raw clay

With a gap setting of ~ 0,3 mm; most of the resulting particles will show a fineness < 500 µm as desired.

After 75 seconds of grinding, the complete amount of sample has been ground successfully. Particles bigger as 2 cm can jam the feeding funnel. In this case, it is recommended using e.g. a piece of wood to support the feeding process. Also a pre comminution of bigger particles (manually with a hammer or e.g. a Jaw Crusher PULVERISETTE 1 Model I) is possible.

By the amount inside of the collecting vessel, a grinding of up to 1 kg of sample is possible and might need about 3 minutes to be ground.

After grinding, about 8 ± 3 of sample use to remain mainly loose inside of the grinding chamber and can be brushed out easily.

To determine the achieved fineness, we sieved an aliquot of ~ 25 g of sample with a Vibratory Sieve Shaker ANALYSETTE 3 and a test sieve with 500 µm mesh.

Already 95,8 % of ground sample has been able to pass a 500 µm test sieve.

Also the sent reference of desired fineness has been sieved and has shown a fineness of only 78,9 % < 500 µm.

For this, the desired fineness has been fulfilled. Probably a gap setting between 0,3-0,4 mm result in particles of ~ 80 % < 500 µm too and the grinding speed will be increased.