Ball Mill

Introduction

Ball mill is the key machinery for further smashing broken materials. Ball mill is suitable for crushing various ores for rotary kiln. Ball mill is widely used in many sectors like mineral processing, building materials and chemical industry. Ball mill can be divided into dry type and wet type; According to different mine discharge types, it can be divided into lattice type and overflow type; According to the shape of cylinder, it can be classified into short tube ball mill, long tube ball mill, tube mill and cone mill; Other types are rod ball mill, cement ball mill, ultra-fine laminating mill, hand ball mill, horizontal ball mill, energy-saving ball mill, and ceramic ball mill.

operation movement in bill mill

Ball Mill Working Principle

Ball mill is composed of horizontal cylinder, inlet and outlet hollow shaft, grinding head and so on. Ball mill’s cylinder is a long drum which is built of steel plate. Inside the cylinder there is a grinding body. The grinding body is a steel ball that is fixed with cylinder on a steel plate. Materials go into the cylinder by the feed-end hollow shaft.

The grinding body is absorbed on cylinder’s lining because of inertial, centrifugal and friction forces while ball mill is rotating. When the grinding body is lifted on a certain height, it falls down because of its own gravity and shatters materials inside the cylinder like a projectile.
Through feed-end hollow shaft, materials spiral evenly enters the first mill bin. Inside the bin, various specifications of steel balls are put between step liners or corrugated liners. The centrifugal force caused by cylinder rotation grabs steel balls and drops them in a certain height. It creates heavy blows and grinding on materials. Materials go through rough grinding in the first bin, then enter the second bin through a single-layer compartment board. Inside the second bin, steel balls are further grinding materials between flatliners. After the powder is discharged through the discharge raft, grinding process is done.

entity of ball mill

Ball Mill Mechanical Structure

Ball mill’s main structure contains the feeding part, discharging part, turning part and transmission part (reduction gear, small transmission gear, motor, and electric control).


Ball mill’s main engine includes cylinder, wear-resistant lining in the cylinder, bearings which bear the cylinder and maintain its rotation and drive section such as motor, transmission gear, pulley, and triangle belt.

animation of ball mill

Operation Parameters

Specifications And ModelsBarrel Speed(r/min)The Load Ball(t)Feed Particle Size(mm)Discharging Granularity(mm)Output(t/h)Motor Power(kW)Total Weight(t)
Ф900×180036-381.5≤200.075-0.890.65-218.55.85
Ф900×3000362.7≤200.075-0.891.1-3.5226.98
Ф1200×2400363≤250.075-0.61.5-4.83013.6
Ф1200×3000363.5≤250.074-0.41.6-53714.3
Ф1200×450032.45≤250.074-0.41.6-5.85515.6

Ball Mill Characteristics

  1. Ball mill has high output, low energy consumption
    This machinery optimizes the traditional ball mill’s production process. This ball mill is economical and environmental-friendly, which highly enhances working efficiency and reduces power consumption.
  2. Ball mill has convenient lubrication
    The main bearing uses grease as its lubricating oil, which is convenient and clear, so it can avoid heavy mental pollution. Therefore, this ball mill only needs little maintenance with less expense.
  3. Ball mill’s bearing leading to longer service life
    Using antifriction bearing not only adds loading ability but also extends its service life. It settled the problem of shutting down caused by overheating. So, it extents five percent working life.
  4. Ball mill’s wear-resistant cast steel parts in the hollow shaft
    Hollow shaft adopts movable lining with steel-casting. And it has a wear-resistant lining plate to update its abrasive resistance.

Ways To Make Ball Mill More Efficiency

parts' name in ball mill
  • Extent efficient volume of ball mill
    Increasing the effective volume of the mill can increase mill productivity. The thickness of the liner and the weight increase the power consumption, reduce the effective volume of the cylinder, and reduce the production efficiency of the ball mill. If the magnetic lining plate is selected, the effective volume of the cylinder can be increased, and the weight is relatively reduced, and the power consumption is reduced. However, the use of a thinner magnetic liner also has certain drawbacks. Because of its small thickness, the impact resistance is not as good as the current Cr-Mn-Mo alloy cast steel liner, which is prone to cracking. For example, some manufacturers adopt a grooved annular lining for the lining problem, which increases the contact surface of the ball ore, enhances the grinding effect, and has the ability to lift the ore, reduce energy consumption, and is widely used.
  • Increase filling rate and a transfer rate of ball mill
    The processing capacity of the ball mill increases with the increase of the filling rate of the steel ball. It increases the probability of grinding the ore and the self-grinding effect. When the ball filling rate is 45%, the ball mill load is the largest, and when it exceeds 45%, the load is greatly reduced as the filling rate increases. This is mainly because as the filling rate increases, the ball throwing point is raised, and the combined action point of the falling of the steel ball accelerates toward and closes to the center of rotation, and the resultant moment is greatly shortened to become a negative value. The load requires for the impact torque of the steel ball (mineral) falls from large to zero until it becomes the power to push the cylinder to rotate.
  • Transform grinding medium of ball mill
    The elliptical ball medium can be used instead of the existing ball medium. The advantages of the elliptical ball compared with the round ball are as follows: compared with the spherical body, the ellipsoidal ball can greatly improve the crushing and grinding ability of the ball mill, and at the same time, the equipment loss is correspondingly reduced.
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