# Running Speed is Critical for Ball Grinding Mill

The critical speed of various ball mills is in direct proportion with its diameter, the absolute figure of critical speed is hard to calculated, and now only the calculation formula on critical speed in theory is widely used. When the non-smooth lining plate is used, the filing ratio of ball load is among 40 percent~50 percent. When the ore-grinding concentration is larger, the grinding effect is close to the practical production.

As a professional ball mill manufacturer, Hongxing Machinery analyzes the factors affecting the production efficiency, hoping to produce help and support to customers.

In respect of rotating speed control, the high-efficiency production is very limited. Meanwhile, only if you control the rotating speed well can you control the consumption of steel ball.

When the rotating speed of ball mill is high, the height the ball raised is high. The ball will get away from the barrel when the ball rises to certain height, and falls along the parabolic path. There is comparatively large impact force on drop point. When the ore is crushed by the impact force, the grinding effect is highest.

On the other hand in high speed, the ball will be lifted highly. After the ball is lifted to a certain height, it will separate from the barrel and falls along a parabolic trajectory in throwing working state. The ball will gain a great impact at the drop point. The ore is mainly ground by the impact, and the grinding efficiency is high.

When the rotating speed of ball mill exceeds a certain speed (with much higher speed), the steel ball will rotate with the barrel and won't fall down, in a condition of centrifugal movement. There is no impact force, so the grinding function is much less, and the ball mill stop grinding. The ball mill rotating speed is called critical speed when the outmost layer balls just rotate with the barrel and don't fall.

So in the production of used ball mill, to control the critical rotating speed reasonably can realize the effective control on the steel ball consumption. Meanwhile the lower on ball consumption will decrease the ore grinding production cost. Comprehensively considering, control the ball mill rotating speed perfectly will greatly improve the ball mill production efficiency and decrease the energy consumption of ball mill specific yield.Henan Hongxing Mining Machinery Co., Ltd is the professional manufacturer of complete sets of mining machinery, for example, mobile crusher Welcome all of you to visit our official website.