The operating principle of a beneficiation ball mill is that a motor drives the drum to rotate, causing the abrasive (such as steel balls, stone balls, etc.) inside the drum to rub and collide with the material under the action of centrifugal force, thereby crushing and mixing the material. Therefore, the fineness of the finished product of a beneficiation ball mill is closely related to multiple factors, including the characteristics of the abrasive, the drum rotation speed, and the properties of the material.

The factors affecting the fineness of the finished product of a beneficiation ball mill are numerous and complex, requiring analysis and optimization from multiple perspectives. By selecting appropriate abrasives, adjusting the drum rotation speed, controlling the material properties, and strengthening operational process management, the fineness of the finished product of a beneficiation ball mill can be effectively improved, thereby improving product quality and production efficiency.

The factors affecting the fineness of the finished product of a beneficiation ball mill mainly include equipment parameters, material properties, and process control:

I. Equipment Structure and Parameters
1. Steel Ball Ratio and Size

The steel ball diameter should be configured according to the target fineness (for example, when grinding lithium ore to a fineness of 100 mesh or above, a size of 60-120mm is recommended). Too many small-sized steel balls will result in insufficient grinding. The number of steel balls should ensure that the ball entrainment capacity is ≥ 35% of the drum volume.
2. Equipment Type and Speed

Design differences between wet and dry, and grate and overflow ball mills affect grinding efficiency. Too low a speed reduces impact force, while too high a speed reduces material retention time.
3. Liner Wear

Severely worn liners reduce the lifting height of the steel balls, weakening grinding kinetic energy.

II. Material Characteristics
1. Physical Properties

The harder the ore, the greater the energy required for grinding. The uniformity of the particle size distribution affects the stability of the final fineness.
2. Moisture Content and Viscosity

Excessive moisture can easily cause adhesion, reducing grinding efficiency. The material concentration should be controlled between 60-80%. Too low a concentration will significantly reduce fineness.

III. Process Operation
1. Feed Rate and Concentration Control

Overfeeding shortens material retention time. Adjusting the water addition or classifier parameters to optimize the slurry concentration is necessary. 2. Classification System Control

The classifier speed, overflow concentration, and return sand volume must be balanced: higher overflow concentrations result in lower fineness, but excessive return sand can easily overload the equipment.

3. Ventilation and Screen Matching

Excessive air volume reduces coarse powder return, while screen mesh size directly limits the maximum particle size of the finished product.

Special Application Example: The target fineness for non-metallic ores such as coal is typically 40-200 mesh, while pulverized coal production requires a fineness of 80μm with a 2% residue.

Mineral processing ball mills are essential equipment in the mining, metallurgy, chemical, and building materials industries. The fineness of their finished product is directly related to product quality and production efficiency. In actual production, multiple factors can affect the fineness of the finished product produced by a mineral processing ball mill. This article will analyze these factors in detail and explore how to optimize the fineness of the finished product produced by a mineral processing ball mill by adjusting them.