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Power Draw and Scale-Up of Stirred Media Mills

✍ Scribed by Michael Becker; William N. Ford; Oliver Gutsche

Publisher
John Wiley and Sons
Year
2001
Tongue
German
Weight
46 KB
Volume
73
Category
Article
ISSN
0009-286X

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✦ Synopsis

The physical model to describe comminution and dispersion processes is based on the idea that the comminution result is determined by the number of stress events, SN, and the stress intensity, SI. Thus, comminution behaviour of a mill is characterized by the frequency of stress events, SF, and the stress energy acting at a stress event, SE. The product SFΒ΄SE is proportional to the power input and the product SNΒ΄SE to the specific energy of the mill, E m,M . The proportionality factor, g E , is the energy efficiency factor and describes the percentage of friction and other losses. Thus, the comminution result is fixed, if two of the three parameters SN, SE and g E Β΄Em,M are set. A mill can be characterized by g E and the distributions of SF and SE. If these mill characteristics are compared with the breakage characteristics of the feed material, the performance of different mills and different operating states can be evaluated. 376 Constant Grinding Conditions at Scale-up of Stirred Media Mills D i p l . -I n g . H . -H . S t e n d e r * ) D r . -I n g . A . K w a d e * * ) P r o f . D r . -I n g . J . S c h w e d e s * )

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