FAQ
1. What is a Ball Mill?
Ans. A ball mill is a type of grinder used to grind, blend and sometimes for mixing of materials for use in mineral dressing processes, paints, pyrotechnics, ceramics and selective laser sintering. It works on the principle of impact and attrition: size reduction is done by impact as the balls drop from near the top of the shell.
2. How a Ball Mill Works?
Ans. In case of continuously operated ball mill, the material to be grind is fed from the left through a 60° cone and the product is discharged through a 30° cone to the right. As the shell rotates, the balls are lifted up on the rising side of the shell and then they cascade down (or drop down on to the feed), from near the top of the shell. In doing so, the solid particles in between the balls and ground are reduced in size by impact.
3. What is application of the Ball Mill?
Ans. The ball mill is used for grinding materials such as coal, pigments, and feldspar for pottery. Grinding can be carried out either wet or dry but the former is performed at low speed. Blending of explosives is an example of an application for rubber balls.For systems with multiple components, ball milling has been shown to be effective in increasing solid-state chemical reactivity. Additionally, ball milling has been shown effective for production of amorphous materials.
4. Which are the common types of Grinding Mills?
Ans. The Comman Types of Grinding Mills are. 1. Ball Mill. 2. Tube Mill. 3. Rod Mill. 4. Pebble Mill. 5. Batch Mill. 6. Grate Discharge Mill. 7. Trunnion Ovelflow Mill.
5. Which are the key component of a Grinding Mill?
Ans. The key components of a Grinding mill are Shell Plate, Feed-End Plate, Discharge-End Plate, Manhole, Gear Box, Mill Liners, Grinding Media etc.
6. Which are the main types of Mill Liner?
Ans. The main types of Mill Liners are Solid Steel Liners, Manganese Liner & Rubber Liner.
7. What is Ball Mill Rubber Liner? (Rubber Mill Liner)
Ans. As the interplay of material and configuration is especially significant in rubber liners they are addressed in some detail.
Over the last half century, rubber mill linings have been used successfully in secondary and regrind milling applications and are specified today for these new applications. However, now with improved materials and computer aided design programs they are being used more and more in primary grinding applications. In addition to its abrasion resistance it is also resistant to most chemicals (Elastomers 2002).
The more technical term for rubber is “elastomer”. A good elastomer or rubber for a mill liner would have a elongation of 500 to 600% which means it can be stretched from 5 to 6 times its length without any damage. To go along with this the tensile strength should be around 20.68 MPa (3000 psi). The third important physical characteristic is hardness, and this should be between 55 and 70 durometer on the A scale.
The material used for a rubber mill liner usually consists of a blend of a natural and synthetic rubber. In some applications the material may be all synthetic. The mixture of the rubber and synthetic materials plus various chemicals and fillers is called a ”compound.” Each rubber mill lining manufacturer has their own recipes for their compounds as well as their own designation.
In designing a rubber lining, the same computer tools as described elsewhere in this paper are used. Whether the lining material is metal or rubber the same type of comminution is required in the charge so the same simulation tools can be used with some adjustments for the lining material. For maximum life, rubber likes to have a 90 degree impact, so this is taken into consideration when designing. Many improvements in rubber compounds have been made over the years but current research and development is providing nanotechnology which should further improve wear life in the future.
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Predictable wear life of Rubber Liners allow for advanced ordering and deliveries providing additional cost saving.