Efeito da adição de feldspato e/ou resíduo de caulin em formulações à base de argila ilítica
The red pottery industry in Piauí state is well developed and stands out at the national context for the technical quality of its products. The floor and wall tile industry, however, is little developed since the state has only one company that produces red clay-based ceramic tiles. This thesis a...
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| Formaat: | doctoralThesis |
| Taal: | por |
| Gepubliceerd in: |
Universidade Federal do Rio Grande do Norte
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| Online toegang: | https://repositorio.ufrn.br/jspui/handle/123456789/12778 |
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| Samenvatting: | The red pottery industry in Piauí state is well developed and stands out at the
national context for the technical quality of its products. The floor and wall tile
industry, however, is little developed since the state has only one company that
produces red clay-based ceramic tiles. This thesis aims at using the predominantly
illitic basic mass of the above mentioned industry, with the addition of feldspar and/or
kaolin residue in order to obtain products of higher technical quality. Kaolin residue
consists basically of kaolinite, muscovite mica and quartz; the feldspar used was
potassic. In this experiment, basic mass (MB) was used for experimental control and
fifteen 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 were
produced 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 last
one in an industrial oven with a peak of 1140°C, aim ing to confirm the results found
in laboratory and, finally, technological tests were performed: MEA, RL, AA, PA, TRF
and PF. The results revealed that the residue under study can be considered a raw
material with large potential in the industry of red clay-based ceramic tiles, since the
results found both in laboratory and in the industry have shown that the test samples
produced from the formulations with up to 4% feldspar and those produced with up to
8% feldspar and residue permitted a reduction in the water absorption rate and an
increase in the mechanical resistance while those samples produced with up to 4%
residue had an increase in the mechanical resistance when compared to those
produced from the basic mass and that the formulation with 2% feldspar and residue
presented the best technological properties, lowering the sintering temperature down
to 1120°C |
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