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Reflux classifier is a liquid-solid fluidized bed equipment widely used in coal separation at home and abroad in recent 20 years. It is mainly composed of fluidized bed and inclined plate area. Reflux classifier has a wide range of application, can effectively separate two kinds of minerals with a certain density difference, and can be used in the separation of fine grained materials. Therefore, it is not only limited to coal separation, but also has certain sorting effect on iron ore or non-ferrous metal ore. Under the advocacy of today′s green mine policy, sorting methods with low pollution and low cost such as gravity separation are more indispensable. In the case of increasingly complex ore properties, traditional gravity separation equipment is becoming more and more difficult to be efficient and convenient processing ore. In this regard, several main types of reflux classifier are expounded, and their separation theory is explained to provide reference for the application of this new type of gravity separation equipment. [ABSTRACT FROM AUTHOR]