Dry ball mill
Introduction of Dry Ball Mill
Dry Ball Mill grinds material by rotating a cylinder with steel grinding balls, causing the balls to fall back into the cylinder and onto the material to be ground.
The rotation is usually between 4 to 20 revolutions per minute, depending upon the diameter of the mill. The larger the diameter, the slower the rotation. If the
peripheral speed of the mill is too great, it begins to act like a centrifuge and the balls do not fall back, but stay on the perimeter of the mill. The point where the
mill becomes a centrifuge is called the Critical Speed", and ball mills usually operate at 65% to 75% of the critical speed.
Application of Dry Ball Mill
They are generally used to grind material 1/4 inch and finer, down to the particle size of 20 to 75 microns. To achieve a reasonable efficiency with ball mills,
they must be operated in a closed system, with oversize material continuously being recirculated back into the mill to be reduced. Various classifiers, such
as screens, spiral classifiers, cyclones and air classifiers are used for classifying the discharge from ball mills. Ball mill is an efficient tool for grinding many
materials into fine powder. The ball mill is used to grind many kinds of mine and other materials, or to select the mine. It is widely used in building material,
chemical industry, etc. There are two ways of grinding: the dry process and the wet process. It can be divided into tabular type and flowing type according to
different forms of discharging material.
Working Principle of Dry Ball Mill
The ball mill is a horizontal rotating device transmitted by the outer gear. The materials are transferred to the grinding chamber through the quill shaft uniformly.
There are ladder liner and ripple liner and different specifications of steel balls in the chamber. The centrifugal force caused by rotation of barrel brings the steel
balls to a certain height and impact and grind the materials. The ground materials are discharged through the discharging board thus the grinding process is finis
hed.
Technical parameters of Dry Ball Mill
Model and specification |
Shell Rotation
Speed(r/min) |
Ball Load
(t) |
Feed size
(mm) |
Discharge
size(mm) |
Capacity
(t/h) |
Power
(kw) |
Weight
(t) |
Φ800×1800
|
38
|
1.5
|
0-15
|
0.075-0.8
|
0.3-0.8
|
Y11-4
|
2.1
|
Φ900×2100
|
38
|
2
|
0-15
|
0.075-0.8
|
0.5-1.3
|
Y15-4
|
3.2
|
Φ1200×2800
|
35
|
4.8
|
0-20
|
0.075-0.8
|
1.2-3.7
|
Y30-6
|
11.5
|
Φ1500×3500
|
28
|
8
|
0-25
|
0.075-0.8
|
3.3-8.8
|
Y55-75-6
|
16.5
|
Φ1830×3500
|
25
|
13
|
0-25
|
0.075-0.8
|
4-8
|
Y150-6
|
30
|
Φ2100×2700
|
24
|
15
|
0-25
|
0.075-0.8
|
3.5-25
|
Y150-8
|
33
|
Φ2100×3500
|
24
|
20
|
0-25
|
0.075-0.8
|
4.533
|
Y180-8
|
37
|
Φ 2200×7000
|
21
|
24
|
0-25
|
0.075-0.8
|
8-36
|
Y380-8
|
50
|
Note: The technical parameters above are just for your reference. If there is any change, all parameters and overall dimension are subject to operating instructions. Any questions please feel free to contact us.
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