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P6 Planetary Ball Mill
The P6 is a high-speed planetary ball mill suitable for particle size reduction and homogenising powder samples, particularly for XRF measurement. It can quickly and efficiently reduce powders to tens of microns in size.
Grinding balls and bowls in a range of materials and capacities
Maximum useful sample capacity of 450 ml
User friendly safe-lock-system to prevent accidents
Easily grind hard, medium-hard, brittle and moist materials
Grinding Media
As grinding media we recommend either zirconia or for harder materials tungsten carbide if you are not sure, this will suit the majority of applications. The maximum feed size is 10mm in diameter.
Material (bowl+balls)
Main components of the material
Density (g/cm3)
Abrasion resistance
Sample type
Agate
(99.9% SiO2)
2.65
Good
Soft samples
Zirconium oxide
(96.2% ZrO2)
5.7
Very good
Fibrous, abrasive samples
Tungsten carbide
(93% WC+6% Co)
14.9
Very good
Hard, abrasive samples
Silicon nitride
(90% Si3N4)
3.25
Extremely good
metal-free grinding
Hardened steel
Bowl: (11-12% Cr)
Balls: (1.0-1.65% Cr)
7.9
Good
Hard, brittle samples
Sample Volume
A typical mill to reduce the size of the solid and to produce a homogenous powder, which can be used in the pellet press, is a Planetary ball mill. The P6 is able to work with one 250ml bowl for 100ml of sample or with two 80ml bowls with 30ml of sample.
Number of grinding balls per bowl
Ball diameter (mm)
Number of balls (80 ml bowl)
Number of balls (250 ml bowl)
5
250 - 300
1200 - 1300
10
25 - 30
50 - 150
15
10
45 - 50
20
5
15 - 20
30
-
5-6
Results
The specification for the particle size is typically < 45 µm. After 10 minutes of grinding cement clinker in a 250 ml bowl the following particle size distribution is obtained:
The result is that 99.4% of the sample is reduced to under 45 µm after ten minutes. The two peaks correspond to material found at the center (larger particles) and edges (smaller particles) of the bowl.