The ball mill is an important grinding equipment in the beneficiation production line. The critical value of the ball mill refers to the impact of the critical value of the barrel mill speed on the production efficiency. Critical speed is one of the main data to measure the working condition of the mill. The effect of grinding media and grinding mining is determined by the speed of the ball mill cylinder. If the rotation speed is slow, then the height at which the steel ball is lifted is small, and the gravity itself causes the steel to be in a sloping state, and the impact force is small, but the grinding action is very strong, although the grinding rate of the grinding and peeling can be improved, the effect is too low. .
The rotation speed is the rotation speed of the cylinder, and the steel ball and the material are in the process of grinding. After the expert's precise calculation, there is a critical value in a small range, which can make the material and the steel ball reach the maximum grinding state and control. In the case of the rotational speed, the production cost is saved by controlling the ball consumption, the production efficiency of the equipment, and the consumption of the equipment.
When the rotation speed is high, the ball mill ball is lifted to a high height. After the ball rises to a certain height, it leaves the cylinder and falls along the parabolic trajectory, and is in a throwing working state. The impact point has a large impact, the ore is mainly crushed by the impact, and the grinding efficiency is the highest.
When the rotation speed of the ball mill exceeds a certain limit, that is, when the rotation speed of the ball mill is high, the steel ball will rotate with the cylinder without falling, and it is in a centrifugal operation state. At this time, the steel ball has no impact and the grinding effect is small, so that the grinding action is stopped. The outermost ball in the ball mill just rotates with the cylinder without falling, and the ball mill speed is called the critical speed.
The critical speed of various ball mills is proportional to its diameter D. The absolute value of the critical speed is not easy to find. At present, only the theoretical critical speed calculation formula is widely used.
In the production process, it is not easy to grasp the critical value of the ball mill speed to reduce the consumption of steel balls and save the cost of ore dressing. Here you will also be provided with the most comprehensive and advanced beneficiation line equipment, as well as the best use solutions to ensure maximum customer productivity.
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