How to select right grinding media for your need?
Views: 1288 Update Date:Nov 09 , 2020
Grinding media comprise a wide range of objects such as grinding media ball, forged steel ball and grinding rod, as well as more rare shapes like cylinders, diagonals and ballcones. The media itself can be composed of a variety of materials, including carbon steel, stainless steel, chrome steel and non-metallics like ceramics.
Selecting the right grinding media for a specific application depends upon several factors, some of which are interrelated:
* Initial feed size – smaller media cannot easily break up large particles.
* Final particle size – smaller media are more efficient when ultrafine particles are desired.
* Hardness – the harder the media, the better the grinding efficiency and, consequently, the longer the wear.
* Costs – media that may be 2–3 times more expensive may last considerably longer, and therefore, be well worth the extra cost over the long run.
* Specific gravity – in general, high-density media give better results. The media should be more dense than the material to be ground. Also, highly viscous materials require media with a higher density to prevent floating.
* Consistency in size – although more important with mini media, ideally one wants all the same size. In these small sizes, there are ranges because, due to the manufacturing process, the media must be classified or screened.
* Discoloration – some media may cause light-colored slurry to turn gray.
* PH – some strong acid or basic slurries may react with certain metallic media.
* Contamination – material resulting from the wear of the media may affect the product and may need to be removed by a magnetic separator, chemicals, or a sintering process.
The type of mill also can affect the selection of grinding media. Ball mills use very large media while horizontal mills require much smaller media, as small as 0.05 mm to 2 mm.
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Selecting the right grinding media for a specific application depends upon several factors, some of which are interrelated:
* Initial feed size – smaller media cannot easily break up large particles.
* Final particle size – smaller media are more efficient when ultrafine particles are desired.
* Hardness – the harder the media, the better the grinding efficiency and, consequently, the longer the wear.
* Costs – media that may be 2–3 times more expensive may last considerably longer, and therefore, be well worth the extra cost over the long run.
* Specific gravity – in general, high-density media give better results. The media should be more dense than the material to be ground. Also, highly viscous materials require media with a higher density to prevent floating.
* Consistency in size – although more important with mini media, ideally one wants all the same size. In these small sizes, there are ranges because, due to the manufacturing process, the media must be classified or screened.
* Discoloration – some media may cause light-colored slurry to turn gray.
* PH – some strong acid or basic slurries may react with certain metallic media.
* Contamination – material resulting from the wear of the media may affect the product and may need to be removed by a magnetic separator, chemicals, or a sintering process.
The type of mill also can affect the selection of grinding media. Ball mills use very large media while horizontal mills require much smaller media, as small as 0.05 mm to 2 mm.
