But if the ratio is too small, the thin slurry will lead to
the direct impact of the grinding media to increase the wear and tear of
the grinding body, also cause increased evaporation in the spray-drying
process, which could waste the fuel and decrease the discharging ratio
of spray drying tower.
Usually for ore containing more plasticity raw
materials, the ratio is smaller; the ratio should be larger is more
barren raw materials are contained.
The grinding medium and materials within the ball mill have three kinds of moving states because of the different rotating speed of the ball mill: drop motion; throwing motion; centrifugal motion.
The normal
working states of ball mills
are drop motion and throwing motion.
According to the observation, the
more close to the ball mill cylinder, the more the amount of the
grinding medium.
Only making full use of the outermost layer of the
material can make the maximum efficiency of the ball mill.
By the
theoretical calculation that, when the outermost grinding media
detachment angle of 54.73 °, the outermost layer can obtain the maximum
falling height of the material in the most effective pulverization.
Found from the actual operation, when the operating speed of the ball
mill is adjusted to critical speed of 0.75 to 0.85, the grinding medium
could reach higher place.
In the ore separating line, the ball in a ball mill is continuously worn.
In order to maintain a
stable operation of the ball mill and to maintain a reasonable ratio of
the filling rate, balls must be reasonably complemented. Reasonable
complement of balls is one of the key issues to improve the efficiency
of the grinding process.
Regularly check the ball mill in accordance
with its actual situation, accumulate data, revise the ratio, and
finally reach a stability ball charge ratio and reasonable purpose of
the complement ball.
Normal complement ball only refer to a large ball,
and users do not make up a small ball, because the ball can be worn by
the big ball.
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