Ball Mill

Ball mill is the material to be broken, and then smash the key equipment. It is widely used in cement, silicate products, new building materials, refractory materials, fertilizer, black and non-ferrous metals and glass ceramics and other production industries of all kinds of ores and other grind-able materials can be dry or wet grinding. Ball mill for grinding various ores and other materials, dry and wet grinding methods are widely used in mineral processing, building materials and chemical industry can be divided into. According to different ways of discharge can be divided into lattice type and overflow type two.

Ball mill one of the high-fine grinding machine is widely used in industrial production, which there are many types, such as a tube mill, a rod mill, cement mill, ultrafine mill lamination, hand ball mill, horizontal mill, ball bearing, energy-saving ball mill, overflow ball mill, ceramic ball mill, grid ball mill. Ball mill for grinding various ores and other materials, dry and wet grinding methods are widely used in mineral processing, building materials and chemical industry can be divided into. According to different ways of discharge can be divided into lattice type and overflow type two. According to the shape of the cylinder can be divided into short tube mill, long-barreled ball mill, a tube mill and conical mill four.

Ball Mill Working Principle

Ball mill is from the cylinder, out of the hollow shaft and grinding head and other parts of the horizontal composition of the cylinder for the long cylinder, cylinder with grinding, cylinder is of steel manufacturing, there is a steel cylinder liner and fixed grinding Usually made of steel spheres, according to a certain percentage of different diameters and loading cylinder, grinding steel segment can also be used. According to the granularity of abrasive material should be selected, materials by ball mill feed end of the hollow shaft is arranged in the tube body, when the ball mill cylinder rotation time, grinding body due to inertia and centrifugal force, friction force, making it attached to the barrel lining board is take the cylinder, when they were brought to a certain height when, due to its own gravity and being thrown off, whereabouts, grinding body like a projectile will materials in the cylinder body to crusher.

Material from the feed device evenly into the mill first warehouse into the compound by the air shaft spiral, the warehouse there are ladder liner or corrugated liner, built with a variety of balls, rotating cylinder produces centrifugal force to the ball a certain after the height of the fall, have severe impact on the material and abrasive. Material in the first position to reach coarse grinding, through the single-compartment plate into the second warehouse, the warehouse lined with flat lining, steel ball inside, the material further grinding. Powder is discharged through the discharge grate plate to complete the grinding operation.

During the rotation of the cylinder, the grinding media have dropped the phenomenon, in the process of falling to the material to abrasive action, in order to effectively use abrasive effect on the material size larger general purpose Ground twenty when the mill body cylinder plate with a compartment divided into Sec, becomes two-position, the material into the first position when the ball was crushed, the material into the second position when the steel section of the material for grinding, grinding the material passing from the discharge end of the hollow shaft discharge, small particles of feed materials for ground, such as when the 2nd slag sand, coarse fly ash, mill shell not to set partitions, a single-chamber tube mill, grinding can also be of steel segments.

Raw materials through a hollow shaft neck to into the hollow cylindrical grinding, the inner cylinder is equipped with a variety of diameter of grinding medium (ball, steel bar or gravel, etc.). When the cylinder around a horizontal axis at a certain rotation speed, medium and raw materials in the barrel is arranged in the role of the centrifugal force and friction force, as the cylinder reaches a certain height, when self gravity is greater than the centrifugal force, from the inner wall of the barrel body projectile falling or roll, the impact crushing ore. At the same time, during the rotation of the mill, the sliding motion between the grinding media and the grinding media also has a grinding effect on the raw material. After grinding the material through the hollow shaft discharge.

Ball Mill Improve Efficiency

1. increase the effective volume: Increase the effective volume of the mill can be an increase mill productivity, lining thickness, weight, increased power consumption, but also reduces the effective volume of the cylinder, reducing the productivity of the Ball mill. Such as the use of magnetic liner, it can increase the effective volume of the cylinder, while the weight is relatively reduced, power consumption is reduced. However, use a thin magnetic lining also has some drawbacks, due to the small thickness, resisting ability as good as a Cr-Mn Mo alloy steel liner active, prone to cracking problems. For example, some manufacturers use problem liner trench ring liner, increased ball contact surface mining, milling strengthen the role and enhance the capacity of the ore has reduced energy consumption, are widely used.

2. Increase in fill rate and transfer rate: Ball mill processing capacity with the ball filling rate increases, improving the filling rate increases ball mill crushed ore and ore chance autogenous grinding effect. Ball filling rate at a maximum load of 45% Ball mill, with the filling rate of increase in its load dropped significantly more than 45%. This is mainly because the filling rate increases, throw the ball from point is raised, the ball hit the joint effect of falling red dot near the center of rotation to accelerate and exceed its combined torque is greatly reduced and becomes negative to O, steel balls (including mine) hit down the impact of closing large torque required by the load becomes 0, until becomes driving force behind the rotating cylinder (ie, beyond the center point of force, resultant moment is negative).

3. Grinding media shape change: Medium oval ball can be used instead of the active media sphere, ellipsoid compared with the sphere, its advantages are as follows:

  • 1. Oval ball with ball diameter compared to an increase of 62% by weight, impact resistance, improved crushing capacity;
  • 2. Between the oval ball by the line contact instead of point contact between the ball contact area four times larger than the ball, the material has good selectivity crushing and sieving effect, uniform particle size, reducing over crushed phenomenon;
  • 3. Oval ball with ball diameter compared to the ball surface area increased by 8%, increasing the contact surface of the ball and the material medium, to improve the grinding capacity;
  • 4. Oval ball mill liner is in contact with the line instead of point contact ball, reducing wear and tear on the liner ball media, reducing media and ball mill liner impact, thereby reducing the medium and ball mill machine liner wear and prolong the service life;
  • 5. Oval sphere also has anti-static, anti-moisture effects, can reduce the adsorption of fine powder mill reducing saturated phenomenon.

Technical Data

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