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Abrasives
belong to a group of materials that are at the very end
of the Mohs' hardness scale. Examples of such products
are emery, corundum, silicon carbide, boron carbide, and
diamonds, etc.
Hosokawa Alpine has a range of processing systems that
are tailored to the manufacture of grain sizes that meet
international abrasives standards and also to the production
of polishing compounds for the optical industry. These
systems are designed for the contamination-free or low-contamination
dry grinding and classifying with subsequent safety sieving
of the abrasives and polishing compounds.
Below is a schematic showing a system designed to simultaneously
produce five different grain sizes of silicon carbide
in accordance with the P series (P 800, P 600,
P 320, P 240 and grain size 150).
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Example: Production of granulations
in the P series:
AFG = Fluidised bed opposed jet mill; ATP = Turboplex ultrafine
classifier; LS = Air jet sieve; FG = Fines; GG = Coarse
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Grinding system
1 = Flap valve
2 = Fluidised bed opposed jet mill AFG
3 = Cyclone
4 = Flap valve
5 = Autom. Filter
6 = Flap valve
7 = Fan
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Classifying system
1 = Flap valve
2 = Turboplex classifier ATP
3 = Flap valve
4 = Cyclone
5 = Flap valve
6 = Autom. filter
7 = Flap valve
8 = Fan
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Safety sieving system
1 = Feed metering screw
2 = Sieving machine |
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Central control and switch unit |
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| The above-illustrated grinding,
classifying and sieving system is necessary to permit
production of a specific granulation. If different granulations
are to be manufactured, they can be produced after cleaning
the classifier and sieving machine and assuming suitable
classifier settings and choice of sieve. If different
granulations are to be produced simultaneously, a mill
with suitable downstream classifiers and sieving machines
is necessary (see schematic on previous page). |
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