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What is the ideal particle size of the discharged material from a ball mill?
In the production of stone powder, users typically focus on the output and fineness of the powder. As a key grinding device, the ball mill is widely used in industries such as cement and chemicals, where requirements for powder fineness vary.

So, is finer powder always better when it comes to ball mill production?
The production capacity of a ball mill ranges from 0.65 to 615 tons per hour. During material processing, the feed size should not exceed 25 mm, and the discharge fineness generally ranges between 20 to 200 mesh. Users can choose different types of ball mills according to their production needs, and even adjust the fineness on the same machine to meet varying product requirements.
However, finer is not always better for the discharge fineness of a ball mill. Overgrinding can cause valuable metal minerals to be discharged with water due to excessively fine particles. This not only reduces the grade and recovery rate of the concentrate but also wastes a significant amount of energy and resources, increasing production costs.
On the other hand, if the grinding particles are too coarse, the separation between metal minerals and gangue will be incomplete, which negatively affects subsequent separation processes. Therefore, in powder production, the fineness of a ball mill’s output must be controlled within a reasonable range to achieve a balance between efficiency and quality.
In addition, there is a close relationship between a ball mill's capacity and the fineness of its output. Excessively fine grinding leads to lower energy efficiency in the production process. Hence, properly controlling fineness is crucial for maintaining production efficiency. Of course, many other factors also affect production efficiency. During ball mill operation, users should pay attention to the nature of the feed material and operating methods to maximize output.
In summary, the discharge fineness of a ball mill should strike an appropriate balance, ensuring product quality while avoiding the negative impacts of overgrinding or undergrinding on both production efficiency and final product quality.
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