Abstract:In order to deal with the problem that the stope depth will gradually increase and the ore will gradually harden in Luming Literature Mining Industry in the future, and considering the possibility of increasing production in the later stage, the process of semi-autogenous grinding-screening-hard rock crushing system was investigated for the semi-autogenous grinding circuit, and the grindability of semi-autogenous grinding feed and hard rock was measured. The steady-state simulation of the circuit was carried out by using JKSimMet software, and the energy consumption and ore discharge of the semi-autogenous grinding machine were investigated. The 80% passing size of the SAG mill feed is 116.37 mm, which is less than the design value of 150 mm, providing favorable conditions for capacity enhancement of the comminution system. The technical efficiency of the cone crusher for -15 mm particle size is 22.43%, indicating a relatively low crushing efficiency. Results from the SMC single-particle impact breakage test and Bond ball mill work index tests indicate that the ores processed during the study period are more grindable than the samples used in the original design. According to the JKSimMet simulation results, the concentrator can consider increasing the ball charge and maximum steel ball size in the SAG mill, which can effectively address issues of high mill and circuit loads. If the hardness of the ore increases in the future, the pebble port size of the SAG mill could be enlarged, which would reduce the residence time of coarse particles in the SAG mill and increase the pebble return rate. It is recommended that the concentrator consider adding ultra-fine crushing operations, such as high-pressure grinding rolls, after the hydraulic cone crusher, to provide technical and process support for stable and increased production in the comminution system.