Author(s): C. A. Palavecino; M. F. Kurten; M. D. Terroba; S. Pal

Linked Author(s):

Keywords: Mining; Cyclones roping; Computer Fluid Dynamic (CFD) modelling; Discrete Element Method (DEM); Collection box

Abstract: The cyclone oversize collection box is a critical hydraulic structure in mineral extraction processes. Its main purpose is to provide a crucial protection to downstream equipment in the process against damage from oversized particles. The function of this structure is particularly relevant when a roping event occurs, which corresponds to an incorrect cyclone operation where large particles are discharged from the cyclone overflow and something similar to a rope is discharged from the underflow. A classic hydraulic design was used to establish preliminary box dimensions, and later, a Computer Fluid Dynamic Model (CFD) was applied to study the hydraulic behavior for validation purposes. The CFD model was complemented with the implementation of a Discrete Element Method (DEM), to simulate solids behavior inside the box like packed beds and mechanical interaction between the discrete phase particles. The hydraulic design of the box is expected to be able to periodically drain the accumulated packed bed of coarse gravel that collects at the bottom of the box. Due to the possible blockage in the drain discharge, the stage of the process that requires more attention occurs when most of the particles move toward the drop pipe, as soon as the drain is opened. The simulation results showed that there are no operational problems at the discharge, meaning that the box bottom slope towards the drain and drain diameters are adequate. After 15 seconds of physical time simulation after the opening of the bottom dart valve, the required box flushing is fulfilled.

DOI: https://doi.org/10.14264/uql.2020.607

Year: 2020