大冶铁矿尾矿中铁矿物在线回收工艺与生产实践

On-line Recovery Technology and Practice of Iron Mineral from the Tailings in Daye Iron Mine

简介了大冶铁矿选厂入选原矿性质与大冶铁矿选厂工艺流程,大冶铁矿尾矿中主要矿物含量、铁物相分析及粒度组成,进行了在线尾矿中铁矿物的回收试验研究。在大冶铁矿选矿尾矿中,虽然全铁品位较低且磁性铁占有率也较低,但采用中磁粗选富集-中磁粗精再磨-弱磁精选工艺流程可获得铁品位合格的铁精矿。根据试验研究结果建设了尾矿再磨再选回收系统,生产实践表明,年可回收铁品位62.50%以上的铁精矿0.96万t,年创产值816万元,年利润344万元,且1.72年收回全部投资。既提高了矿产资源的利用率,又创造了可观的经济效益,还带来了明显的社会效益。

The raw properties and technological flowsheet of Daye iron ore concentrator were introduced,also the contents of main minerals,analysis of iron phase and size composition.Meanwhile,the experimental research on on-line recovery of iron from the tailings was carried on.Although the grade of the total iron is very low and the rate of the magnet iron is also low,qualified iron concentrate can be obtained when the technological flowsheet of magnetic roughing enrichment——strong magnetic separation concentrate regrinding——weak magnetic selection was adopted.According to the test results,the regrinding and recleaning recovery system from the tailings was built up.The practice showed that 9600 tons or the iron concentrate with its grade of more than 62.50%could be obtained with annual output value of 8.16 million yuan and annual profit of 3.44 million yuan,which can recover all investment in 1.72y.Not only is the utilization rate of mineral resource improved,but also considerable economic benefits and obvious social benefits are created.