Particle Migration Regularity in Compound Force Field of Enhanced Gravity Concentrator

Abstract

ABSTRACTStudies were performed on the particle migration in a compound gravity force field. Significant separation performance differences of narrow size fraction were observed by the distribution rates and ash content difference, response rule of the particle size, and density to the separation environment were analyzed. High weight distribution and high ash content of ultrafine particles in overflow were the main cause of the low selectivity of ultrafine particles, which lead to the contamination of products. Influence of centrifugal force and fluidization water pressure on the sorting process was studied. The essence of the separation was to find the equilibrium point that could achieve the best combination separation behavior of different grain size samples. It was necessary to remove fine particles before separation to improve the overall quality of fine coal separation. The sorting process can be expressed by a simple matrix equation. Thus, the separation performance difference of coal samples can be expressed by sorting function. Influence of centrifugal force, fluidization water pressure, and particle size on distribution rate was analyzed by mathematical model fitting.