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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.
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