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Previous issue date: 2015-04-17 / Nos estados da Para?ba e Rio Grande do Norte, no Brasil, as jazidas mais expressivas na
produ??o de minerais industriais n?o-met?licos s?o as dos pegmatitos, quartzitos e granitos,
que est?o localizadas na regi?o do Serid?. Os munic?pios de V?rzea - PB, Ouro Branco - RN e
Parelhas - RN s?o os principais respons?veis pela extra??o de argila, quartzo, micas e
feldspato. As empresas de minera??o que atuam na extra??o e beneficiamento dos quartzitos
geram grandes volumes de res?duos, constituindo cerca de 90% de SiO2 na sua composi??o
qu?mica proveniente do quartzo, que ? um dos constituintes b?sicos nas formula??es das
massas cer?micas para a produ??o de revestimento cer?micos. Para tanto, este trabalho avalia
o estudo da adi??o de res?duos de quartzito para obten??o do gr?s porcelanato atrav?s da
caracteriza??o das mat?rias-primas por FRX, DRX, MEV, AG, ATG e DSC, utilizando cinco
formula??es contendo 57% de feldspato, 37% de argila e 6% de res?duos de quartzitos com
colora??es diferentes (branco, dourado, rosa, verde e preto), que foram sinterizadas em tr?s
temperaturas: 1150?C, 1200?C e 1250?C, com isoterma de 1 hora e taxa de aquecimento de
10? C/min. Ap?s a sinteriza??o, os corpos-de-prova foram submetidos a ensaios de
caracteriza??o f?sica como: absor??o de ?gua, retra??o linear, porosidade aparente, massa
espec?fica aparente, resist?ncia ? flex?o em tr?s pontos. Os resultados obtidos apontavam para
a possibilidade da utiliza??o do res?duo de quartzito em um percentual de 6% de adi??o na
massa cer?mica. A utiliza??o de res?duos de quartzito em massa cer?mica proporcionou um
produto final com propriedades tecnol?gicas que atendem ?s normas t?cnicas para a produ??o
de gr?s porcelanato, sendo a temperatura de 1200?Ca que apresentou melhores resultados. De
acordo com os resultados obtidos verificou-se um alto teor de ?xido de ferro no quartzito
preto, sendo descartada a utiliza??o do mesmo em gr?s porcelanato por quest?o estrutural,
pois o material fundiu a 1250?C. Todas as formula??es dos quartzitos obtiveram baixa
absor??o de ?gua quando sinterizadas a 1200?C, obtendo AA entre 0,1% a 0,36% sem terem
passado pelo processo de atomiza??o. Nos ensaios de resist?ncia ? flex?o todos os quartzitos
encontram-se nos limites de aceita??o, segundo a norma europeia EN 100, superando 27 MPa
na sinteriza??o a 1200?C. Com isso, o uso de res?duo de quartzito em massas cer?micas se
apresenta como excelente potencial para a produ??o de gr?s porcelanato. / In States of Para?ba (PB) and Rio Grande do Norte (RN), northeast of Brazil, the most
significant deposits of non-metallic industrial minerals are pegmatites, quartzites and granites,
which are located in Serid? region. Extraction of clay, quartz, micas and feldspars occurs
mainly in the cities of V?rzea (PB), OuroBranco (RN) and Parelhas (RN). Mining companies
working in the extraction and processing of quartzite generate large volumes of waste
containing about 90% SiO2 in their chemical composition coming from quartz that is one of
the basic constituents of ceramic mass for the production of ceramic coating. Therefore, this
work evaluates the utilization of these wastes on fabrication of high-quality ceramic products,
such as porcelain stoneware, in industrial scale. Characterization of raw materials was based
on XRF, XRD, GA, TGA and DSC analysis, on samples composed by 57% of feldspar, 37%
of argil and 6% of quartzite residues, with 5 different colors (white, gold, pink, green and
black). Samples were synthesized in three temperatures, 1150?C, 1200?C and 1250?C, with
one hour isotherm and warming-up tax of 10?C/min. After synthesizing, the specimens were
submit to physical characterization tests of water absorption, linear shrinkage, apparently
porosity, density, flexural strain at three points. The addition of 6% of quartzite residue to
ceramic mass provided a final product with technological properties attending technical norms
for the production of porcelain stoneware; best results were observed at a temperature of
1200?C. According to the results there was a high iron oxide on black quartzite, being their
use in porcelain stoneware discarded by ethic and structural question, because the material
fused at 1250?C. All quartzite formulations had low water absorption when synthesized at
1200?C, getting 0.1% to 0.36% without having gone through the atomization process.
Besides, flexural strain tests overcame 27 MPa reaching the acceptance limits of the European
Directive EN 100, at 1200?C synthesizing. Thus, the use of quartzite residues in ceramic
masses poses as great potential for the production of porcelain stoneware.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20228 |
| Date | 17 April 2015 |
| Creators | Souza, Marcondes Mendes de |
| Contributors | 45327220478, http://lattes.cnpq.br/8698567925323942, Gomes, U?lame Umbelino, 05012180410, http://lattes.cnpq.br/9858094266525225, Silva, Angelus Giuseppe Pereira da, 30814111491, http://lattes.cnpq.br/1435330862718379, Tavares, Elcio Correia de Souza, 49047914449, http://lattes.cnpq.br/4400396552273448, Silva, Gilson Garcia da, 56634161453, http://lattes.cnpq.br/8681275097040450, Costa, Francin? Alves da |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA MEC?NICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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