Compact mills for sharp-edged grains

Products with a steep particle size distribution are produced  with high-pressure grinding rolls .

The high pressure roller mill is also called roller mill or roller press.

The main difference between material bed grinding and compacting is that the pressure forces between the rollers are lower because no new adhesive forces have to be generated.

The material to be ground is transported into the narrowest gap by the friction effects of the rollers rotating in opposite directions. The two rollers are pressed against each other by hydraulics. This grinding force is transmitted in the material to be ground. Extremely high internal stresses are generated as a result of punctiform contact between the individual grains, which ultimately lead to fracture.
Using the optimum grinding power results in compact mills with extremely low energy requirements.
Since only the outermost particles of the material bed are in contact with the roller surface, grinding is almost contamination-free.

The high-pressure grinding rolls are used in continuous operation or in a closed circuit with screening machines or classifiers.

features

• Roller diameter: 228 mm to 1,100 mm
• Working widths from 64 to 1,000 mm
• Drive from 11 kW to 500 kW
• gravity feed
• Screw loading for optimum throughput
• Throughput rates from 0.2 – 120 t/h