Operating the machine
26
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5.5.2
Wet grinding
•
Before adding sample, ensure that the grinding bodies are in a structured
order (6 rows of 8).
•
Place the crushed and sieved sample in the centre of the top layer of
grinding bodies. Take care that no sample particles fall onto and remain on
the top rim of the grinding jar.
•
For wet grinding, pour approx. 7 ml of liquid (water) over the sample. Ensure
that all sample particles are rinsed into the grinding jar.
•
Screw the lid onto the grinding jar. Make sure that the lid closes tightly so
that no liquid can escape.
Fig. 13: Pouring lid
-
The twin hole pouring lid is used to prevent the grinding bodies falling out
when the product slurry in the mill is poured out at the end of a grinding
process.
•
After the grinding cycle has finished, remove the grinding jar by reversing the
order of operations used for clamping
•
Remove the grey lid and replace with the twin hole pouring lid (DK). Pour the
contents of the grinding jar into a glass beaker or bowl.
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5.5.3
Dry grinding
•
Shake the grinding jar gently to ensure that the sample falls into the grinding
jar and is not left at the top of the grinding bodies.
•
Screw the lid to close it, insert the grinding jar in the mill as described above
and start the grinding process for the required length of time.
•
When grinding has been completed, remove the grinding jar in reverse order
as described above (see figures).
•
Remove the grinding jar lid.
•
To remove the sample from the grinding jar, the grinding bodies must be
taken out of the grinding jar for cleaning. Various methods are
recommended here, e.g. use of tweezers to remove the grinding bodies
individually or tipping the grinding bodies out and catching the ground
sample from the grinding jar using a sieve with a diameter of 200 mm and
suitable mesh size placed on a suitable material (paper or rubber with shiny
surface). After cleaning the jar and the grinding bodies, the grinding bodies
must be placed back in the grinding jar using the supplied applicator.
DK
