Abstract: Mechanical stirred reactor is widely used in the production of beneficiation reagents. The quality of products is directly related to the uniformity of reagent after mixing. The flow field characteristics in the reactor have an important influence on the mixing efficiency of the equipment and the uniformity of the product. CFD technology is an effective technical means to study the flow field characteristics of reactor. In this paper, the application status of CFD technology in this field and the related research results of flow field characteristics in reactor commonly used in beneficiation reagent industry are summarized. Common technical means of equipment optimization are also introduced.