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1.3 Brief description of the device
1.3.1 Fields of application
The cross beater mill serves primarily for preliminary and fine comminu-
tion of medium-hard, brittle materials up to Mohs hardness of 6. Thanks
to a large selection of accessories, the cross beater mill
is a device with
wide-ranging fields of application primarily in the areas of chemicals and
ceramics, in mining and metallurgy as well as in the preparation of soil
samples, etc. in the laboratory and in industry.
The achievable final fineness depends on the hole width of the
bottom sieve and the grinding properties of the material to be
ground. Under good conditions, fineness levels < 100 µm can
be achieved.
Typical applications for soft materials:
Needles, leaves, grain, resins, cellulose, chemicals, dried fruits, peat,
seeds, dried plants
Typical applications for medium-hard materials:
Animal feed, salts, pellets, coal, porcelain clay, spices, gypsum, drugs,
potash, tablets, slag, minerals, ash, stone and earth (bauxite, limestone,
dried clay, etc.), synthetic resins, pyrite, cement clinker, coke, ores, re-
fractory materials.
1.3.2 Method of operation
The comminution in the cross beater mill takes place through
impacting, colliding and shearing effects. After introduction into
the filling funnel, the material enters the grinding chamber,
where the comminution process occurs between the cross
beater, grinding insert and bottom sieve.
As soon as the material has reached the corresponding final
fineness, it passes through the bottom sieve into the collecting
vessel.
A back draft of the air flow generated by the rotating cross
beater is prevented and an acceleration of the material
throughput is partially achieved with the use of a textile filter
hose between
the cross beater mill
and the collecting vessel.
This ensures a gentle grinding process.
