GEOLOGY AND MINERALOGY
SAMPLE PREPARATION FOR ANALYSIS
Ideal for smallest quantities
The PULVERISETTE 7 classic line with 2 working stations is ideally suited for fast, uniform, and extremely fine comminution of very small samples down to colloidal fineness of hard, medium-hard, brittle and moist samples. Depending on the desired final fineness can the grinding be performed dry or in suspension.
Besides for comminution, the Planetary Ball Mill can be utilized for mixing and homogenizing of emulsions and pastes.
|Working principle||impact force|
|Optimal for material type||hard, medium-hard, brittle, moist|
|Number of working stations||2|
|Grinding tools||grinding bowls and grinding balls|
|Materials of the grinding tools||agate, sintered corundum, silicon nitride, zirconium oxide, hardened stainless steel, hardmetal tungsten carbide, polypropylene|
|Grinding bowl sizes||12, 45 ml|
|Grinding ball diameter||0.1 – 15 mm|
|Max. feed size (depends on material)||5 mm|
|Min. sample quantity||0.5 ml|
|Max. sample quantity||40 ml|
|Final fineness (depends on material)||< 1 µm|
|Typical grinding time down to analytical fineness||3 min|
|Grinding in inert gas||only possible in glove box|
|Gas pressure and temperature measurement||no|
|Rotational speed of main disk||100 – 800 rpm|
|Transmission ratio planetary disk / grinding bowl||i relative = 1 : -2|
|Effective diameter of main disk||140 mm|
|Centrifugal acceleration (g = 9.81 m/s²)||50 g|
|Electrical details||100-120/200-240 V/1~, 50-60 Hz, 740 Watt|
voltage, indicated by customer is set
|Emission sound pressure level at the workplace according to DIN EN ISO 3746 (depending on the material to be ground, grinding bowls/balls, selected rotational speed)||up to approx. LpAd = 82 dB|
|Dimensions (W x D x H)||bench top instrument 37 x 53 x 50 cm|
Comminution according to the Planetary Principle
The comminution of the material to be ground takes place primarily through the high-energy impact of grinding balls. To achieve this, the grinding bowl, containing the material to be ground and grinding balls, rotates around its own axis on a main disk whilst rotating rapidly in the opposite direction.
At a certain speed, with this configuration, the centrifugal force causes the ground sample material and grinding balls to separate from the inner wall of the grinding bowl. The grinding balls then cross the bowl at high speed and further grind the sample material by impact against the opposite bowl wall. In addition, impact between the balls themselves on the sample material adds to the size reduction process.
Due to the enormous rotational speed of the main disk – up to 800 rpm – the PULVERISETTE 7 classic line reaches a centrifugal acceleration of up to 50 g.
Particularly high grinding performance – low bench space requirements
The special microprocessor control with up to 99 programmable repetitions of the grinding cycle ensures exceptionally fast, precise, reproducible results. A mill that combines particularly high grinding performance with low bench space requirements!
Configure your Planetary Micro Mill PULVERISETTE 7 classic line exactly to your specific application
The Planetary Micro Mill PULVERISETTE 7 classic line operates with two grinding bowls of sizes 12 ml or 45 ml, which turn with a transmission ratio 1 : -2 relative to the main disk. To achieve best grinding results and for direct prevention of contamination of the samples due to undesired abrasion, grinding bowls and grinding balls are available in 7 different materials.