|Geology / mineralogy|
|< 3,5 cm|
|< 0,5 mm|
|Using a Disk Mill PULVERISETTE 13 is one of the possibilities for a comminution of raw clay.|
gap setting: 0,3 mm
grinding disks made of hardened steel cast
||500ml (365 g)|
||< 35 mm|
||95,8 % < 500µm|
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.
|Pictures:||Opened grinding chamber before feeding of sample. For more abrasive materials, also grinding disks made of zirconium oxide or hardmetal tungsten carbide use to be available.|
|Collecting vessel after a grinding of ~ 365 g of sample.|
|Opened grinding chamber after grinding. Sample use to be attached by electrostatic charge to the housing. Those kind of sample can be brushed off easily.|