袁家村铁矿选矿厂原生产工艺流程获得的铁精矿TFe品位仅 65%左右、SiO2 含量达 4%～5%,难以满足市场对高品质铁精矿的需求.为此,在详细分析生产流程中混合磁选精矿性质的基础上,采用卧式搅拌磨机细磨—弱磁选+强磁选—反浮选工艺流程开展了提铁降硅试验研究.对TFe品位 42.44%、SiO2 含量 35.42%的混合磁选精矿,在磨矿细度为-0.045 mm占97%情况下,全流程试验获得了产率53.87%、TFe品位67.87%、SiO2 含量1.96%、TFe回收率 86.15%的高品质铁精矿;磨矿细度为-0.045 mm 占 94%情况下,适当增大捕收剂 RA 用量,可获得产率54.76%、TFe品位 67.14%、SiO2 含量 2.09%、TFe回收率 86.63%的高品质铁精矿.研究结果可作为选矿厂提铁降硅工艺流程优化决策依据,对类似性质难选铁矿石的高效开发利用具有参考价值.
Experimental Study on Silicon Reduction and Iron Increasing of a Micro-fine Refractory Magnetite-Hematite Mixed Iron Ore in Yuanjiacun
Iron concentrate with TFe grade of only about 65%and SiO2 content of 4%～5%was obtained using original production process in Yuanjiacun Iron Ore concentrator,which is difficult to meet the market demand for high-quality iron con-centrate.Therefore,based on the detailed analysis of the properties of the mixed magnetic concentrate in the production process,a process of fine grinding,low-intensity and high-intensity magnetic separation and reverse flotation was used to carry out an experimental study on iron extraction and silicon reduction.For a mixed-magnetic concentrate with TFe grade of 42.44%and SiO2 content of 35.42%,high quality iron concentrate with yield of 53.87%,TFe grade of 67.87%,SiO2 content of 1.96%and TFe recovery rate of 86.15%could be obtained under the condition of grinding fineness of-0.045 mm account-ing for 97%.When the fineness of grinding is-0.045 mm accounting for 94%and the amount of RA collector is appropriately increased,high quality iron concentrate with yield of 54.76%,TFe grade of 67.14%,SiO2 content of 2.09%and TFe recovery rate of 86.63%could be obtained.The research results could be used as the process optimization decision basis for iron extrac-tion and silicon reduction in concentrator,and have reference value for the development and utilization of refractory iron ore with similar properties.
horizontal stirring millcombined high-intensity magnetic separatorsilicon reduction and iron increasingre-verse flotationhigh quality iron concentrate
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维普
