The working principle of the polyurethane cyclone is the same as that of the centrifuge. The heterogeneous mixture with a certain density difference can be separated effectively under the action of centrifugal acceleration. The hydrocyclone has the outstanding advantages of large handling capacity, high separation efficiency, continuous separation process, simple and compact structure, convenient operation and easy installation, etc. , it is widely used in petroleum, chemical industry, metallurgy, mining, Food Agriculture, environmental protection and many other fields. With the continuous research, the optimization of the hydrocyclone structure parameters, the simulation of the internal flow field, and the development of application technologies, the hydrocyclone used to separate large particles, such as mineral separation and offshore drilling mud separation, are increasingly being used in more ways, for example, clarification operations such as catalyst recovery, material dehydration and concentration operations and kaolin classification, gold flotation and other particles of classification and separation. With the rapid development of high and new technology, as a conventional low-energy separation equipment, the performance of traditional hydrocyclone separation is improving and its application prospect is expanding.