What do I need to pay attention to the adjustment of ball mill load?

Adjustment of Ball Mill load (ball loading and material volume) directly affects grinding efficiency, energy consumption and equipment life. There are several considerations involved in adjusting ball mill loads to ensure safe operation and optimal performance of the equipment. The following are some of the main considerations:

No-load operation

• Make sure that the equipment is installed, and carry out detailed inspection work, including the condition of each screw.
• The empty running time should not be less than the specified number of hours to ensure that the motor rotation direction is correct.

Ball loading quantity and proportioning

• The liquid level of the material should be slightly higher than the ball layer in wet grinding, and overloading should be avoided in dry grinding. Too much will lead to waste of impact force, too little will not be enough grinding.
• According to the material size of the scientific ratio, large ball crushing coarse material, small ball grinding fine powder, regular ball replenishment to maintain the proportion of balance.
• The hardness and density should match the material characteristics, of which high chrome balls are more wear-resistant but costly.

Load and safe operation

• Before adjusting the load, the power must be disconnected and the energy source must be locked to prevent the cylinder from rotating accidentally.
• Regularly check the status of the liner, wear over the limit needs to be replaced, otherwise it will affect the grinding trajectory.
• Gradually increase the load and carry out two experiments.
• Check the vibration and noise condition to make sure it is within the specified range.
• Remove broken balls and impurities regularly to prevent the effective volume from decreasing.

Adjustment of operating parameters

• Determine the amount of ore and water supply, and make a reasonable.
• Dynamically match the feeding speed with the load to avoid sudden increase or decrease leading to “swelling mill” or “empty mill”.
• The ball loading quantity should be adjusted synchronously when the grading system cooperates and the sand return quantity changes in the closed loop.

Example of adjustment process

• Initial evaluation, checking current, sound, and output data.
• Increase or decrease the ball loading quantity by no more than 5% each time, adjust gradually and observe the working condition for 2-4 hours.
• Run continuously for 24 hours without any abnormality before confirming the parameters.

To summarize, the precautions for adjusting the ball mill load include no-load operation, ball loading and proportioning, adjustment of operating parameters, and safe operation and equipment protection and so on.