Coal seam material

Given sample of ~ 30mm thickness has been pre crushed with our Jaw Crusher PULVERISETTE 1.

All sample has been ground to ~ 8mm length within 15 seconds.

Jaws use to remain free of residue; even higher amounts can be ground without problems.

For a 80ml grinding bowl, we recommend filling minimum 10ml of sample. For this, we have taken 5g of coal seam material for grinding.

20ml of water has been added to prepare motor oil like viscosity for best grinding results.

To avoid overpressure, we ground the sample in steps of 5 minutes, followed by a programmed pausing time of 10 minutes. After several cycles, the outside temperature of the bowl should be checked (remain below 80°C); grinding time or programmed pausing time might be readjusted afterwards.

This is also counting for the following grinding trial(s) too.

After 30 minutes of grinding time, a d50 < 4,8µm has been achieved (see meas. no. 3274 on separate page, meas. with Laser Particle Sizer ANALYSETTE 22 NanoTec).

Also a Planetary Micro Mill PULVERISETTE 7 classic line might be cable reaching the desired endfineness (see result 3).

For a 45ml grinding bowl, we recommend using minimum 3ml of sample. For this, 4g of coal seam material have been used.

15ml of water has been added to prepare motor oil like viscosity for best grinding results.

After 25 minutes of grinding, fineness has been checked with our Laser Particle Sizer ANALYSETTE 22 NanoTec. A d50 < 4µm has been detected (see Meas. no. 3261 on separate page).