With the development of modern industry, the development of new materials requires the grinding of materials very fine (10 m, less). In order to meet the needs of fine ceramics, electronic materials, magnetic materials, catalysts and other emerging industries. At present, the superfine grinding machines include high-speed impact crusher, Ultrafine Mill  and vibrating mill. In order to achieve the product size, some mills (such as vibrating mill) are designed as closed loop system. After the surface modification of ultrafine particles, the original properties of the particles were changed to meet the process requirements, such as the enamel powder used for electrostatic spraying. With the development and utilization of mineral resources, the grade of raw ore is decreasing gradually. In order to obtain the effective components in raw ore, a large number of ores need to be processed to be used. And the inclusion of refractory ore more ores, useful components in ores with impurity closely together, in order to make the effective components in ore dissociation, only to be fully crushed, after dressing can be useful to separate components with impurities, and remove impurities, concentrate is pure. Due to the development of industry, more and more elements are required for ore recovery, and the requirements for crushing of ore are more specific, and the requirements for crushing machinery are also higher. The specific surface area is the mass per unit mass or volume, and the smaller the particle size is, the larger the specific surface area is. By increasing the specific surface area of the material, the contact area between the material and the surrounding medium is increased, thus the reaction speed is accelerated. For example, the contact reaction of catalyst, combustion and gasification of solid fuel, dissolution of material, adsorption and drying, and large contact area of fluidized bed with powder particles to strengthen mass transfer and heat transfer in chemical industry. In addition, the final product in cement industry - cement clinker and gypsum into powder state, the smaller the size of grinding, the greater the specific surface, the higher the cement mark. In industrial production, due to the specific production process requirements, the solid material has a strict grain size requirements, crushing machine must meet its product size. In the metallurgical industry, the different size of the ore smelting method has different requirements. With grinding, the total surface area of the material increased. Therefore, large granular materials are broken into fine powder, so that several solid materials (mainly chemical components are different) can be mixed, and good uniform effect can be obtained.

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