13.12%and magnetic iron grade of 4.62%can be discarded by dry magnetic separation process,and the recovery rate of magnetic iron is 79.91%.②The tailings with yield of 41.80%,total iron grade of 11.78%and magnetic iron grade of 0.64%can be discarded by dry magnetic separation process for 75~20 mm and 20~0 mm raw ore,and comprehensive iron concentrate with total iron grade of 18.37%and magnetic iron grade of 8.81%can be obtained.③The tailings with yield of 37.75%,total iron grade of 9.35%and magnetic iron grade of 0.33%can be discarded by using high pressure roller mill+wet magnetic separation process.The concentrate grade is increased to 22.89%,the recovery rate of magnetic iron is 98.89%,and the wet preconcentration index is better.