基于单次料层冲击破碎质量模型的球磨选择函数

Selection Function Based on Single-impact Breakage Mass Model of Particle Beds in Ball Mills

为提高球磨破碎效率,以及构建球磨装置的颗粒破碎过程模型,开展了基于单次料层冲击破碎质量模型的球磨选择函数研究。根据料层夹持形态与落球冲击试验,将料层破碎分为低冲击能下的未完全破碎和高冲击能量下的完全破碎两种状态。分析了单位质量能耗特性和细颗粒对夹持破碎质量的影响,分别建立了两种破碎状态下的料层冲击破碎质量模型。结合冲击能量谱,构建了基于单次料层冲击破碎质量模型的球磨选择函数,将介质球径、颗粒特性等影响球磨破碎效率的参数纳入到选择函数中。

In order to establish the particle comminution process model and improve the grinding efficiencies in ball mills, the studies of the selection function were carried out based on the singleimpact breakage mass model. According to the nipped configurations and the falling ball impact tests, the particle-bed breakage was divided into the incomplete breakage in low impact energy and the complete breakage in high impact energy. The energy of mass specific fracture energy and the effects of fine particles on nipped breakage mass were analyzed. The models of the single-impact breakage mass under two broken states were built respectively. The selection function, which included the breakage influence factors such as media diameter, particle size and particle shape of ball mill, was set up based on the impact energy spectrum and the single-impact breakage mass model.