Roller mills are indeed more energy efficient and more efficient in producing smaller particle sizes compared to hammer mills.
4 Key Points to Consider
1. Energy Efficiency
Roller mills are typically around 25 to 30% more energy efficient than hammer mills.
This is because roller mills do not require an air assist system to pull material through the filtering screens, unlike hammer mills.
The absence of this air assist system reduces the energy consumption of roller mills.
2. Particle Size Reduction
Hammer mills use rapidly rotating hammers to collide with the material until it is reduced to the desired size and can pass through a screen.
Hammer mills can use either hard or soft hammers.
Hard hammers impact the material with a flat surface, resulting in greater particle size reduction and wider particle size distribution.
Soft hammers, on the other hand, use sharp, knife-like edges to slice apart the material, achieving less particle size reduction but a narrower particle size distribution.
3. Material Friability
One potential drawback of using a hammer mill is when the material itself is not intrinsically friable.
This means that the material does not easily crack or break under the application of force.
Intrinsic friability is important because it allows the material to break apart into smaller particles.
If the material is not intrinsically friable, the particle size reduction achieved by a hammer mill may be limited.
4. Summary
In summary, roller mills are more energy efficient and can achieve smaller particle sizes compared to hammer mills.
Roller mills do not require an air assist system, reducing energy consumption.
Hammer mills use hammers to collide with the material for particle size reduction, but their effectiveness depends on the material's intrinsic friability.
Continue exploring, consult our experts
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