Recycling of CRT panel glass as fluxing agent in the porcelain stoneware tile production

In the present work, the feasibility to substitute feldspar raw material in a porcelain stoneware body with Panel Cathode Ray Tube (CRT) glasswas investigated. A standard batch and a composition, where 35 wt.% Na-feldspar was substituted by CRT glass, were sintered at differenttemperatures in the range of 1000–1250 8C. The degree of the densification was studied by evaluation of the closed and total porosity, while thesintering rate was estimated by non-isothermal dilatometric measures. The variation of the crystalline phase composition was evaluated by XRDanalysis. From the preliminary study other ceramic samples with different percentages of CRT glass (i.e. 2.5, 5 and 10 wt.%) were prepared andfired in industrial kiln. The sintering parameters, the microstructure and the mechanical properties were measured and compared with the standardcomposition.