Energy-based modelling of single-particle breakage by slow compression.

[Display omitted] • Size-dependent fracture energy distribution and progeny size distribution characterized by uniaxial slow compression tests. • An energy-based model describing single-particle breakage by slow compression is proposed. • Energy absorbed by single particles during compression is modeled as function of particle thickness. • Model able to capture changes in particle fracture energy, stiffness, shape and breakage intensity. • Model validity demonstrated by predicting progeny distribution and energy consumption in double roll crusher. Compression of particles to a fixed final gap is the mode of application of stresses in many crushing devices. Understanding and modelling this particle fracture process is indispensable for comminution operations. The present work is based on detailed compression tests conducted with a polymetallic ore to different applied deformation ratios to characterize the size-dependent fracture energy distribution and progeny size distribution. An energy-based model is then proposed that accounts explicitly for particle thickness and maximum deformation to define if the particle is classified for breakage (classification function), the likelihood that the classified particle is sufficiently nipped to break (breakage probability) and the extent of breakage the particle will undergo (breakage distribution). Expressions that allow calculation of the energy absorbed by the particle in both primary and secondary breakage regimes are proposed. The validity of the model is demonstrated by accurately predicting, without any fitting, the progeny and energy consumption of compression using fixed gaps and breakage in a double roll crusher. The advantage of the approach not only lies in its ability to accurately predict the product size distribution, but also the energy demanded in the operation. [ABSTRACT FROM AUTHOR]