Relationships between particle breakage characteristics and comminution response of fine iron ore concentrates

A Hybrid PBM-DEM Model of High-Pressure Grinding Rolls Applied to Iron Ore Pellet Feed Pressing

“…13, demonstrates that the pressure profile in the industrial-scale machine is more constant in the central portion of the rolls. Indeed, the DEM simulation was able to capture this effect that was already reported experimentally by some authors (Campos et al, 2021b;Morley, 2010).…”

“…*Only used in simulations of industrial-scale machines plant in question (Campos et al, 2021a). A previous study demonstrated relatively minor differences in pressing response between the samples (Campos et al, 2021b), making comparisons valid between them. Operating conditions and main feed characteristics are presented in Table 2.…”

Review and Further Validation of a Practical Single-Particle Breakage Model

“…A more direct and less time-consuming approach is to measure directly the energy required to break individual particles, using either slow compression devices (Sikong et al, 1990;Tavares, 2007;Rozenblat et al, 2011;Ribas et al, 2014;Campos et al, 2021) or instrumented drop weight test devices, such as the impact load cell (King and Bourgeois, 1993;Tavares and King, 1998;Bonfils, 2017;Lois-Morales et al, 2020), analyzing the distribution of data. While requiring more specialized equipment, this approach has the advantage of demanding significantly smaller sample volumes.…”

“…Some researchers have demonstrated the potential of measuring the strength and fracture energies of fine particles in special devices (Steier and Schönert, 1972;Yashima et al, 1979;Sikong et al, 1990;Antonyuk et al, 2005;Nguyen et al, 2009;Yan et al, 2009). Ribas et al (2014) showed the potential of using a commercially-available micro compression tester to measure the fracture energy distributions of single particles in the 45-37 μm size range, whereas Campos et al (2021) recently applied it to test iron ore particles contained in the range of 45 to 150 μm, with good results. Nevertheless, due to the challenge in measuring breakage characteristics of single particles down to such fine sizes, some indirect estimation approaches have been proposed.…”

“…One device that could be useful in this task is the rigidly-mounted roller mill, which crushes particles nearly individually between rigidly-mounted rollers with carefully controlled gaps (Böttcher et al, 2021). In spite of challenges in measuring the energy required to break particles contained in the finest sizes studied (45 μm), it provided good estimates of the size distribution of particles under stressing conditions that approach the minimum required for fracture (Campos et al, 2021).…”