Abstract: In order to verify the advantages of high pressure roller mill and vertical stirring mill in the separation process of a complex refractory iron ore,a series of comparative tests were carried out.The results show that,compared with jaw crusher,highpressure roller mill product has higher powder rate and better grindability;compared with ball mill,vertical stirring mill has higher grinding efficiency and better effect;under the same grinding fineness,vertical stirring mill grinding product has higher dissociation degree and higher grade of magnetic separation iron concentrate;high pressure roller mill and vertical stirring mill is used to treat complex refractory iron ore has a significant advantage.

Key words: high pressure roller mill, stirring mill, lean magnetite, grade