Ball matching method of single-warehouse ball mill

A single-silo ball mill is a common grinding equipment with only one working silo for crushing and mixing materials.The grinding effect of a single-warehouse ball mill is affected by many factors, among which the steel ball matching method has a greater influence.So what principles should this ball matching method follow, and what factors should be considered?This article will provide detailed answers.

Overview of single warehouse ball mill

(1) Equipment structure

The structure of a single-compartment ball mill is composed of a cylinder, a grinding ball, a inlet, a discharge port, a bearing and a drive device.The cylinder body is its main component, and it is equipped with a grinding ball inside, and the grinding work is also completed in the cylinder body.Grinding balls refer to spheres of different sizes and materials. During the grinding process, these spheres grind, peel and smash the materials to complete the material crushing.The inlet and outlet ports are respectively the parts of the material in and out, the role of the bearing is to support the rotation of the cylinder, and the drive device is equivalent to the CPU of a single-compartment ball mill, which is used to drive the rotation of the cylinder, usually composed of a motor and a reducer.

(2) Workflow

The workflow of a single-warehouse ball mill is to determine the size and material of the steel ball according to the nature of the material, and add it to the cylinder body. When the cylinder body begins to rotate, the material enters the cylinder body through the inlet, and the steel ball rotates with the same body, causing impact and friction on the material, causing the material to gradually change from large to small until it is ground into powder, and then discharged from the ore discharge port.

The principle of ball matching for single-warehouse ball mill

The ball matching of a single-warehouse ball mill should follow multiple principles, such as the speed, the material of the grinding ball, the loading capacity, the ratio of the large and small balls, and the filling rate of the grinding ball.The price of grinding balls of different materials also varies greatly, and the cost of grinding balls must also be considered.

(1) Choose the size of the grinding ball according to the speed

The speed of the ball mill has a great influence on the choice of grinding ball. If the speed is fast, but the diameter of the steel ball is small and the quality is lighter, it may cause the steel ball to fly out of the cylinder.

(2) Grinding ball material

The material of the grinding ball will also affect the grinding effect.Steel balls are suitable for materials with higher hardness, while ceramic balls or alumina balls are suitable for materials sensitive to iron pollution.

(3) Grinding ball loading capacity

The loading capacity of the grinding ball will also affect the grinding effect, and the loading capacity of the grinding ball should account for 30% to 50% of the effective volume of the cylinder.

(4) The ratio of large and small balls

In actual operation, a combination of grinding balls of different diameters is usually used to achieve more efficient grinding.The larger grinding ball is responsible for crushing, while the smaller grinding ball is responsible for refinement.

(5) Filling rate

The filling rate refers to the percentage of the volume of the grinding ball in the grinder.If the filling rate is too high or too low, it will affect the grinding efficiency.

(6) Cost considerations

When choosing a grinding ball, cost-effectiveness also needs to be considered.The materials of steel balls are different, and the prices vary greatly, but they may be more efficient in some cases, so it is necessary to choose based on cost and efficiency.

Factors affecting the ball matching of a single-warehouse ball mill

In the process of matching balls to a single-warehouse ball mill, the requirements of material hardness, grinding fineness, and grinding time must also be taken into account.

(1) Material hardness

Materials with higher hardness require the use of larger diameter grinding balls, because larger diameter steel balls have a greater impact force to break them.Materials with lower hardness can use smaller diameter grinding balls.

(2) Grinding fineness requirements

When the initial material particle size is large, a larger diameter grinding ball should be used to quickly reduce the particle size.As the particle size of the material decreases, the diameter of the grinding ball can be gradually reduced.

If you need finer grinding mineral products, you may need to use smaller diameter grinding balls because they can exert a more detailed grinding effect on the material.

(3) Grinding time

If the grinding time is limited, it may be necessary to use a larger diameter grinding ball to speed up the grinding process.Conversely, if there is enough time, a smaller diameter grinding ball can be used to achieve a finer grinding effect.

Above, we introduced the single-warehouse ball mill, the principle of ball matching and the influencing factors of ball matching. By fully mastering these points, we can master the ball matching method. Reasonable steel ball ratio and filling rate are important prerequisites to ensure the grinding effect of a single-warehouse ball mill.