Evaluation of rate for fine ore grinding by various mills……………………………………………………
Journal Title: Технічна механіка, Техническая механика, Technical Mechanics - Year 2014, Vol 3, Issue 3
Abstract
A kinetic analysis of ore grinding in ball, rod and jet mills is carried out. Studies of grinding in different-type mills demonstrated the possibility of describing this process using calculations of the expectation and a normal deviation of the grainulometric composition of material. It is found that for fine ore grinding the curves of the kinetics equations form square-law parabolas, the factors of which depend on material properties and the mill type. Studies in rates of material grinding have been based on the analysis of variations in the granulometcic composition of a crushed material structure, i.e. grinding kinetics. The grinding rates of limited classes of polymetallic ore, poor copper-nickel ore in tumbling mills, slag and quartz sand in a jet mill are determined. It is shown that the grinding rate for fractions of large particles is decreasing in its effect and is sign-variable in behav-ior for fractions of average and fine particles. It has been suggested that rod, ball and jet mills be used in series at various stages for effective grinding materials in a closed cycle.
Authors and Affiliations
N. Pryadko, G. Strelnikov, Ye. Ternovaya Ye. , V. Grushko
Keywords
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