Определение энергоэффективности режимов измельчения твердых материалов в шаровой мельнице

Abstract

В статье представлены результаты аналитических исследований процесса измельчения сыпучих материалов в шаровой мельнице. Предложен метод определения эффективности использования рационального режима измельчения, определенного с помощью дифференциального уравнения, решение которого соответствует значению коэффициента режима измельчения, обеспечивающему максимальный коэффициент полезного действия процесса измельчения.

Theoretical, analytical and experimental studies of the solid materials grinding process in the ball mill have shown that it is possible to improve the energy efficiency of the grinding process by implementing the direct blow effect, ensuring rational grinding mode and correlation of destructive loads during dispersion of specific material with the prescribed physical and mechanical properties. A phenomenological model of energy efficiency of grinding solid materials in the ball mill was developed, and the theory of calculating the grinding mode coefficient, which corresponds to the maximum efficiency factor of the process of grinding the specific material, was scientifically substantiated. The method for comparative evaluation of the effectiveness of implementing the calculated mode with the traditionally recommended was developed. Using the proposed scientifically grounded method of determining the rational coefficient of the grinding mode allowed reducing the grinding time of cement clinker by 28,9 %, coal — by 18,4 %, marble — by 28,9 % and rock salt — by 19,6 %. Herewith, the decrease in energy consumption for the grinding process was 18,3 % for cement clinker, 9,4 % for coal, 18,4 % for marble and 10,4 % for rock salt.