experimental research on compression crushing process of granular layer . meanwhile, the crushing effect and saving energy of the equipment working in process of grinding ironstone are researched, all these lay a foundation for the further study of the technology. the ration of al to si is 5. 37. the process size of the aggregate of diaspore and clay mineral is relatively coarse, among which the content of more than 0. 1mm reaches 80. 82%. comminution results showed that the aggregate crushing process has large crushing ratio and high output. the plate-roller aggregate crushing process was a suitable equipment to realize more crushing and less grinding during mineral comminution process. the results show that microwave radiation has more influence on fusain than vitrain which caused the diversity and selectivity in maceral crushing process. the vitrinite and inertinite has the highest enrichment ratio with microwave treatment for 2 min, and their content are increased from 57. 7% to 92. 6% and 37. 6% to 57. 7% respectively. in view of the dust recovery from the crushing area's dust collector in barun company, the paper introduces the application process system of pneumatic transport, operation model and the utilization of recycled dust. and then, the corresponding technology problems are discussed. based on the properties of copper-molybdenum ore and the construction scale of mineral processing plant in wunugetu mountain, the design of sabc crushing-grinding process and the selection criteria of main equipments are introduced in this paper. discussions on some problems may be caused in the production process and their solutions are brought up as well. this paper expounds a design of jaw aggregate crushing processs hydraulic overload protection system. this design makes the machine safety, sensitive response, automatic troubleshooting in the overload. it can fast and automatic reset to restore the normal work. through plc control, it can realize the automation of crushing process and overload protection. the design can improve productivity, make the machine safety and reliability working. according to the structural characteristics of crushing cavity and roller teeth of the hammer roller , its productivity calculation is divided into three sections. in addition, considering the dynamic variation of parameters during crushing process, the formula of theoretically calculating its productivity is deduced, and then the formula is used to calculate actual productivity. the calculation result is close to the actual productivity, which verifies the correctness of the calculation formula. according to production practice on copper smelting furnace slag by adopting sag process in guixi slag concentrator, the paper introduces the characteristic of copper smelting furnace slag, analyzes mineral processing, crushing and grinding flow of copper smelting furnace slag by adopting sag process. by comparing to traditional crushing and grinding process, the result is obtained that power consumption of adopting sag process is lower than that of adopting crushing and grinding process. see more images and information about Industrial Milling machines and dynamic stiffness calculation of ball mill ,visit this website:http://crusher.jawcrushermachinery.com/news/dynamic-stiffness-calculation-of-ball-mill.html