Fragmentation - Screening and Grinding - Grading is a major part of the ore dressing process. Reducing the crushing energy consumption of ore and improving the grinding efficiency have always been widely recognized. In recent years, with the increasingly poor, fine and hybrid ore, the sorting process has become more and more demanding on the grain size of the ore. Therefore, people continue to study the crushing process and its impact on the sorting operation on the theoretical and engineering levels to achieve energy saving and consumption, and to provide suitable ore feeding for the subsequent sorting process. When using different materials for the difference of grinding media mineral floatability, Song Zhenguo, Sun Chuanyao studied the ball and zirconia balls and its effect on surface properties of calcite in dodecylamine flotation flotation system behavior. The results of flotation tests show that the wet-grinding with zirconia balls and other calculus results in better flotation results than when using steel balls as grinding media. It is further found through solution detection and mineral surface analysis that the steel balls are in the grinding process. The iron oxide produced in the surface adsorbs on the surface of the calcite, which increases the ξ-potential of the calcite, reduces the surface electronegativity, and weakens the adsorption of the dodecyl cation on the surface, thereby suppressing the flotation of the calcite. Huangguo Zhi et al studied the influence of low-carbon steel and a chromium steel media mill containing two kinds of gamma raft Nigeria and bornite current through spot copper ore floatability. The results show that with the electrochemical activity of the grinding medium and the increase of oxygen content in the pulp, the intensity of the gamma-reduction between the porphyrite and the grinding medium increases; the gamma-nibon effect during the grinding process makes the grinding When the medium is oxidized, the amount of iron oxide components produced in the slurry increases, and the floatability of the porphyrite decreases. Based on the test results, the researchers believe that the application of electrochemically active grinding media is conducive to the flotation recovery of fine-grained (<10μm) porphyrite. In the production practice, Liu Long MQC for wet lattice-type ball mill feed, the discharge end and the wear manganese steel backing plate hole Ball Mill easy to fall off problem, a rubber sheet in place of the original ZGMn13 liner, dual The hole liner represents the liner. Years of practice have proved that these two measures can effectively improve the service life of the mill liner and the operating rate of the ball mill, ensuring normal production. Wang Pengcheng et al. proposed a series grading scheme for cyclone with different diameters for the actual situation of coarse ore grain size in the iron selection workshop of a molybdenum ore dressing plant in Shaanxi. The industrial test results show that the cyclone series grading can adapt to the current situation when the concentration of the coarse concentrate is more than 30%, and can also increase the concentration of the grit, thereby increasing the grinding concentration and grinding efficiency, and improving the final grinding. The fineness of mineral products. This is another industrial application example of the “mother-child cyclone†classification scheme proposed by some scholars in the 1980s. The second stage cyclone is what is commonly referred to as a "controlled classification" cyclone. Zhang Yueying and others used the German compound fluidization classifier to improve the configuration of the C-stage hydraulic grading equipment of a silica sand concentrator. The two-stage classifiers were combined into one equipment, namely the 3-product hydraulic classifier. This not only reduces the floor space and civil construction investment, saves the height difference, reduces the pumping height, and more importantly, can greatly reduce the water consumption and wastewater treatment capacity of the equipment. In order to facilitate maintenance of a ball mill, to reduce energy consumption, or the like in a gold Jianhong processing plant using a ball mill φ3.2 m × 3.1 m sliding bearing to the rolling bearing, a ball mill is significantly reduced energy consumption, energy saving of 15% to 19%; At the same time, the original thin oil lubrication device was also eliminated. The manual pressure pump was used, which was lubricated with flexible sealing lithium grease. 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Crushing--screening and grinding--grading