The influence of carbonates on the technological properties of an industrial porcelain type body

ISSN 1121-7588
C. Dagounaki*, C. Sikalidis**, A. Kassoli-Fournaraki*, A. Tsirambides*
*School of Geology, Aristotle University of Thessaloniki, Thessaloniki, Greece
**School of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece


The mineralogical composition and technological characteristics of an industrial porcelain type body mixed with 3 wt.%, 6 wt.%, 9 wt.%, 12 wt.% and 15 wt.% of carbonates respectively have been studied. The added components were two samples from limestones and dolomites from carbonate formations of Kozani area, northwestern Macedonia, Greece and one magnesite from Gerakini formation of Chalkidiki peninsula, northern Greece. After firing the prepared ceramic specimens at 1200 °C for half an hour, the addition up to 9 wt.% of magnesite, up to 6 wt.% of dolomite and 3 wt.% of limestone gave better values of shrinkage, porosity and water absorption compared to the reference porcelain type body. The addition of carbonates lowers in general the compressive strength of the fired specimens. No correlation of the amorphous phase and the technological properties was found. Limestone addition favoured the formation of feldspars, dolomite the formation of feldspars, cordierite and forsterite and magnesite the formation of cordierite and forsterite.
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