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About EE-Tec |
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| Question : Does the milling efficiency increase if mixed size beads are used? |
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Answer : Negative
Narrow bead size distribution is a key factor for high speed milling.
The following problems will occur if mixed size beads are used ,
(1) Separation of big beads and small beads happens during high speed milling. Small beads tends to be pushed to edge of the chamber and the slurry outlet. A local high pressure occurs, and unexpected movement of the small beads will lead to damage of the agitation blades and wall of the chamber.
(2) Big beads tends to damage the small beads. It will cause deformation of small beads and accelerate the problem that described in item 1.
(3) Broadened particle size distribution in the slurry. It is due to different gaps between beads. Slurry tends to “escape” from the narrow gaps which have higher shear while higher shear is an important contribution of milling efficiency.
The picture below shows that small beads deformation by mixing two different size beads.
Data source : Customer Service of EE-TEC
Bead mill machine : Netzsch
Media : 0.65mm + 0.4mm YSZ beads
Slurry : Inorganic slurry |
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