Notes on working procedures
Target group
: Laboratory technicians
General
The BB 51 is a robust benchtop machine which can predominantly be
used for preliminary pulverisation of hard or brittle materials.
The performance data, throughput and achievable final fineness are
dependent on the breakage behaviour and hardness of the process ma-
terial, and on the gap width set.
This machine is not designed as a production machine but as a labora-
tory machine intended for 8 hour single shifts with 30% total opera-
tion time.
Do not modify the machine in any way, and use only spare parts and
accessories approved by Retsch.
The conformity with European Directives declared by Retsch
will otherwise be invalidated.
Furthermore, this will lead to all warranty claims being ren-
dered null and void.
Input grain size
The maximum input grain size is determined by the size of the intake
opening, and is max. 35 mm on the BB 51.
Quality of process material
In principle, any hard and brittle process material with a Mohs hard-
ness >3 can be crushed in the BB 51.
Moist or greasy process material with a Mohs hardness <3 tends
merely to compact or cake in the crusher chamber as a result of the
pressure applied by the crusher jaws.
Proper crushing is not possible in such cases.
17.12.1998
©
Retsch GmbH
15
Doc. No. GB 98.056.9999
