Effect of properties of solids on grinding energy in mills

The urgency of the issue under discussion is explained by the necessity of enhancement of mining efficiency by means of reducing energy consumption of crushing and fine grinding in mills. This study aims at experimental validation of the theory of crushing and fine grinding of solids in grinding chambers of mills. The milling processes are described using physicochemical phenomena: phase transitions, thermolysis, emission, point defects, dislocations and other factors of the theory of short-lived activity centers. A promising way of solving this problem, including reduction in energy consumption of crushing and fine grinding of solids in different-kind mills in the framework of product preparation, is justified. The main deficiencies of fine grinding of solids in mills are identified. The lab-scale test bench on the ball-tube mill basis is described. The test bench allowed identification of unit impulses, recording of their shapes and their spectral analysis. The experimental validation of the theory of milling with measurement of the ball load parameters in the contact zone of balls and grains is presented with regard to rocks. The ideas on influence of friction properties of mineral grains on the energy of milling in grinding chambers are amended. It is found that the energy criterion of failure depends primarily on the physical properties of materials subjected to milling. The measurement of dynamic parameters in the ball–grain contact zone without receiver-induced impairment of the results proves that optimization of the milling process with regard to the phenomena of damping of the impact amplitude is an efficient tool of reduction of energy consumption in crushing and fine grinding in mills. The theoretical concept of processing in grinding chambers in mills is proved experimentally, by measurements of the ball load parameters immediately in the contact zones of balls and mineral grains.

Golik V. I. Effect of properties of solids on grinding energy in mills. MIAB. Mining Inf. Anal. Bull. 2021;(10):112-122. [In Russ]. DOI: 10.25018/0236_1493_2021_10_0_112.

V.I. Golik, Dr. Sci. (Eng.), Professor, e-mail: v.i.golik@mail.ru, Mining North-Caucasian State Technological University, 362021, Vladikavkaz, Russia.

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