Abstract
The numerical calculation method is used to analyze the wear of the liner of the general structure of a semi-autogenous mill in the axial direction, and the non-uniform wear of each area of the liner is studied to explore the reasons for said wear. The liner is divided into areas along the axial direction, and the discrete element method (DEM) is used to analyze the relationship between the wear volume of each area and the total mass of particles. The composition ratio of the rocks and steel balls in each area, and its relationship with time, are also studied. The results show that the total mass of the particles in the area has a significant effect on the wear of the liner. When the particles are affected by the conical end cover on both sides during the operation of the mill, they will be stratified along the axial direction. The particles with large masses will accumulate on both sides of the mill, and the particles with small masses will be concentrated in the middle of the mill. As a result, the difference between the density and impact energy of rocks and steel balls in each area is caused, and eventually, the mill liner appears to have non-uniform wear.
Highlights
A semi-autogenous (SAG) mill is a kind of grinding equipment with crushing and grinding functions
To explore the relevant factors affecting the axial wear of the liner, the cylinder model was divided into 10 areas of the same length in the axial direction in the simulation experiment, and the wear amount of each area was monitored and calculated separately
The non-uniform wear along the axial direction of the cylinder liner in the large-scale SAG mill was caused by the stratification of particles during cylinder operation and the difference in the total mass of the particles in each area; The stratification of particles along the axial direction was the inevitable result of the conical structure of the feed end cover and the discharge end cover
Summary
A semi-autogenous (SAG) mill is a kind of grinding equipment with crushing and grinding functions. Since it came into being, it has become a favorite in the mineral industry, with its simple process and operation and efficient workability [1]. The reduced work efficiency caused by the wear and deformation of the liner, and the system shutdown caused by the replacement of the liner, greatly affect production efficiency. The non-uniform wear problem of the liners of SAG mills that this research focuses on is one of the key factors affecting the comprehensive life of the liner. The replacement cycle of the liner is determined by overall wear and deformation, and on the other hand, it is determined by the thinnest part of the worn liner
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