Study on micro-energy consumption model of ultrafine grinding coal particles

Abstract

Based on the particle size distribution and surface physicochemical characteristics of coal particles, a micro-energy consumption model of coal particles in the ultrafine grinding process was proposed. This model explained the microscopic mechanical behavior of the ultrafine grinding process by defining factors such as agglomeration between particles and the change in particle surface properties as the microscopic constraint energy of particles. Under the multi-domain fractal law of particle size distribution, the truncated particle size was introduced to eliminate the mutual interference between size grades, and the expression of the micro-energy consumption law in the ultrafine grinding process of coal particles was derived by combining with the surface area theory of macroscopic crushing. Through scanning electron microscopy and infrared spectroscopy analysis, it was confirmed that the evolutionary process of coal particle surface morphology and the fracture law of chemical bonds were in line with the viewpoint of the micro-energy consumption model.