Ball mill is a kind of grinding equipment that can be used to grind many ores. The ball mill has the following characteristics: small specific energy consumption，good mixing effect，low noise，easy operation and maintenance. It can be divided into two types：dry type and wet type according to different ways of discharging material.
The dry type is also called grate type or overfall type due to different ways of discharging material: dry type is taking off from the top of the discharge port by using a grate or overfall pattern; wet type is taking off from both sides at an angle with water spraying from above and below.
The ball mill is a key equipment to grind the crushed materials，and the ball mill is widely used in powder-making production line including cement、silicate、new-type building material、refractory material、fertilizer、ore dressing of ferrous metal and non-ferrous metal、glass ceramics，and the ball mill can grind various ores and other materials with dry type and wet type. There are two kinds of ball mill， grate type and overfall type due to different ways of discharging material.
Grate Type Ball Mill: This machine has a large amount of steel wire mesh (grate) installed in a case, which divides the space into many small grinding areas through which minerals are fed into inlet hopper. The grate is turned by motor by rolling around it horizontally or vertically. The mineral particles fall down through openings between wires while being ground by balls that move up and down on them as they tumble around inside their cages made from wire mesh screens
Overfall Type Ball Mill: It consists of elastic tube shaking device arranged vertically or horizontally connected to an axle at its top end; there are one or more rotating wheels equipped with steel balls inside tubes mounted on this axle; when electricity power source rotates these wheels, mineral particles will be fed into tube shaking device through feeder hopper
It is widely used in building material，chemical industry，etc.
It is widely used in cement, silicate, new-type building material, refractory material, fertilizer, ore dressing of ferrous metal and non-ferrous metal, glass ceramics.
There are two ways of grinding: the dry way and the wet way. The dry way is to grind material with a dry powder as its grinding medium, and the wet way is to grind material with liquid as its grinding medium.
The former is often used for coarse grinding, while the latter is used for fine grinding or wet processing of powders into granules or pellets.
The ball mill is a key equipment to grind the crushed materials, and the ball mill is widely used in powder-making production line including cement, silicate, new-type building material, refractory material, fertilizer, ore dressing of ferrous metal and non-ferrous metal etc. The Ball Mill is a key equipment for grinding after materials are crushed. It is widely used for the dry type or wet type mixing of the raw materials as well as for the fine powders blending of all kinds of ores in mining industry.
In order to produce more refined powder products from coarse powders by grinding process under high speed rotation condition，the machine must be designed with a reasonable structure：1)The main shafts should be supported by roller bearings so that they can rotate smoothly; 2)The grinding balls should run around on special bearing platforms called raceways; 3)Due to different sizes of balls rolling at different speeds during operation at any time some parts may be overloaded while others may not be loaded enough which will affect their service life significantly; 4)When it comes into operation，the safety switches will stop machine immediately if overloading occurs or overheating happens due to abnormal working conditions such as voltage fluctuations etc.,
The body and ground plank are an integral whole. So when fixing, it can be lowered on a plane surface once only. Use double tiered roller axletree with centripetal spherical surface as the support of the host axletree can reduce energy cost by 30%. The intrinsic grille pattern forcing evacuation is instead by over fall pattern controlling one. This can improve the milling of the granule and the quantity dealt with is reduced by 15-20%.
In the end, I hope that this article has given you a good understanding of how ball mills work. If you have any questions or comments about the topic, feel free to leave them in the comments section below!