DEM study of effect of cylinder liner wear on kinematic properties of ore mill media in semi-autogenous mill
In order to study the motion characteristics of the ore grinding medium in the whole life cycle(0-2800 h) of the liner of the semi-autogenous mill,the numerical simulation of the whole life cycle of the liner of the semi-autogenous mill was carried out based on the discrete element method(DEM). Firstly,the two-dimensional contour of the liner was obtained by calculating the residual height of the liner after wear according to the wear rate curve of the liner. Secondly,the cylinder model of semi-autogenous mill in different stages was drawn by Solidworks software. Finally,the discrete element simulation test was carried out in DEM software. The variation trend of mill operation power,energy dissipation distribution,angle of key position of particle motion,inert zone area and particle collision energy spectrum was quantitatively analyzed. The results show that in the whole life cycle of the liner,the particle motion state in the mill will change with the service time of the liner,and the maximum height and throwing distance of the grinding medium and ore will decrease with the increase of the service time of the liner. The cumulative power of effective collision(ore-ore,ore-steel ball) is the main part. The cumulative power of effective collision reaches the maximum of 52140 kW when the liner is 2800 h. The cumulative power of invalid collision(steel ball-steel ball,steel ball-liner) reaches the maximum of 6976 kW when the liner is not worn(0 h). The impact of steel balls and ore on the lining plate is the most serious in the early stage of lining plate use(0-700 h),but with the increase of lining plate use time,the impact of steel balls and ore on the lining plate is alleviated. The liner of semi-autogenous mill will affect the grinding effect,and the parameters of semi-autogenous mill can be adjusted in different wear stages to achieve the best grinding effect.
semi-autogenous milldiscrete elementliner wearmill motion state
万方数据
维普
