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The grinding of the ball mill is mainly caused by the movement of the steel ball. In order to study the operation of the ball mill, it is first necessary to study the movement of steel balls. The steel ball group in the ball mill consists of several layers, and each spherical layer has a breakpoint. A decline point, the coordinates of the lower point of each layer are different, but they all have the same setting condition because they are all inappropriate. Similarly, the coordinates of each falling point are different, but they also conform to the same geometric conditions. By identifying two geometric conditions, we found that the connection between the two turning points, the trajectory and the drop point of the steel ball separation point.
According to the motion law of the steel ball in the ball mill, the geometric shape of the steel ball in the grinding cylinder can be known. Obviously, the cylinder is mainly divided into four different areas.
1. Leakage area: Solid shaded part in the figure, the steel ball is circulated, and the ore is sandwiched between the steel ball.
2, Drop Region: The virtual shaded portion in the figure represents the drop area of \u200b\u200bthe steel ball. In this process, the steel ball will not be grinded before reaching the bottom BB, and the ore is affected by the impact of the steel ball.3, kidney-shaped area: Near the midpoint of the ball mill, the parabolic line and circumference of the steel ball are difficult to clearly clear. In the shadow area, the steel ball is only vibrated, the grinding effect is very weak, and the grinding effect of the ball mill is very poor.
4. Blank area: The new moon section outside the parabola where the steel ball is not moved, and there is no abrasive effect. When the speed is low, the steel ball is not far, the blank area is large. If the speed is too high, the steel ball is thrown away, and the blank area is small, but the steel ball is severely worn on the cylinder or bushing.
It is understood that the conventional ball mill equipment is equipped with a good dust removal device, and its dust removal effect can only reach around 60%. From the perspective of the environment, this dust removal effect cannot be satisfactory.
With the improvement of environmental protection awareness, dust removal effect is increasingly caused by enterprises. Therefore, it is necessary to improve the dust removal effect of the ball mill and provide secondary dust removal for the ball mill equipment.
Which type dust collector will be better? After a large number of research experiments, our company decided to use the cyclone dust collector as the main dust removal device, and use water dust as a secondary dust removal device. After using this measure, the effect is obvious, the dust removal effect of the ball mill is increased from conventional 60% to about 94%. First, the cyclone should be sealed in the lower part of the hopper to ensure that there is no leak. Otherwise, this will have a great impact on dust removal efficiency. Second, the thermostat should be adopted to adopt heatup measures to avoid dust collecting effects of dust collectors.
After the ball mill uses secondary dust removal, it can continue to recover a large amount of dust substances, improve the working environment of the equipment, and reduce dust treatment. However, when the ball mill uses two-stage dust removal, pay attention to some precautions.
First, the cyclone should be sealed in the lower part of the hopper to ensure that there is no leak. Otherwise, this will have a great impact on dust removal efficiency. Second, the thermostat should be adopted to adopt heatup measures to avoid dust collecting effects of dust collectors.
