Efeito da adição de resíduos de caulim e quartzito em massas cerâmicas para revestimento
The raw materials used in the production of ceramic materials are limited and in many cases non-reusable natural resources such as quartz, clays, feldspars, phyllites and kaolin. However, given the world demand for ceramic materials and, on the other hand, the concern with the impact caused by th...
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| Formato: | doctoralThesis |
| Idioma: | pt_BR |
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/27741 |
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| Resumo: | The raw materials used in the production of ceramic materials are limited and in many
cases non-reusable natural resources such as quartz, clays, feldspars, phyllites and kaolin.
However, given the world demand for ceramic materials and, on the other hand, the
concern with the impact caused by the mineral exploration and the scarcity of raw material;
the use of mineral waste for the production of coatings as a substitute for conventional raw
materials is an option that has been studied and in some cases considered viable. In this
work, the effect of the addition of kaolin and pink quartzite residues, which come from the
microregions of Seridó Potiguar and Borborema Paraibana, in the ceramic materials for
coating production, are investigated. For this, eight ceramic masses with 10, 17, 20, 27,
30, 37, 40 and 47% of kaolin residue and 6% of pink quartzite residue and 37% of clay
were prepared. Such residues were used in substitution of quartz and kaolin commonly
used in ceramics for coating. The raw materials used were characterized as chemical
composition, through XRD and FRX; and thermal behavior (TG, DTG, dilatometry); besides
particle size analysis. In the case of clay, its plasticity index (PI) was analyzed. The
specimens were compacted at a uniaxial pressure of 21 MPa in a steel matrix with
dimensions of 60 x 20 x 2 mm. Then they were oven dried at 100°C for 24h and sintered
at 1200°C, 1250°C and 1300°C under atmospheric air, with a heating rate of 10°C / min
and a 60 minute isotherm. The characterization of the test specimens was carried out
through the technological tests of water absorption (AA%), linear retraction (RL%),
apparent porosity (PA%), fire loss (PF%), apparent specific mass (MEA) modulus of
flexural strength (MRF), optical microscopy (MO) and scanning electron (SEM). According
to the standards NBR 13818 and 13817, the results of water absorption (AA%) and flexural
strength (MRF) tests showed that the ceramic masses produced with the addition of
mineral residues can be used in wide applications. In relation to the water absorption
(AA%), at the temperature of 1200°C, the specimens produced have characteristics similar
to semiporous, semi-precious and stoneware type coatings. At the temperature of 1250°C,
the samples presented technological properties similar to the semigrés, stoneware and
porcelain tiles; while at 1300°C porcelain and stoneware. The values of the flexural
strength test (MRF), on the other hand, showed that the specimens produced with the
ceramic masses are similar to the semigrass, semiporous and porous type. |
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