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Silica gel (desiccant beats)

Protocol number:	M0098362-1
Industry:	Chemistry
Feed Size:	2-5 mm
Desired Fineness:	d50 < 25 µm
Quantity:	200 g
Recommendation:	For a grinding of higher amounts, we recommend using the Planetary Mill PULVERISETTE 5 classic line with maximum 4 bowl fasteners.

Result 1

	Planetary Mill PULVERISETTE 5 classic line with 4 grinding bowl fasteners main disk speed: 360 rpm
Equipment:	500 ml grinding bowl made of zirconium oxide (ZrO2)< + 25x 20 mm Ø ZrO2 grinding balls
Feed quantity:	130 g
Feed Size:	2-5 mm
Additive:	+ water 100ml
Grinding time:	10 min
Final fineness:	73.24% < 25 µm
Comments:	Because fine ground sample use to rise in volume, not more than 130 g of sample should be ground per 500ml bowl. With up to 4 bowl fasteners, up to 500g can be ground per batch. To avoid over pressure, 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. After 5 minutes of grinding, about 54% of sample has been ground to < 25 µm. After 10 minutes of grinding, already ~ 73 % of sample use to be < 25 µm. For a better fineness, we might recommend changing ball diameter to e.g. 2mm Ø and proceed grinding.