How to control the ore discharge concentration and fineness of overflow ball mill?

1. Optimize equipment operation

Adjust the water supply: This is the key to controlling the concentration of ore discharge.The operator should pay close attention to the changes in the slurry concentration, and accurately adjust the water supply to keep the ore discharge concentration within a suitable range.

Control the ore feed volume: according to the processing capacity of the ball mill and the sand return situation of the classifier, the ore feed volume should be rationally adjusted.The ore feed volume can be monitored in real time through electronic scales and other equipment installed on the ore feed belt, and automatically or manually adjusted according to the set parameters.Avoid overloading the mill due to excessive ore feed volume, increasing the ore discharge concentration and thickening the fineness; it is also necessary to prevent the ore feed volume from being too small, which affects production efficiency.

2. Regular equipment maintenance

Regularly check the wear of the cylinder, liner, hollow shaft and other components of the ball mill.For severely worn liners, replace them in time to ensure that the trajectory of the steel balls in the mill is normal and the grinding efficiency is improved.At the same time, ensure that the hollow shaft has good sealing and prevent slurry leakage from affecting production.

Check the blades, overflow weir, sand return pipe and other components of the classifier.Replace the worn blades in time, clean up the debris on the overflow weir, ensure that the height of the overflow weir meets the requirements, and stabilize the grading effect of the classifier.For the sand return pipe, it is necessary to regularly check for blockage to ensure that the sand return can be smoothly returned to the ball mill for re-grinding.

3. Adjust the strategy according to the ore characteristics

For ores with higher hardness, the number of grinding media or the hardness of steel balls can be appropriately increased to enhance the grinding effect.At the same time, adjust the speed and ore feed volume of the mill so that the ore can be fully ground in the mill.

For ores of different particle sizes, different ore feeding methods and grading strategies are used.If there are more coarse particles in the ore, coarse and medium crushing treatment can be carried out first, and then into the ball mill. At the same time, the amount of sand returned by the classifier can be appropriately increased, and the number of cycles of ore grinding can be increased; if there are more fine particles in the ore, the ore feed volume can be appropriately reduced to avoid the occurrence of over-grinding.

In short, reasonable control of the ore discharge concentration and fineness of the overflow ball mill will not only have a positive impact on the grinding effect, but also on the subsequent operation process and even the grade of the concentrate will have varying degrees of impact. These two parameters should be reasonably controlled according to the characteristics of the ore.