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From Apache Wiki <>
Subject [Httpd Wiki] Update of "xiaoyinggu" by xiaoyinggu
Date Fri, 12 Nov 2010 07:58:14 GMT
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The "xiaoyinggu" page has been changed by xiaoyinggu.


  Ball mill is characterized by their smaller (comparatively) diameter and longer length.
The feed is at one end of the cylinder and the discharge is at the other. Ball mill is commonly
used in the manufacture of. This industrial ball mill is mainly big machines. Small versions
of ball mill can be found in laboratories where they are used for grinding sample material
for quality assurance. The power predictions for ball mill typically use the following form
of the bond equation:Ball mill is normally operated at around 75% of critical speed, so a
mill with diameter 5 meters will turn at around 14 rpm. The mill is usually divided into at
least two chambers, allowing the use of different sizes of grinding media. Large balls are
used at the inlet, to crush clinker nodules (which can be over 25 mm in diameter). Ball diameter
here is in the range 60-80 mm. In a two-chamber mill, the media in the second chamber is typically
in the range 15-40 mm, although media down to 5 mm is sometimes encountered. As a general
rule, the size of media has to match the size of material being ground: large media can't
produce the ultra-fine particles required in the finished cement, but small media can't break
large clinker particles. Mills with as many as four chambers, allowing a tight segregation
of media sizes, were once used, but this is now becoming rips. Alternatives to multi-chamber
mills are: Pairs of mills, run in tandem, charged with different-sized media. Use of alternative
technology (see roll-presses below) to crush the clinker prior to fine-grinding in a ball
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