POWDER
AND PARTICLE PROCESSING – Applications – Chemicals
–Calcium carbonate wet and dry –Limestone (dry)
Processing
Calcium Carbonate (CaCo3)
Calcium
carbonate counts among the sedimentary rocks
of natural and organic origin. It is one of the
most important and – in terms of quantity –
frequently used minerals.
It occurs as chalk, limestone and marble. When finely ground, it is used for
a host of different applications.
For example, it is used in the plastics and rubber industries, for pharmaceutical
products and cosmetics, and is also used as a filler in the paper and paint industries.
The
system shown here was designed for the ultrafine
dry processing of calcium carbonate to an end-product
fineness of 97% < 5 µm.
By altering the grinding/classifying parameters,
fineness values to the order of d97 = 3 to 45 µm
can be achieved.
For medium fineness values ranging between 25 µm
and 63 µm, the use of our AWM table roller
mill in combination with the Turboplex ultrafine
classifier is recommended. A system example can
be found under the application: Processing
Talc.
Legend
1 =
Feed bin
2 =
Weighbelt
feeder
3 =
Change-over
flap (sampling)
4 =
Ball mill
S.O.
5 =
Load cells
6 =
Turboplex
ultrafine classifier ATP
7 =
Rotary valve
8 =
Automatic
reverse-jet filter
9 =
Flap valve
10 =
Butterfly
valve
11 =
Fan with
outlet silencer
12 =
End-product
bin with activated discharge
and shut-off device
13 =
Control
cabinet
A =
Feed product
B =
End product
The above-described processing system can be
controlled by means of the Alpine PLEX-CONTROL
system.
This process automation system consists of 4 modules:
- PlexWire control cabinet
- PlexLogic control program
- PlexView process visualisation
- PlexConnect teleservice
Dependent on the desired degree of automation,
these modules are combined with each other.
For further details, see our special brochure
"Alpine Process Automation".
To
expand on the subject, please refer
within this website to "
wet processing of limestone" as
employed for the manufacture of paper fillers.
Interesting
in this respect is the Alpine coating process described
within this website, which deals with the surface
treatment of minerals
with liquid stearin.
For
ultrafine paper fillers, dry processing with our
ATR agitated ball mill combined with a downstream
Turboplex ultrafine classifier is an interesting
alternative. With this machine combination, an end-product
fineness of approx. 90% < 2 µm can be achieved
in one single pass.
Legende
1 =
Feed bin
2 =
Dosing
screw
3 =
Sieving
machine
4 =
Bucket
elevator
5 =
Agitated ball mill ATR
6 =
Turboplex
classifier ATP
7 =
Rotary valve
8 =
Autom.
reverse-jet filter
9 =
Butterfly
valve
10 =
Conveying
screw
11 =
Weighing
bin
12 =
Supply
bin and temporary storage for grinding
pearls
