Ball Mill for Limestone Grinding
Limestone grinding in ball mills is an important technological process applied to reduce the size of particles which may have different nature and a wide diversity of physical, mechanical and chemical characteristics. The applications of ball mills are ubiquitous in mineral processing and mining industry, metallurgy, cement production, chemical industry, pharmaceutics and cosmetics, ceramics, different kinds of laboratory studies and tests. Besides particle size reduction, ball mills are also widely used for mixing, blending and dispersing, amorphisation of materials and mechanical alloying. SBM provides the ball mill for limestone grinding process.
Limestone grinding ball mill
Limestone ball mill is a versatile grinding mill and has a wide range of applications. The mill can vary in size from small batch mills up to mills with outputs of hundreds of tonnes per hour. They are the most widely used of all mills. Small hand operated ball mills are used in Bolivia for preparation of ore, sand and gravel.
Limestone ball mill consists of a cylindrical drum, sometimes tapered at one end, and usually has a charge of steel balls (up to 40% by volume) ranging in size up to 125mm for larger mills. Product size can be as small as 0.005mm, but product size is dependant upon the time the charge spends in the grinding zone and therefore the reduction rate is a function of the throughput. The lining material is of great importance as there is a significant amount of wear taking place due to the action of the steel balls. The speed of rotation is optimum at about 75% of critical speed. Some mills are compartmentalised with each subsequent section having a smaller ball size.
Limestone ball mill advantages
- Intensify the fineness of the mixture and make the graininess of the mixture and structure reasonable;
- Milling makes the mineral matrix defect increased, the increased new matrix defect raise the activity of the surface of mineral;
- The material malleability is intensified through twisting and extruding in the course of milling;
- When the binder has close contact with the ore grains, the adhesive force between binder and ore grains increase, the coarse grains are wrapped up into the internal of the ball through this adhesive force.