Study on Grinding Characteristics of Multi-component Complex Ore and Its Component Minerals under Dropping Grinding.

In response to the occurrence of selective grinding phenomena in polymetallic complex ores and the lack of associated research on complex ores and their constituent minerals, an investigation was conducted based on the motion theory of grinding media and the principles of selective grinding. The grinding characteristics were elucidated using metrics such as the breakage rate, grinding speed, and the t₁₀ parameter of the ground product. The relationship between the grinding characteristics of polymetallic complex ores and their component mineral, including pyrrhotite, sphalerite, and quartz, under throw grinding conditions was investigated. The results show that during dropping state, sphalerite enhances the ore comminution effect, indicating that the presence of sphalerite plays a positive role in ore crushing, whereas pyrrhotite and quartz diminish the ore comminution effect, meaning their presence exerts a negative influence on ore crushing. The particle size characteristics of the grinding products of different constituent minerals all affect the particle size characteristics of the ore grinding products, with sphalerite showing a more significant impact on the ore's grinding characteristics. The grinding rate of both the ore and its constituent minerals exponentially decreases with prolonged grinding time, reaching a threshold when the grinding time reaches 4 minutes, where the rate of decrease rapidly slows. These findings can provide theoretical guidance for subsequent research on the optimization and control of grinding polymetallic complex ores under throw grinding. [ABSTRACT FROM AUTHOR]