(261c) Breakage of Structured Particles: A Comparison between Stress-Strain and Impact Events
AIChE Annual Meeting
2020
2020 Virtual AIChE Annual Meeting
Particle Technology Forum
Particle Breakage and Comminution Processes
Thursday, November 19, 2020 - 8:30am to 8:45am
The goal of this paper is to look at particle scale strength as a function of particle size distribution and then examine the differences in breakage of structured particles during stress-strain events versus impact events. A population balance model is used to determine the breakage selectivity coefficients. These coefficients are then correlated with the mode of breakage (impact versus stress-strain) using FEM models of stress induced by each type of breakage. However, the breakage rate constants are correlated to the strength as a function of the particle size distribution of the primary particles. Combining the breakage pattern computed by FEM analysis of particles with particle scale strength models and the population balance model provides a rich toolset to understand and predict breakage. A set of structured particles (balls, rods, crosses, and grid-shaped) were created from a consistent set of cohesive particles. These particles were then subjected to stress-strain events and impact events. The breakage studied by the population balance model and FEM analysis of structured particles were used to determine the breakage selectivity behavior. A polydisperse particle scale strength law was used to determine strength as a function of the primary particle size which was correlated to the breakage rate constants.