Optimum mill for hard and brittle samples

Cross beater mill is suitable for use in mining and agricultural laboratories for the preparation of soil samples

The well-tried milling system of the Pulverisette 16 for dry, medium-hard and brittle samples is still frequently used in mining and agricultural laboratories for the preparation of soil samples.

The comminution in the Pulverisette 16 takes place through impact and shearing effect between the rotating cross beater and the toothed, cast-iron milling chamber.

Dry soil samples containing no large stones can be pre-crushed to a particle size of <10-15mm in a jaw crusher and then ground in the Pulverisette 16 with sieve inserts of 0.5mm or 0.2mm.

Partly composted garden waste with earth and small stones can also be ground finely enough for analysis with a throughput of 100g/min using a stainless steel, 0.2mm bottom sieve.

Since, for this application, there is always sufficient material available, the yield loss of 8 to 10g, in the form of fine dust remaining on the surface of the toothed inner wall of the grinding chamber, can be ignored and does not lead to subsequent errors in the analysis.

The quick-release closure of the grinding chamber makes the mill easy to open and can be quickly and effectively cleaned out with a fine brush and a vacuum cleaner.

In order to avoid cross-contamination, some users grind a part of the next sample as a lost quantity to clean out the Pulverisette 16, eg 100 to 200g can then be discarded.

Fritsch has also received enquiries from customers in the chemical industry for the grinding of tablets or drugs as well as of vegetable samples for biologists investigating cereals, animal feeds or seeds for the presence of plant diseases such as fungal infections or of plant protection products such as fungicides, herbicides, insecticides, acaricides or others.

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