Abstract: The existing process of Anqian concentrator has problems such as uneven distribution of grinding product thickness, low regrind efficiency, high energy consumption, and poor grinding effect, which affects the subsequent sorting process and leads to poor concentrate indicators.In order to improve the grinding effect of the pre-selected iron concentrate and improve the final concentrate index, it is necessary to use a vertical stirring mill that is more suitable for fine grinding and systematically study the parameters of the stirring mill.In this paper, on the basis of the mineralogical analysis of Anqian pre-concentration iron concentrate, the process experiment of agitated grinding ore-weak magnetic separation is carried out.The test results show that the TFe grade of pre-selected iron concentrate is 39.06%, mainly in the form of magnetite, and the coarse and fine particle size distribution is uneven.By optimizing the experimental research on the process parameters of the ceramic ball agitator mill, the optimal process parameters of the agitator mill are determined:medium filling rate is 68.2%, agitator speed is 1 000 r/min, material-ball ratio is 0.7, medium size is 6 mm, grinding concentration is 50%, grinding time is 2.80 min.After a period of weak magnetic separation, the grinding products can obtain the concentrate index of 67.01% grade and recovery rate of 89.93%.The process is simple, and the indicators are good, which can provide the reference for the process transformation of the concentrator.