Modern Mining ›› 2024, Vol. 40 ›› Issue (03): 156-159.
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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.
