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Because of the high moisture content of sample, it is not possible to dry grind this sample. It might be possible after a previous drying step. In our case, we performed a grinding in suspension.
The sample has been ground to a homogenous mush within 3 minutes. No longer fibrous particles have been found. We proceed grinding for a total of 10 minutes. After 10 minutes, we checked the fineness using our Laser Particle Sizer ANALYSETTE 22 NanoTec plus. We found a d50 < 6,35 µm which use to fulfill the desired task of d50 < 20 µm.
Grinding has been aborted. Probably 5 minutes of grinding might be fulfilling to receive the desired fineness too.
We recommend grinding as short as possible, because after grinding, it has shown that balls show a light discoloration, caused by direct contact when balls will hit the bowls wall directly. This light discoloration can be removed by short grinding time of sand and water.
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