Mineral powder coating
Ultra-fine grinding of soft, pure minerals
Mineral powder coating - Ultra fine grinding of soft, pure mineralsContraplex pin mills have already successfully proved themselves in practise for the surface coating of finely-ground mineral powders, e.g. limestone and chalk, etc.
Steric acid is frequently used for treating dry material; depending on the mineral and the fineness, the coating rate ranges from 0.5-1.5%.
The Alpine coating system is characterized by special know-how. This applies not only to the entire control and regulating technique, but also especially to the supply of the stearic acid, the spray techniquw in the spray container (5), and the air circulation in closed-circuit operation.
The actual coating process takes place in the Contraplex. The process is very successfully supported by by the "mixing-grinding" effect:
The end product is an optimally surface-coated, disagglomerated material; the granulation is the same as, or finer than, the feed material.
Schematic: Coating systemCapacity Type 630 C: approx. 2 t/h
1 = Feed silo for fine mineral powder;
granulation approx. 10-15 my
1.1 = Magnetic cascade
2 = Feed screw
3 = Supply hopper for stearic acid;
heated to approx. 100-120 degrees C
4 = Feed pump
5 = Stearate spray container with
adjustable special nozzles
6 = Compressed air ducting
7 = Contraplex pin mill
8 = Alpine automatic filter
The fine grinding of mineralsLimestone, chalk, calcite, and marble etc. can be economically ground to high fineness on the Contraplex, providing the composition is as follows:
- Max. Mohs hardness of 3
- High grade of purity with regard to harder, abrasive constituents such as quartz and flintstone, etc. The free amont of these impurities is limited to a maximum of 0.1%
The diagram shows standard values for limestone.
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