Experimental study on mineral processing of iron bearing rocks in Bayan Obo West Mine

In order to achieve the recycling and utilization of iron resources （iron bearing rocks） with a TFe grade of 13%-16% in the Bayan Obo West Mine, this paper takes the iron bearing rocks as the research object, and conducts detailed research on their ore properties using chemical analysis, X-ray diffraction, optical microscopy and other detection methods. Based on this, systematic beneficiation experiments are conducted. The results show that TFe grade in the iron bearing rock is 13.14%, the main recoverable metal mineral is magnetite, and accounts for 52.28% of the total iron. The iron bearing rock needs to be crushed to −3 mm in order to obtain a coarse concentrate with TFe grade of over 20%. Through the stage crushing grading pre-selection process experiment, the tailings removal yield can be 56.01%, the TFe grade of the coarse concentrate is 20.62%, mFe grade is 14.80%, TFe recovery rate is 69.19%, and mFe recovery rate is 94.27%. The principle process of three stage crushing two-stage pre-selection high-pressure roller grinding ultra fine crushing and tail throwing is adopted as the pre-separation technology transformation plan. Under the particle size condition of −0.045 mm 85.80%, a qualified iron concentrate with TFe grade of 65.10%, relative TFe recovery rate of 50.25%, and mFe recovery rate of 93.03% can be obtained by two weak magnetic separations of the coarse concentrate. The research results provide a scientific basis for the efficient recycling and utilization of iron bearing rock.