磨介粒径与球磨机磨矿效率关系研究

Study on relationship between grinding medium size and grinding efficiency of ball mill

以φ2.7m球磨机为例,通过DEM方法研究不同磨介粒径对矿物颗粒破碎、能量损失分布等的影响,找出适宜颗粒破碎的工况。研究结果表明:颗粒的破碎分为两种:一种是颗粒抛落,与衬板和磨介碰撞进行破碎;另一种是颗粒在滑移层中滑动,通过磨剥作用进行破碎。通过对颗粒的能损谱图分析可知,在球磨机中磨剥作用占据主要地位。在保持磨介填充率不变的情况下,改变不同直径的磨介,其有效能损以及无效能损均发生改变,分析对比能损以及颗粒破碎的效果,从而选用合适的工作参数。

Taking theφ2.7m ball mill as the example,the influence of grinding medium size on particle breakage and energy loss distribution was studied by DEM method,and the suitable conditions for particle breakage were found out.The study results showed that the particle breakage was divided into two types,one was the particle throwing collision with the liner and the grinding medium,the other was the sliding of the particles in slipping layer leading to the particle brkeage via abrasion and peeling action.After the analysis on the energy loss spectrum of the particles,it was concluded that the abrasion and peeling action played a dominant role in the ball mill.Under the condition of keeping the filling ratio of the grinding medium unchanged,with the variation of the grinding medium size,both the effective energy loss and the invalid energy loss changed.After comparing the energy loss and the particle breaking effects,the appropriate working parameters were identified.