Jul 25, 2016 · While the charge motion and the power draw are relatively insensitive to the stiffness and the damping coefficient of the linear spring-slider-damper contact law, the coefficient of friction has a strong influence since it controls the sliding propensity of the charge
The ball mill contains a hollow cylindrical shell that rotates about its axis. This cylinder is filled with balls that are made of stainless steel or rubber to the material contained in it. Ball mills are classified as attritor, horizontal, planetary, high energy, or shaker. View chapter Purchase book
Get Price
Based on differential mechanical energy balances and material grinding p roperties, ball mill charge motion is analysed using geometric approach. We generalised the impact energy balance to obtain
Get Price
In ball mills, steel balls or hard pebbles to break particle based on impact and attrition. A rotating mill charged with media and ore is lifted against the inside perimeter. Some of the media falls and impacts the ore particles at the bottom of the mill. The rest of the media cascades and, in the process, creates particle breakage by attrition
Get Price
First, the motion of the ball charge and its expansion are predicted by a technique called discrete element method. Then the slurry flow through the porous ball charge is tackled with a fluid-flow technique called the marker and cell method
Get Price
The formulation and verification of the discrete element model for the ball charge motion in a ball mill are described in Part I. Here, the model is used to simulate the charge motion in an
Get Price
Jun 12, 2019 · Magnetic liners can improve the performance of ball mills by increasing grinding efficiency, extending service life, and reducing maintenance costs. Despite their importance, the fundamental understanding and the quantitative investigation on the effects of the magnetic liners has not been addressed in the literature. This paper addresses this gap by studying charge motion, and …
Get Price
The energy efficiency of tumbling mills can be examined by directly looking at the motion of rocks and steel balls inside the mill. The make-up of the charge and the lifter bars attached to the inside of the mill shell can be designed particularly to maximize the mass of ore fractured per unit of energy spent on the mill
Get Price
Discrete Element Method simulation of charge motion in ball, SAG and autogenous mills has become a standard for lifter design, power draft evaluation, etc. Both two-dimensional and three-dimensional codes are being used. The two-dimensional code dominates the user market since the code completes a simulation in one or two hours. On the other hand, three-dimensional codes have been in the
Get Price
Discrete element method simulations of a 1:5-scale laboratory ball mill are presented in this paper to study the influence of the contact parameters on the charge motion and the power draw. The position density limit is introduced as an efficient mathematical tool to describe and to compare the macroscopic charge motion in different scenarios, i.a. with different values of the contact parameters
Get Price
For overflow ball mills, the charge should not exceed 45% of the mill volume . For grate discharge mills, the charge should occupy about 50% of the mill volume . Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge, He, and the radius of the mill, R, i.e.,
Get Price
the interaction between liners and mill charge motion and mill power draft (Nordell et ... Figure 2 — Ball trajectory model outputs superimposed on. (simplified) DEM .... mill throughput. Operating with low charge levels can result in serious liner. Read more
Get Price
Ball motion, axial segregation and power consumption in a full the highest value of the S/H ratio; this area had the highest rate scale two chamber cement mill. Minerals Engineering 22, 809–820. Davis, E.W., 1919. Fine crushing in ball mills. AIME Transactions 61, 250–296. of wear
Get Price
prediction of charge motion in ball mills in two dimensions by Mishra and Rajamani ... regions under the shoulder and in the toe region for low to moderate slurry loads .... The upper sections of the cascading stream and the cataracting stream. Read more
Get Price
Jan 14, 2019 · Over 10 years the magnetic metal liner has been used in more than 300 full-scale ball mills at over 100 mine sites in China. For example, one set of the magnetic metal liner was installed in a 3.2m (D) x 4.5 m (L) secondary ball mill (60mm ball charge) at Waitoushan concentrator of Benxi Iron and Steel Corp. in 1992
Get Price