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Pulverizing of Cacao with the Universal Mill,
type PX
Pulverizing of Cacao with
an Air Cooled Grinding System
Powders for instant
chocolate drinks can be produced from pre-crushed cacao
press cake using an Universal mill type PX 315. The
cacao press cake usually has a fat content of approx. 12
percent and gets pre-crushed into pieces having a size
of approx. 12 mm and smaller (1/2 inch). The material is
very heat sensitive and thus for pulverizing a system
using chilled air is needed. The system can produce a
cacao powder with a particle size 90 percent minus 74 µm
(200 mesh). The throughput capacity is approx. 200 kg/h.
Method of Operation
Material is metered into the Universal mill by
means of a vibratory feeder. Process air, going
into the mill and used for air conveying of the
material, is chilled in a heat exchanger using
cold water. Size reduction of the material takes
place inside the grinding chamber by impact of
the material against the pins of a rotating and
a stationary pin disc.
Pulverized material is discharged into a pick-up
pan and air conveyed into a cyclone separator.
Material and air are separated in the cyclone.
Fine powder is discharged through a rotary
airlock installed at the outlet of the cyclone.
The air from the cyclone separator passes
through a filter. Super fine material is
discharged through the rotary airlock underneath
the filter. The whole system is operated under
negative pressure created by a blower; this
ensures a clean operation of the system. Air is
circulated, cooled in the heat exchanger and
then used in the process again. |
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Closed loop pulverizing system
with Universal mill, cyclone, filter and heat
exchanger. |
Advantages & Features
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Chilled
air allows heat sensitive materials
to be pulverized |
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Closed loop system provides dry
grinding conditions |
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Good access to the grinding chamber
for easy cleaning |
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Pipes supplied with fast disconnects
for easy cleaning |
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Rotary airlocks in "quick clean
design" with pull-out rotor
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Pick-up pan with cleanout door
provides good access for cleaning |
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Electric panel to control all system
functions |
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Safety switches for maximum operator
protection |
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Casted design, rugged and reliable
in operation |
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Compact space saving design |
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1 Feed hopper
2 Vibratory feeder
3 Infeed chute
4 Universal mill |
5 Main drive motor
6 Drive guard
7 Pick-up pan
8 Machine stand |
Technical Specifications
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Type |
PX |
250 |
315 |
500 |
630 |
1000 |
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Scale up Factor |
f |
0.5 |
1.0 |
2.4 |
4.0 |
8.6 |
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Rotor Diameter |
mm |
250 |
315 |
500 |
630 |
1000 |
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Rotor Speed, max |
rpm |
8800 |
7000 |
4600 |
3500 |
2300 |
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Rotor Speed,min |
rpm |
6250 |
5000 |
3280 |
2470 |
1550 |
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Motor |
kW |
5.5-11 |
11-18.5 |
30-45 |
55-75 |
110-160 |
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Throughput rate * |
kg/h |
50-250 |
100-500 |
250-1200 |
400-2000 |
800-4300 |
* Throughput Rate
may vary depending of the feed material |
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