Compared with limestone, talc is a specialty within the filler market. Because there are numerous types of talc that vary widely dependent on the individual deposit, both the processing and the application of this raw material are extremely diverse.
Talc has the following features:
– Plate-like, laminar structure
– Low hardness value
– Insoluble in water
– High degree of whiteness
– Chemical stability
Thanks to these properties, talc is mainly used in the following two application areas:
As a coating pigment and to permit pitch control
As a filler for polypropylene, to increase the rigidity and the dimensional stability special applications can be found in the cosmetics, pharmaceutical and ceramic industries.
There are two things, which require special attention when processing talc: the high abrasiveness of the contaminants (quartz, dolomite, etc.) in the otherwise soft talc, as well as preservation of the laminar structure. Because of this, we mainly employ the AWM table roller mill, AFG fluidized bed opposed jet mill or the Zirkoplex classifier mill ZPS for grinding talc.
Hosokawa/Alpine fluidized bed opposed jet mill AFG has become a standard the world over for ultrafine grinding. Employment of a multi-wheel classifier in the AFG jet mill allows high fineness values at high throughput rates to be achieved. This is the reason why our large jet mills (800/3 AFG and 1250/6 AFG) are in use by all market leaders on the talc sector. The new 1500/3 AFG – the world’s largest jet mill – has made it possible to significantly extend the throughput. All machines are equipped with patented mega-jet nozzles and operate with hot compressed air to boost performance.