Characterization of Brazilian Northeastern plastic clays
AUTOR(ES)
Laursen, A.
FONTE
Cerâmica
DATA DE PUBLICAÇÃO
14/11/2019
RESUMO
Resumo Argilas plásticas são uma das principais matérias-primas usadas em tecnologia cerâmica. No entanto, há uma escassez dessas argilas no mundo para o uso em tecnologia de porcelanas. O objetivo deste trabalho foi caracterizar argilas plásticas do nordeste brasileiro. Composições química e mineralógica, distribuição do tamanho de partículas, plasticidade e resistência à verde dessas argilas foram determinadas. As argilas analisadas foram constituídas predominantemente por caulinita e quartzo e algumas contiveram esmectita. A quantidade de óxido de ferro nessas argilas foi maior que 1,0% e em algumas alcançou valores superiores a 3%; os limites de liquidez e plasticidade variaram de 22% a 48% e 10% a 32%, respectivamente. De acordo com os dados de caracterização, três argilas plásticas apresentaram potencial para serem usadas como ‘ball clay’ alternativa de acordo com a plasticidade e características mineralógicas.Abstract Plastic clays are one of the main raw materials used in ceramic technology. However, there is a shortage of good quality plastic clays in the world for use in porcelain technology. The aim of this study was to characterize plastic clays from Northeastern Brazil. Chemical and mineralogical composition, particle size distribution, plasticity and green strength of the clays were determined. The analyzed clays were predominantly composed of kaolinite and quartz, and some contained smectite. The amount of iron oxide in the clays was higher than 1.0% and for some of them the values were higher than 3%; the liquid and plastic limits ranged from 22% to 48% and 10% to 32%, respectively. According to characterization data, three plastic clays had potential to be used as alternative ball clay, due to their plasticity and mineralogical characteristics.
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