New Variable Speed Rotor Mill ?pulverisette 14?
Apr 05 2006 Read 2065 Times
Grinding temperature-sensitive materials is also possible with the variable speed rotor mill. The ex-tremely high rotor speed enables fast and effective grinding, drastically reducing thermal stress on the grinding material.
Samples that are difficult to grind can be ground to analytical fineness by embrittlement (e.g. addition of liquid nitrogen before grinding). Under some cir-cumstances, the high efficiency of the mill can make it possible to grind such samples even with-out previous embrittlement.
The "pulverisette 14" can be fitted with a pin insert in order to grind medium-hard samples and materi-als containing oil or grease without a sieve. By inserting an impact rotor with impact blades in the sieve ring, hard to medium-hard samples can be crushed easily through the increased shearing effect.
With a feed particle size of < 10 mm, a final fine-ness of up to 40 µm can be achieved. The through-put depends on the material and lies between 0.05 and 5 kg per hour.
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