Retsch SR 300 - Manual (Page 16)

2/8/2012
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Retsch GmbH
16
0002
Instructions for use
Target group: Laboratory personnel
General
The SR 300 is a modern, high-performance product manufactured by
the Retsch GmbH.
A broad selection of accessories makes the SR 300 rotor-beater grind-
ing mill a versatile device suitable for a wide range of applications,
principally in chemicals and pharmaceuticals, in mineralogy and biolo-
gy, etc., and in industrial and research laboratories.
The SR 300 is used primarily for preliminary and final pulverization of
dry, soft to medium-hard materials of up to about 4 on the Mohs
hardness scale.
Ultimate fineness
The ultimate fineness which can be achieved is dependent on the size
of the sieve openings and the fracture characteristics of the pulveriza-
tion product. In favorable cases fineness of < 60 µm can be attained.
Operating principle for the SR 300
Operating schematic
Pulverization in the SR 300 rotor-beater mill is effected by impact, re-
bound and shear action.
Once it has been introduced into the feed hopper, the product passes
into the grinding chamber where the size reduction process takes place
between the rotor-beater, the grinding insert and the sieve. See also
the operating schematic.
Once the product has achieved the appropriate ultimate fineness it
passes through the sieve and into the collection receptacle.
Using a cloth filter bag or a Conidur filter (optional accessory) mount-
ed between the SR 300 and the collection receptacle, the air stream
generated by the rotor-beater as it turns will be deflected and routed
downward toward the material discharge. In addition it will increase the
material throughput rate and ensures that the solids portion in the air
stream will be separated out.