Analyze the movement state of the steel ball when the ball mill is working

When the ball mill is working, the steel balls in the grinding silo are the main grinding parts, so the quality of the steel balls must be good, and the proportion and quantity of the steel balls must be appropriate. Xingkuang Group recommends that the steel ball filling amount is 40%. At this time, the output is high and the grinding effect is good.Do you know what the movement state of the steel ball is when it is working in a ball mill?Below we will introduce and analyze the motion state of the steel ball when the ball mill is working.

The movement state of steel balls inside the ball mill is mainly divided into three forms: falling, throwing, and centrifugal operation.How are these three states of motion distinguished?In fact, the movement state of steel balls inside the ball mill is mainly distinguished according to the speed of the ball mill.

One type: laxative type

When the speed of the ball mill is not high, all the ball loads are deflected upward at an angle, and each steel ball rotates around its own axis.When the inclination angle of the ball load exceeds the natural angle of repose of the steel ball on the surface of the ball load, the steel ball rolls down this slope.This state of movement of the steel ball is called falling.

When the steel ball is in a cascading motion, the material will be crushed by the force of mutual friction generated during the upward and downward rolling of the ball load cylinder wall, and the ore particles will be ground and crushed even more by the friction between the ball loads.In the rolling of the steel ball from top to bottom, it will also have a great impact effect, and the ore particles will be crushed by a huge impact effect.The grinding and crushing effect of the steel ball on the material in the cascading movement is mainly grinding and supplemented by impact.

Two types: throwing type

When the speed of the mill is high enough, the steel ball rotates and rises to a certain height in a circular curve with the inner wall of the cylinder, and then falls in a parabola one after another.The place where the steel ball falls is called the foot area, and the steel ball in it rolls strongly.This kind of movement condition is called throwing.In a throw-down mill, the ore material is ground and stripped by the steel ball in the circular curve movement area.In the foot area, it is hit by the falling steel ball and the grinding and peeling of the strongly tumbling steel ball.

When the steel ball is thrown down, it has greater resistance during the rise of the steel ball. The grinding effect on the material mainly comes from the grinding effect between the steel ball and the liner and the steel ball and the steel ball. Through this effect, the material is ground and crushed.When the steel ball rises to a certain extent, it will be thrown down. In this process, the material is not affected by any force, so it will not be ground or broken.And when the steel ball falls to the foot of the ball, it will violently collide with the liner on the bottom surface and produce a great impact force. This impact force is used to break the material. Therefore, when the steel ball is thrown, the grinding effect is mainly impact crushing, supplemented by grinding.The impact force generated by this method is large, and the crushing efficiency is relatively high.

Three types: centrifugal operation

When the speed of the mill is high enough to exceed a certain critical value, the steel ball is attached to the liner and no longer falls.This state is called centrifugal operation.When centrifugal movement occurs, the ore material is also attached to the liner.

When the steel ball is centrifugal, there is no relative movement between the steel ball and the liner and between the steel ball and the steel ball. There will be no force that can break the material. The material will not be broken or ground during this process. Therefore, the working movement of the ball mill should avoid such movement as much as possible. The occurrence of state.

The above is the analysis of the movement state of steel balls in the ball mill by Xingkuang Group. Experts remind everyone that centrifugal operation of steel balls should be avoided as much as possible when working in the ball mill, because the steel balls will not be ground at this time, and it can almost be said that they are completely useless. In the ball mill, the steel balls are either falling or throwing, or a mixture of the two. Movement.