The red pottery industry in Piauí state is well developed and stands out at thenational context for the technical quality of its products. The floor and wall tileindustry, however, is little developed since the state has only one company thatproduces red clay-based ceramic tiles. This thesis aims at using the predominantlyillitic basic mass of the above mentioned industry, with the addition of feldspar and/orkaolin residue in order to obtain products of higher technical quality. Kaolin residueconsists basically of kaolinite, muscovite mica and quartz; the feldspar used waspotassic. In this experiment, basic mass (MB) was used for experimental control andfifteen formulations codified as follows: F2, F4, F8, F16, F32, FR2, FR4, FR8, FR16,FR32, R2, R4, R8, R16 and R32. All raw materials were dry-milled, classified,formulated and then humidified to 10% water. Thereafter, test samples wereproduced by unixial pressing process in a rectangular steel matrix (60.0 x 20.0 x 5.0)mm3 at (25 MPa). They were fired at four temperatures: 1080°C, 1120°C, 1160°C,with a heating rate of 10°C/min during up to 10 min in an electric oven, and the lastone in an industrial oven with a peak of 1140°C, aim ing to confirm the results foundin laboratory and, finally, technological tests were performed: MEA, RL, AA, PA, TRFand PF. The results revealed that the residue under study can be considered a rawmaterial with large potential in the industry of red clay-based ceramic tiles, since theresults found both in laboratory and in the industry have shown that the test samplesproduced from the formulations with up to 4% feldspar and those produced with up to8% feldspar and residue permitted a reduction in the water absorption rate and anincrease in the mechanical resistance while those samples produced with up to 4%residue had an increase in the mechanical resistance when compared to thoseproduced from the basic mass and that the formulation with 2% feldspar and residuepresented the best technological properties, lowering the sintering temperature downto 1120°C
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