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Relationship between media filling rate, ball-to-powder ratio and grinding efficiency at different grinding concentrations

2026-03-08

Amidst the complex web of relationships within ball mills, finding a good balance to achieve optimal ball milling is our ultimate goal. Our company, through analyzing the impact of grinding concentration, ball-to-material ratio, and media filling rate on the grinding process, has reached the following conclusions:

1. When the grinding concentration is 90%, the reasonable ball-to-material ratio range is 0.56-0.84, and the media filling rate is 25%-35%. Under these conditions, not only is the grinding efficiency high, but the active power is also large. The main reason is that during wet grinding, the high grinding concentration makes the slurry easily adhere to the media surface. However, as the ball-to-material ratio and media filling rate increase, the relative amount of material inside the ball mill increases, forming a thicker material layer on the inner wall of the ball mill. This reduces the effective center-to-center distance of the media, thereby reducing the active power and grinding efficiency.

2. When the grinding concentration is 80%, the reasonable ball-to-powder ratio range is 0.56~1.12, and the media filling rate is 30%~40%. As the grinding concentration decreases, the suitable ball-to-powder ratio and media filling rate values ​​for grinding efficiency and active power both increase. This is because when the grinding concentration decreases from 90% to 80%, the fluidity of the slurry significantly improves, thus preventing the formation of a material layer on the inner wall of the ball mill, thereby increasing active power and improving grinding efficiency.

3. When the grinding concentration is 70%, the suitable ball-to-powder ratio range for grinding efficiency and active power is 0.56~0.12, and the media filling rate is 35%~40%. This phenomenon continues at a grinding concentration of 80%, but excessively low grinding concentrations will increase the volume of the slurry and shorten the residence time of the material in the ball mill, thus deteriorating grinding efficiency.

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