Abstract: In order to realize energy saving and consumption reduction in the crushing and grinding stage and broaden the application boundary of high-pressure roller mill，in view of the problem that the processing capacity decreases with the change of ore properties in the application process of semi-autoge⁃ nous grinding process，the application of high-pressure roller mill in the process of semi-autogenous grind⁃ ing pre-crushing is studied in a mine concentrator.Based on the advantages of high efficiency and energy saving equipment of high pressure roller mill and the unique characteristics of semi-closed circuit crushing process，the process configuration design of high pressure roller mill applied to semi-autogenous grinding pre-crushing is carried out，and the flexible process advantages of high pressure roller mill applied to semi-autogenous grinding pre-crushing process are analyzed.Combined with the relevant application cases of high pressure roller mill，it is concluded that the application of high pressure roller mill in semi-autoge⁃ nous grinding pre-crushing process has good adaptability，which can provide new ideas for the optimiza⁃ tion of crushing and grinding process，capacity improvement，cost reduction and efficiency increase in mine concentrator.

Key words: semi-autogenous grinding system, high pressure roller mill, pre-crushing process, pro? cess transformation