Dried biomass

By standard, smallest available sieve cassette uses to have 250 µm openings. Smaller sieves like the used 0,1 mm sieve cassette of this trial are available, but we only recommend using such small sieves for grinding of very brittle samples like coal or coke.

As requested, we also tried grinding the sample with 0,1 mm trapezoidal perforation in this trial.

After 4:40 minutes, the airflow of the cyclone separator collapsed. Remaining sample inside the grinding chamber has been attached to the sieve cassettes surface by the vacuum. Even switching off and on, of the cyclone separator did not improve the result.

We aborted the grinding process. Only 29 g of ground sample have been found in the collecting glass of the cyclone separator. A grinding of the desired amount of 2 kg of sample is not possible.

We recommend choosing a bigger sieve (e.g. 250 µm standard sieve cassette). For this, see result 2.

The remaining sample has been used for this trial. With a slow feed rate, complete sample amount has been ground successfully within 11 minutes. By this, a feed rate of 50-60 g/min is possible.

After grinding, already 585 g of output has been found in the collecting glass of the cyclone separator. Sieve cassette and grinding chamber use to be free of residue, a grinding of the desired amount of sample is possible. We are guessing that a total grinding time of 30-35 minutes might be required.