Study On Process And Structural Parameters Of Vertical Spiral Agitating Mill

Compared with the traditional grinding equipment,the vertical spiral stirring mill is considered by the industry to be a very promising powder manufacturing equipment.However,China's research on agitating mills is not very sufficient,lacking certain design experience.And the agitator is the core energy input component of the mill,the influence of some parameters on its life is still unclear.Insufficient research on some parameters that may affect the grinding effect and the wear of the agitator causes the grinding efficiency of the vertical spiral agitating mill to be low during the production process and the life of the agitator to be short,so it is very important to carry out research on the key process and structural parameters of the agitating mill to improve the production efficiency of the agitator mill,reduce energy loss,reduce the wear of the agitator and improve its life.This is of great significance for improving the production technology of mineral resources in China.Previous simulation methods can only simulate solid particles or simulate the medium sphere and slurry as a mixed fluid for simulation.The method has certain limitations.This paper takes CTM-5.5 semi-industrial vertical spiral agitating mill of Chaoyang Dongda Mining and Metallurgy Research Institute as the research object.Study on the grinding effect of the spiral mixing mill,the abrasion of the mixer,the movement state of the media balls and slurry,and the optimization of process and structural parameters is based on DEM-CFD fluid-solid coupling simulation method.The main research contents of this paper are as follows:(1)The principle and installation of the DEM-CFD coupling simulation interface are introduced and explained,and a bend pipe model example is used for simulation verification.Using the Solidworks software to model the CTM-5.5 agitating mill and select the evaluation index of the grinding effect.Finally,the experimental data,EDEM simulation,Fluent simulation and DEM-CFD coupling simulation data are compared and analyzed,which proves the feasibility of fluid-structure coupling simulation.(2)Study on the influence of media ball particle diameter,stirrer rotation speed,medium filling ratio,medium ball ratio,agitator pitch,cylinder liner and slurry concentration on the grinding effect of the agitating mill,and analyze the changes of these parameters.The best parameters for the optimal grinding effect are determined by analyzing the impact of these parameter changes on the grinding effect.(3)Analyze the movement law of the medium ball and the slurry in different positions inside the agitating mill.Furtherly study the influence of the two structural parameters of the agitator pitch and the shape of the cylinder liner on the movement of the medium ball and the slurry.(4)Analyze the influence of the process parameters and structural parameters of the agitator mill media ball diameter,stirrer rotation speed,medium filling rate,agitator pitch,cylinder liner,slurry concentration on the spiral blade wear of the agitator.The three parameters of average kinetic energy of ball,abrasion of agitator blade and average power of agitator are used to comprehensively evaluate the parameters to determine the best parameters.