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zirconium hydroxide

Protocol number:	M0097311
Industry:	Chemistry, Ceramics / glass industry
Feed Size:	5 mm
Desired Fineness:	87% < 180 µm
Quantity:	~ 35 g
Recommendation:	We recommend grinding the sample with Mortar Grinder PULVERISETTE 2 until a sticking of sample occurs. To improve the dry grinding result, it is possible to separate fine ground and sticking particles and proceed grinding the coarse fraction.

Result 1

	Mortar Grinder PULVERISETTE 2 downforce: 5 daN (low pressure)
Equipment:	mortar and pestle made of zirconium oxide (ZrO2)
Feed quantity:	36,5 g
Feed Size:	5 mm
Grinding time:	3 min
Final fineness:	sticks - 87% < 180 µm
Comments:	After a grinding time of 3 minutes, sample already starts to become compressed by the pestle because of sticking of particles. This use to happen when a fineness of d50 < 30 µm might be present; some hygroscopic samples tend to stick faster. We determined a fineness of 87 % < 180 µm as desired. Because it is not allowed by the customer to proceed grinding in suspension, the grinding result can only be improved by separation of sticking, fine ground particles by sieving or sifting and proceed grinding the coarse particles.