The total iron grade of a foreign iron ore flotation tailings is 11.70％,and the SiO2 content is 81.27％.The main iron-bearing mineral is hematite and limonite,with distribution rate of 95.38％,followed by magnetite,with distribution rate of 2.05％.In order to efficiently and comprehensively utilize the flotation tailings of the iron ore,based on the study of ore properties,the beneficiation test is carried out.The com-bined process of high intensity magnetic roughing separation-grinding-high intensity magnetic cleaning sep-aration-1 roughing 2 scavenging reverse flotation is adopted in the test.The qualified iron concentrate with total iron grade of 64.98％ and iron recovery of 85.33％ is finally obtained under the conditions of high inten-sity magnetic roughing separation and cleaning magnetic field strength of 954.93 kA/m,high intensity mag-netic roughing separation concentrate grinding fineness of -0.076 mm90％,dosage of reverse flotation condi-tioning agent NaOH of 1000 g/t,dosage of inhibitor starch of 500 g/t and dosage of collector dodecylamine of 200 g/t.
tailingscomprehensive utilizationhematiteorthogonal test
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