The ball mill consists of a horizontal cylinder, an entry and exit hollow shaft and a grinding head.

What is the working principle of a ball mill?

The ball mill consists of a horizontal cylinder, an entry and exit hollow shaft and a grinding head. The cylinder is a long cylinder. The cylinder is provided with a grinder. The cylinder is made of a steel sheet, and the steel liner is fixed to the cylinder. Typically, it is a steel ball and is incorporated into a cylinder according to different diameters and a certain proportion, and the grinding body can also be used as a steel profile.

According to the particle diameter of the abrasive material, the material is filled into the cylinder through the hollow shaft of the ball mill feed end. When the ball mill is rotated, the grinding body acts on the cylinder block due to the role of inertia, centrifugal force and friction. It is taken away by the cylinder. When it rises to a certain height, it will be taken off due to its own gravity. The fallen abrasive material is crushed in the cylinder.

The material is uniformly feed into a chamber of the mill through the feed device through the air shaft of the feed. The chamber has a stepper liner or a bellows, and various steel balls are loaded therein. The rotation of the cylinder produces centrifugal force to take the steel ball to a certain extent. The height is lowered, then hits and grinds the material. After the material reaches a coarse mill, it enters two silos through a single layer separator. There is a flat lining with a steel ball in the trash bin to further grind the material. The powder is discharged through the spray trough to complete the grinding operation.

In the process of rotating the cylinder, the grinding body also has a sliding phenomenon, and the material is grinded during the sliding process. In order to effectively utilize the abrasive effect, the mill is used when the material is generally used. It is divided into two parts by the partition to become a dual repository. When the material enters a warehouse, it will be crushed by the steel ball. When the material enters two warehouses, the steel segment will grind it, and the qualified material begins to be hollow from the discharge end. When the shaft is applied, when the material such as sand residue, coarse fly ash and other materials are grinded, and the mill barrel may have no partition, or may be a single-cylinder mill mill, and the grinding body can also use a steel section. .

The feedstock is grinded into a hollow cylinder through a hollow axial neck, and then filled with various diameters in the cylinder (steel ball, steel or gravel, etc.). When the cylinder is rotated about a horizontal axis at a certain speed, the medium and the material contained in the cylinder will be separated from the cylinder by centrifugal force and friction. When the gravity reaches a certain height, the gravity is greater than the centrifugal force. The body wall is thrown down or roll down due to impact, the ore is broken. At the same time, during the rotation of the mill, the sliding between the grinding media will also have a polishing effect on the raw material. The grated material is discharged through the hollow journal.

When the fineness of the grinding product is the same, if the ore size is large, the ball mill has low production capacity; if the ore size is small, the ball mill has high production capacity. This phenomenon is mainly due to small supply of ore, and the ore stay time is short.

The point here is that when the grinding product is required to be more rough, the productivity of the grinder will vary with the size of the ore, and when the grinding product is required to be fine, the abrasive product will not be with ore. Size and significant. .

The ore feed of the mill is the product of the crushing operation. Reduce the grain size of the grinder means that the crushing operation should produce a finer product, which will inevitably increase the total crushing ratio of the crushing operation, and the process is complex and expensive. Increase. In contrast, although the crushing cost is low, the grinding cost is increased, the particle size of the mill is increased. Therefore, when determining the particle size of the rolling mill, the total cost of pulverizing and grinding should be considering. This will achieve the desired production results.

Therefore, usually, when determining the appropriate size of the ball mill feed, it is mainly considered to consider the size of the mining plant, considering factors such as the type of crushing process used in device performance and crushing operations.