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MARUWA alumina balls are used at glass, porcelain enamel, abrasives, cement, pigment, and other ceramic factories, as well as paint factories, chemical factories, and weak electric appliance makers, as powder grinding media for pot mills, tube mills, and vibration mills.
■Features
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High grinding efficiency: The high hardness and large specific gravity of the material itself enhance the grinding efficiency and shorten the grinding time. |
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Long life of balls: The wear resistance is as large as approx. five times that of ordinary porcelain balls. |
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The purity of ground substances can be kept high.: The grinding loss of balls is small, and the quantity of abraded ball material mixed with the ground substances is small; therefore, the purity of ground substances can be kept high. |
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■Material
The material is dense corundum crystalline made by high-temperature sintering of A-192, A-189, or A-185 material, which contains high-purity Alumina (α-Al2O3). The material has high hardness, stickiness, and impact strength, excelling in the wear resistance, heat resistance, and chemical stability at high temperatures. The comparison of properties with ordinary porcelain and agate balls is shown below.
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Description
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MARUWA materials
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General materials
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| Material |
A-192 |
A-189 |
A-185 |
Ordinary porcelain |
Agate ball |
| Alumina content (%) |
92 |
89 |
85 |
- |
- |
Apparent
specific gravity |
3.5 |
3.5 |
3.5 |
2.4 |
2.6 |
| Color |
white |
white |
white |
white |
Gray, dark brown, etc. |
Hardness
(Rockwell 15 N) |
93 |
93 |
93 |
70 |
70~80 |
Compressive
strength (GPa) |
>1.5 |
>1.5 |
>1.5 |
0.2 |
- |
| Porosity (%) |
0 |
0 |
0 |
0 |
0 |
| Features |
Great wear resistance |
Great wear resistance |
Great wear resistance |
- |
- |
| Adaptive part No. |
MHQ-20 (Φ20mm)
MHQ-30E(Φ30mm) |
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MHQ-30 (Φ30mm) |
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- |
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■Ball materials and their features
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A-192 is recommended for ordinary wet grinding with small-diameter balls (20Φor less). The wear resistance is far greater than that of A-189. |
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Be sure to use A-185 for white cement clinker grinding, ceramic material grinding, and other dry grinding purposes.
The impact resistance and chipping resistance during dry grinding are excellent. |
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■Performance comparison test of various ball materials
| Material |
Ball shape |
Apparent
specific gravity |
Volume in
pot mill*1 |
Pot mill
speed |
Dosage
of balls |
Ground
object*2 |
Water |
| A-192 |
BallΦ20 |
3.5 |
7L |
88rpm |
3kg |
3kg |
2kg |
| BallΦ30 |
3.5 |
7L |
88rpm |
3kg |
3kg |
2kg |
| A-189 |
BallΦ30 |
3.5 |
7L |
88rpm |
3kg |
3kg |
2kg |
| A-185 |
BallΦ30 |
3.5 |
7L |
88rpm |
3kg |
3kg |
2kg |
Ordinary
porcelain |
BallΦ30 |
2.4 |
7L |
88rpm |
3kg |
3kg |
2kg |
| Silica |
Flat egg shape
Φ30~40 |
2.6 |
7L |
88rpm |
3kg |
3kg |
2kg |
*1 Ordinary porcelain pot mill of Φ220 in inner diameter
*2 Quartz rock 10-250 mesh |
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■Wear resistance test
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COPYRIGHT 2009 MARUWA Co., Ltd. ALL RIGHT RESERVED.
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