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Difference between revisions of "Ball Mills"
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[[Category:Particle Size Reduction]]{{Knoppen}} | [[Category:Particle Size Reduction]]{{Knoppen}} | ||
[[File:High-energy_ball_milling.gif | thumb | right |High-energy ball milling ]] | [[File:High-energy_ball_milling.gif | thumb | right |High-energy ball milling ]] | ||
[[File:Ball_mill1.jpg| thumb | right |Lead antimony grinding media with aluminum powder.]] | [[File:Ball_mill1.jpg| thumb | right |Lead antimony grinding media with aluminum powder.]] | ||
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[[File:Ball_mill4.jpg | thumb | right | Laboratory scale ball mill]] | [[File:Ball_mill4.jpg | thumb | right | Laboratory scale ball mill]] | ||
[[File:Ball_mill3.gif | thumb | right | Principle of a Ball mill]] | [[File:Ball_mill3.gif | thumb | right | Principle of a Ball mill]] | ||
A '''ball mill''' is a type of grinder used to grind materials into extremely fine powder for use in mineral dressing processes, paints, pyrotechnics, and ceramics. | A '''ball mill''' is a type of grinder used to grind materials into extremely fine powder for use in mineral dressing processes, paints, pyrotechnics, and ceramics. | ||
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== Varieties == | == Varieties == | ||
[[Planetary Ball Mills]] are smaller than common ball mills and mainly used in laboratories for grinding sample material down to very small sizes. A planetary ball mill consists of at least one grinding jar which is arranged eccentrically on a so-called sun wheel. The direction of movement of the sun wheel is opposite to that of the grinding jars (ratio: 1:-2 or 1:-1 or else).The grinding balls in the grinding jars are subjected to superimposed rotational movements, the so-called Coriolis forces. The difference in speeds between the balls and grinding jars produces an interaction between frictional and impact forces, which releases high dynamic energies. The interplay between these forces produces the high and very effective degree of size reduction of the planetary ball mill. | |||
==History== | ==History== | ||
Devices for shaking materials along with hard balls might be old, but it was not until the industrial revolution and the invention of steam power that a machine could be built. It is reported to have been used for grinding flint for pottery in 1870. | Devices for shaking materials along with hard balls might be old, but it was not until the industrial revolution and the invention of steam power that a machine could be built. It is reported to have been used for grinding flint for pottery in 1870. | ||