Allgaier drum dryer system TRH: Innovative combination
Effizientere Aufbereitung von Kalkstein-Siebschutt: Trocknen und Reinigen in einem Schritt During the extraction of limestone in quarries, so-called pre-screening debris are yielded. Up to 90 % of this pre-screened material consists of good limestone rock, which is frequently heavily interstratified with clay and loam impurities. Therefore, it could only be sold as a low-grade product without being cleaned correspondingly.
Usually wet washing processes are used, e.g. rock washing plants known from sand and gravel processing, to remove the pollutants adherent to the limestone. Then the washed materials have to be dried before further processing (crushing, screening, classifying, burning). The use of rock washing plants requires an expensive sewage and sludge treatment and, only for this reason, cannot be used unproblematically everywhere. The required capital spending and power for such plants, above all combined with drying, is considerable, also because the washing of the rock leads to the a higher water content exceeding the original rock moisture. It would