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(Aluminium powder and grits, bronze
powder and magnesium powder, etc.)
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Aluminium powder consists of ultrafine
lamina or flakes of aluminium. It is manufactured by processing
(grinding/classifying) foil scraps. The fineness is usually
between 1 µm and 100 µm, whereby
the particles are between 0.13 µm and 1.3 µm
thick.
Aluminium grits are formed by atomising
aluminium. The fineness after processing is between approx.
10 µm and 1 mm.
Aluminium powder and grits are used in the chemicals industry
for paints and varnishes, in the building industry, e.g.
for foam mortar bricks, and are processed to explosives
and fireworks in the pyrotechnical industry. |
Turboplex Ultrafine Classifier ATP
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Bronze is an alloy comprising approx.
80 – 90% copper and 10 – 20% tin. It is turned
into powder by means of atomisation or grinding with special
ball mills, and is used today for a number of different
applications. For example, paint manufacture, textile
and paper coating, the chemical-technical industry –
which produces special composite materials for friction
linings and clutch pads – as well as many other
applications. Dependent on the application, fineness values
in the range of 99.9% < 4 µm are demanded.
Magnesium powder is finely processed
light metal. It has a relatively low melting and boiling
point and reacts in the same way as aluminium powder to
any contact with oxygen in that it produces an intense
white flame. Magnesium powder is used in the chemicals
industry, in pyrotechnics and metallurgy, etc. The demanded
fineness values are in the range < 63 µm
with a low fines portion. |
The process schematic below
shows a classifying system for separating the ultrafine
portion (99.9% < 10 µm) from aluminium
and magnesium powder.
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1 = Feed metering unit
2 = Flap valve
3 = Turboplex Ultrafine Classifier ATP
4 = Heat exchanger
5 = Fan
6 = Automatic reverse jet filter
7 = Control cabinet
A = Feed product
B = End product
C = Ultrafine portion
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| Because the above powders are potentially
explosive (exception: bronze powder), special safety measures
must be taken. The systems are therefore operated in N2
circuit-gas mode or are in pressure-shock-proof design. |
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