Ball mill is the key equipment for crushing materials after crushing. The ball mill is composed of a horizontal cylinder, a hollow shaft for feeding and discharging materials, and a grinding head. The cylinder is a long cylinder with a grinding body inside the cylinder. The cylinder is made of steel plate, with a steel liner fixed to the cylinder, and the grinding body Generally, it is a steel ball, which is packed into the cylinder according to different diameters and a certain proportion. The grinding body can also be a steel section.
Advantages of ball mill:
As a typical media movement type crushing equipment, ball mills are widely used in cement, silicate products, new building materials, refractory materials, fertilizers, black and non-ferrous metal beneficiation, glass ceramics and other production industries. Grinding materials are subjected to dry or wet grinding.
1. Environmental protection, good sealing, realize negative pressure operation, and effectively prevent dust from flying;
2. Large production capacity, able to meet the requirements of modern large-scale industrial production;
3. The material has strong adaptability and large crushing ratio, which can reach more than 300;
4. Both dry and wet operations can be used;
Choose according to the particle size of the grinding material. The material is loaded into the cylinder by the hollow shaft at the feed end of the ball mill. When the cylinder of the ball mill rotates, the grinding body is attached to the cylinder liner due to inertia, centrifugal force and friction. Carried away by the cylinder, when it is brought to a certain height, it will be thrown down due to its own gravity. The falling grinding body will crush the material in the cylinder like a projectile.
The material enters the first chamber of the mill uniformly through the feeding device through the hollow shaft of the feeding device. There is a step liner or a corrugated liner in the first chamber of the mill. The chamber is equipped with steel balls of various specifications. Falling after the height has a heavy blow and grinding effect on the material. After the material reaches the rough grinding in the first warehouse, it enters the second warehouse through the single-layer partition board. The warehouse is lined with flat liners and steel balls to further grind the materials. The powder is discharged through the unloading grate to complete the grinding operation.
When the cylinder is rotating, the grinding body also slips off. During the sliding process, the material is grinded. In order to effectively use the grinding effect, when grinding the material with larger particle size, the grinding body is fine. Divided into two sections by a partition board, it becomes a double silo. When the material enters the first silo, it is crushed by the steel ball. When the material enters the second silo, the steel section grinds the material, and the ground qualified material is hollow from the discharge end. When the shaft is discharged to grind the materials with small feed particles, such as sand No. 2 slag, coarse fly ash, the barrel of the mill can be formed as a single-chamber barrel mill, and the grinding body can also be made of steel.
The raw materials are fed into the hollow cylinder through the hollow shaft neck for grinding, and the grinding medium (steel ball, steel rod or gravel, etc.) of various diameters is installed in the cylinder. When the cylinder rotates around the horizontal axis at a certain speed, the medium and raw materials contained in the cylinder will be separated from the cylinder when the cylinder reaches a certain height under the action of centrifugal force and frictional force. The inner wall is projected to fall or roll down, crushing the ore due to the impact force. At the same time, during the rotation of the mill, the sliding movement between the grinding media also has a grinding effect on the raw materials. The ground material is discharged through the hollow journal.
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