现代矿业 ›› 2024, Vol. 40 ›› Issue (03): 156-159.

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内蒙古某低品位铁矿选铁工艺试验

内蒙古某低品位铁矿全铁品位为20.33%、磁性铁品位为13.05%，为开发利用该铁矿石 并确定合理的选铁工艺流程，在矿石性质研究的基础上，进行了原矿高压辊磨预选—预选精矿阶段 磨矿—单一磁选工艺，高压辊磨预选—预选精矿阶段磨矿—磁选淘洗联合工艺，高压辊磨预选—预 选精矿阶段磨矿—磁选浮选联合工艺3种工艺方案的试验研究对比。试验结果表明：3种工艺方案均 可获得铁品位65%以上的铁精矿，前2种方案的选矿指标相当，且远优于方案3，而方案2较方案1可 明显放粗二段磨矿细度，因此确定采用原矿高压辊磨预选—预选精矿阶段磨矿—磁选淘洗联合工艺 作为该矿选铁的最佳工艺，最终获得了铁精矿产率 19.07%、全铁品位 65.50%、铁回收率 61.50%的选 别指标。   

Experimental Study on Iron Separation Process for a Low-grade Iron Ore in Inner Mongolia

The total iron grade of a low-grade iron ore in Inner Mongolia is 20.33%，and the magnetic iron grade is 13.05%.In order to develop and utilize the iron ore and determine a reasonable iron separation process，based on the study of ore properties，three kinds of process schemes were studied and compared， including pre-selection of raw ore by high pressure roller mill-stage grinding of pre-selection concentratesingle magnetic separation process，pre-selection by high pressure roller mill-stage grinding of pre-selec⁃ tion concentrate-magnetic separation and elutriation combined process，pre-selection by high pressure roll⁃ er mill-stage grinding of pre-selection concentrate-magnetic separation and flotation combined process.The test results show that the iron concentrate with iron grade of more than 65% can be obtained by the three pro⁃ cess schemes. The beneficiation indexes of the first two schemes are equivalent and far better than that of Scheme 3，while Scheme 2 can obviously coarsen the second-stage grinding fineness compared with Scheme 1.Therefore，the pre-selection of raw ore by high pressure roller mill-stage grinding of pre-selection concen⁃ trate-magnetic separation and elutriation combined process was determined as the best process for iron sepa⁃ ration of the mine. Finally，the separation indexes of iron concentrate yield of 19.07%，total iron grade of 65.50% and iron recovery of 61.50% were obtained.   

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