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Bentonite is a valuable clay formed
by the weathering of volcanic ash.
It possesses swelling
properties, can undergo ion exchange, and can
become temporarily
liquid under the influence of mechanical forces (thixotropic
properties).
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table roller mill AWM |
In its processed state, bentonite
is used in many different branches of industry as well
as in the field of agriculture. A few examples:
a) Building industry:
- as a sealant
- as a flushing agent and antiseize agent
- in special cements, etc.
b) Pharmaceuticals industry:
- as an additive for liniments, pastes and powders
- to bind poisons
- for cosmetic products, etc.
c) Foodstuffs industry:
- as a food supplement (e.g. E 558)
- as a carrier medium for colours
- to clarify fruit juices and wines, etc.
d) Ceramics industry:
- as a flow agent for ceramic compounds
- as an additive for glazes and enamel suspensions
- as a binder for moulding sand, etc.
e) Paper industry:
- as an adsorption agent and for separating undesirable
products from the treatment water
- for special types of papers
- as an additive for processing waste paper, etc.
f) Agriculture:
- as a soil improver
- in fertiliser additives
- as an adsorbent for stables, etc. |
For the above-mentioned applications, bentonite fineness values
of between 97% < 63 µm and 97% < 20 µm are
demanded.
The system schematic shows a system that fulfils the aforementioned
requirements. The bentonite in this case has a high feed moisture
of more than 15% H2O.
To enable trouble-free processing, the product needs to be dried
down to less than 0.5% H2O.
Our table roller mill AWM provides the possibility of drying
the product at the same time as grinding and classifying it.
To this end, the heated flow of air that is generated during
processing is utilised. This is accomplished at a low energy
consumption, because the heat generated by the mill, classifier
and fan is used. This process makes it possible to save up to
25% of the normally required drying energy.
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1 = Feed bin
2 = Feed metering unit
3 = Rotary valve
4 = Table roller mill AWM with MS classifier
5 = Automatic reverse jet filter
6 = Fan
7 = Feed screw
8 = Heat exchanger
9 = Rinsing air fan
10 = Hydraulic unit
11 = Lube oil supply
12 = Packing machine
13 = Control cabinet
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