COLLOIDAL GRINDING COLLOIDAL GRI


High Energy Ball Mill Emax


www.retsch.com/emax


Planetary Ball Mill PM 100


www.retsch.com/pm100


Selection of grinding tools: size and material of grinding jar and balls,


grinding balls 3 x larger than biggest particle of the sample


Grinding jar fi lling:


60 % grinding balls, 30 % sample material, addition of dispersant until pasty consistency is obtained


Dispersion media:


e. g. isopropanol, ethanol, mineral turpentine, sodium phosphate, diaminopimelic acid


Grinding process


Cooling down: Particle size analysis


grinding jar should not be opened until it has reached room temperature


Grinding of rocks (granite-like) in the PM 100 Q3


[%]


100 90 80 70 60 50 40 30 20 10 0


0.010 d90


Grinding of alumina in the Emax [%]


Q3 0.9 μm


100 90 80 70 60 50 40 30 20 10 0


0.100 1.000 particle size 10.00 x [μm]


A 50 ml zirconium oxide jar was fi lled with 30 ml zirconium oxide balls of Ø 2 mm. 21 g sample material (which corresponds to one third of the jar volume) and 15 ml water were added and every- thing was mixed, resulting in a pasty consistency. After 2 hours of grinding in the PM 100 at 550 min-1


, the d90 value was 0.9 μm. 0.010 d90


0.1 μm


0.100


1.000 particle size


10.00 x [μm] A 20 percent by weight suspension of alumina in 0.5 % sodium phos-


phate was pulverized in the Emax. The initial material had a fineness of 1.2 μm (d90


110 g grinding balls of Ø 0.1 mm and ground for 30 minutes at 2,000 min-1


. The obtained d90 value was 0.11 μm. ). 30 g of the suspension were mixed in a 50 ml jar with


www.retsch.com | the sample 39 | page 13


percent by volume


percent by volume


Direct contact: 866-473-8724


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