Sample preparation
Jaw crushers
Jaw crushers are used for coarse grinding of brittle hard samples between a moving and fixed plate. Pieces up to 100mm x 100mm x 100mm can be reduced to a fineness of 1mm. In a disc mill, brittle samples are finely ground between a moving and fixed disc. The disc mill is the typical grinding step after the jaw crusher, and often both mills are coupled in series with each other for a one-step grind from 100mm to 0.1mm. In an oscillating disc mill, samples are crushed between fast-moving reciprocating cylinders. This mill finds its application mainly in the metal industry.
Pulverisette 1 jaw crusher
A jaw crusher is mainly used for initial coarse grinding of brittle and hard materials. Depending on the size of the sample, there is a choice between a Pulverisette 1 – model 1 with a 65mm x 65mm filler hole or a Pulverisette 1 – model 2 with a 90mm x 90mm filler hole.
Depending on the hardness of the sample, grinding plates are available in different materials. For metal-free grinding, plates in zirconium oxide are available.
There is a possibility to combine the jaw crusher with the Pulverisette 13 disc mill. Here, the material falling from the jaw crusher is collected directly between the discs of the disc mill. This makes it possible to grind from a size of 95mm to a fineness of up to 0.1mm in one step. This unique combination guarantees fast and complete grinding in the shortest possible time, resulting in analytical fineness and without any loss of sample.
Pulverisette 13 disc mill
The Pulverisette 13 grinds hard, medium-hard and brittle materials by shearing and friction. 2 discs are used in this process. The material comes between a stationary and a rotating disc that are set to a distance between 12 mm and 0.1 mm. Depending on the product to be ground, grinding discs are available in different materials to avoid metal contamination, among other things.
With a flow rate of up to 150 kg/h, this mill can be used for semi-industrial grinding. A vacuum system is available for removal of the dust fraction or for quick and easy cleaning after grinding. This grinding mill can be used in series with Fritsch jaw crushers to grind materials with dimensions of up to 95 cm x 95 cm to 0.1 mm in one continuous motion.
Pulverisette 13 disc grinder Premium
This machine is the “high tech” version of the Pulverisette 13 classic line. By automatically adjusting the distance between the plates from 0.05 mm to 12 mm, you achieve a very reproducible grind and minimal wear on the grinding plates. This unit can be combined with the jaw crusher Pulverisette 1 premium line to crush materials with dimensions of up to 95 cm x 95 cm to 0.05 mm in one continuous motion.
Pulverisette 9 oscillating disc mill
For very fast grinding of very hard laboratory samples to anaytic fineness, the oscillating disc mill is a good solution. In this mill, grinding is performed by the horizontal oscillating motion of the grinding set on a vibrating plate. The sample is ground by a combination of extremely high pressure, impact and friction.