Mineral Processing

Ball mill

Ball Mill

Capacity: 1-95t/h

Feeding size: <20mm

Output size: 0.074-0.4mm

Application: Gold, rock, sand, cement, quartz, silica sand etc., as well as copper, lead, zinc, chrome and other ores for grinding


Introduction: The ball mill is a tumbling mill that uses steel balls as grinding media. Ball mills can be used in wet or dry systems for bulk and continuous milling, and are most widely used in small or large-scale ore beneficiation plant.

  • Dry grinding: suitable for materials that react with water, such as building stones such as cement and marble. Due to the lack of water resources in some arid areas, dry grinding can also be used in order to save water.
  • Wet grinding: suitable for most materials, various metal ores and non-metal ores. Common ones include gold ore, copper ore, iron ore, molybdenum ore, phosphorus ore, feldspar ore, fluorite ore, etc.

The feed can be dry with a water content of less than 3% to minimize the coverage of the ball, or it can be a slurry with a water content of 20-40%. The ball mill can be used for primary or secondary grinding applications. In the primary application, they receive feed from the crusher, and in the secondary application, they receive feed from the rod mill, autogenous mill or semi-autogenous mill.

Main Parts: The mill includes motor, reducer, slow drive, power distribution control cabinet, feeding device, main bearing, rotary part, discharging device, transmission part, lubrication system (mainly including high-pressure pump station and low-pressure thin oil station) and other parts. The main working part of the ball mill is a rotary cylinder mounted on two large bearings and placed horizontally. The cylinder body is divided into several compartments by a partition plate, and a certain shape and size of grinding body is installed in each compartment. The grinding bodies are generally steel balls, steel forgings, steel rods, pebbles, gravel and porcelain balls. In order to prevent the barrel from being worn, a liner is installed on the wall of the barrel. The length of a cylindrical shell is usually 1–1.5 times the diameter of the shell.

Types: Mining ball mills are divided into two categories, Overflow ball mills: center discharge ball mills; Lattice type ball mills: Peripheral row ore type ball mill.
Batch small ball mill: control the particle size of the material by adjusting the grinding time.

working principle of ball mill

The material is fed into the barrel of the ball mill through the hollow shaft. The cylinder of the ball mill is driven by the motor to rotate, and the materials and media in the cylinder rotate at a certain speed to move, and the forces included include gravity, centrifugal force and friction. When the grinding medium reaches a certain height with the cylinder, when the self-weight is greater than the centrifugal force, it will break away from the inner wall of the cylinder and fall or roll down. As the gravitational potential energy is converted into kinetic energy when falling, the steel ball will eventually collide with the ore at a certain final speed, and the ore will be crushed by the impact force. The crushed and qualified materials are discharged through the ore discharge port.

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ball mill

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