Jan 01 2000
The so-called sewage slime regulations state that, before chemical analysis, soil samples must be disagglomerated after drying into a granular size of below 2 mm. Any hard elements such as stone may therefore not be crushed, but must be separated out.
Impact crushing has proved very successful for reducing agglomerates. Equally successful is crushing by friction, where the frictional parts used are relatively soft and flexible. The “pulverisette 8” combines both sorts of crushing: in a cylindrical grinding chamber, circulating spiral plastic brushes throw the samples against the side of the
grinding chamber, the impact achieved thus crushing the agglomerate. At the same time, the bristles sweep the particles along a 2 mm perforated plate, the resulting friction produces further size reduction while the sieve effect of the perforated plate separates the particles by size. The crushed particles are collected in a container underneath the mill. At the end of the grinding line, the uncrushed stones are separated out. The “pulverisette 8” Soil Deagglomerator from Fritsch (Germany) will be particularly useful in institutes for soil research and in agricultural research and investigation organisations. Its fast working procedure makes it particularly advantageous where a large number of samples is involved. Sample preparation – i. e. size reduction of
the agglomerate and separation of stones – is performed in less that one minute. There is no need for cleaning after the completion of each sample preparation, since the “pulverisette 8” cleans itself during operation with its own brushes.
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