Auto-SEM particle shape characterization: Investigating fine grinding of UG2 ore

摘要

For processing low grade complex ores there is a need to improve operation efficiency to maintain profitability. This may be done by introducing more efficient equipment or improving the understanding and modelling of minerals processing circuits. Particle shape can have an impact on numerous processes through its effect on drag coefficients, rheology, and particle bubble interactions. Understanding these effects in greater detail could significantly improve model capabilities. Auto-SEM can provide 2D particle shape measurements for thousands of particles, complemented by mineralogical information. These measurements are readily available from previous mineralogical studies and have the potential to be very useful.This study focuses on the dependence of QEMSCAN angularity measurements on image resolution and particle size, and why roundness is a better descriptor for a case study comparing shape characteristics of the major components of UG2 platinum ore when comminuted with different mill types. Alternative methods for characterizing shape are presented and discussed.