Experimental and Modeling Study of the Regular Polygon Angle-spiral Liner in Ball Mills

Load behavior is one of the most critical factors affecting mills＇ energy consumption and grinding efficiency, and is greatly affected by the liner profiles. Generally, as liner profiles vary, the ball mill performances are extremely different. In order to study the performance of the ball mill with regular polygon angle-spiral liners（RPASLs）, experimental and numerical studies on three types of RPASLs, including regular quadrilateral, pentagonal and hexagonal, are carried out. For the fine product of desired size, two critical parameters are analyzed： the energy input to the mill per unit mass of the fine product, E＊, and the rate of production of the fine product, F＊. Results show that the optimal structure of RPASLs is Quadrilateral ASL with an assembled angle of 50°. Under this condition, the specific energy consumption E＊ has the minimum value of 303 J per fine product and the production rate F＊ has the maximum value of 0.323. The production rate F＊ in the experimental result is consistent with the specific collision energy intensity to total collision energy intensity ratio Es/Et in the simulation. The relations between the production rate F＊ and the specific energy consumption E＊ with collision energy intensity Es and Et are obtained. The simulation result reveals the essential reason for the experimental phenomenon and correlates the mill performance parameter to the collision energy between balls, which could guide the practical application for Quadrilateral ASL.

正多边形角螺旋衬板对球磨机粉磨效率影响的数值分析

球磨机作为一种物料粉碎设备,被广泛应用于冶金、建材、化工和矿山工业等基础性行业。磨介的运动形态对球磨机的粉磨效率影响极大,而衬板是球磨机中改善磨介运动状态并使其获得较佳运动形态的重要零部件之一。因此,针对衬板结构对磨介运动形态的影响,理论分析正多边形角螺旋衬板中磨介运动形态的影响因素,得出磨介运动状态与衬板结构参数的关系方程和曲线图像。通过建模仿真对比分析这些参数的影响效果,验证理论分析的正确性。理论和数值分析结果表明:当正多边形角螺旋衬板的边数为4,并以50°安装转角安装时,球磨机具有较高的粉磨效率,为开展正多边形角螺旋衬板的试验测试研究和合理选择衬板结构参数提供了理论依据。