Caracterização tecnológica da argila plástica de Pântano Grande, RS

Cruz, R. T. da; Bergmann, Carlos Pérez; Bragança, Saulo Roca

doi:10.1590/s0366-69132012000100011

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…For the mixtures containing reference clay and peat clays, the density became higher than the peat samples, around 1.5 g/cm 3 . The values found were consistent with the literature showing higher densities for clays (0.9 to 1.7 g/cm³), lower for organic matter (0.9 to 1.3 g/cm³) and average when mixing both [23,24]. All samples showed a green density ≤1.6 g/cm 3 , indicating low plasticity [6,25].…”

Section: Resultssupporting

confidence: 89%

Ceramic characterization of raw material with a high content of organic matter reduced by composting

et al. 2019

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The process of beneficiation of a peaty ceramic raw material extracted from the Poços de Caldas region, MG, through the composting method to reduce organic matter (OM) was analyzed. The raw materials used in separate piles were divided, keeping one of the samples pure (TP) and adding bovine wastes in the second (TB). The process lasted 6 months and, at the end of each month, the amount of MO was analyzed by the Walkley-Black method. Results of maximum degradation of 56%±6% of OM in the TB and 47%±5% of OM in the TP were obtained. The ceramic characterization of the processed raw material was then carried out. It has been proved that the proposed method is efficient for the decrease of OM in the ceramic raw material. Regarding the composting product, the results were positive, showing that this material can be used in ceramic applications.

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Section: Resultssupporting

confidence: 89%

Ceramic characterization of raw material with a high content of organic matter reduced by composting

et al. 2019

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“…Table III summarizes the loss of mass events. All samples displayed the following peaks in DTA curves: endothermic peak at approximately 110 °C associated to evaporation of free water in the samples; endothermic peak at approximately 580 °C related to dehydroxylation of clay minerals and formation of metakaolinite [12]; and exothermic peak at around 980 °C associated to formation of mullite. The SS clay presented an exothermic band that began at approximately 230 °C associated with the burning of its organic matter.…”

Section: Methodsmentioning

confidence: 99%

“…This extremely worrying scenario is stimulating the search for alternative sources of raw materials to supply the Brazilian industry in coming years. The importance and difficulty in finding high-quality plastic clays that can be used as ball clays have prompted several studies worldwide [8][9][10][12][13][14][15][16][17] aiming at the discovery of new deposits or finding alternative plastic clays that can replace ball clays in their applications. Therefore, the aim of this study is to characterize plastic clays from Northeastern Brazil.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Brazilian Northeastern plastic clays

2019

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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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“…A Figura 9 apresenta o resultado da DSC e TG da argila. Em conformidade com dados encontrados na literatura [13,21] encontra-se um pico endotérmico até cerca de 100 °C referente a perda de água de absorção, há outro pico endotérmico entre 450 e 600 °C característico da reação de desidroxilação da caulinita transformando-se em metacaulinita e um pico exotérmico a partir de 1050 °C que refere-se a formação de mulita. Analisando o gráfico da TG, nota-se que a perda de massa para esta matéria-prima é na faixa de 10%.…”

Section: Análise Térmica Das Matérias-primasunclassified

Estudo dos efeitos da adição de óxido de cálcio nas propriedades cerâmicas, na morfologia e na produção de agregados cerâmicos produzidos à base de resíduo de bauxita

Brito,

Marinho,

Vilhena

et al. 2023

Matéria (Rio J.)

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RESUMO O objetivo deste trabalho foi avaliar a influência da adição do óxido de cálcio na redução da temperatura de sinterização e nas propriedades cerâmicas de agregado sintético à base de resíduo de bauxita. Foram utilizados resíduo de bauxita, óxido de cálcio e argila para a produção de corpos de prova com a adição de 0% e 10% de óxido de cálcio. As propriedades físicas determinadas foram: absorção de água, porosidade aparente e massa específica aparente, e as matérias-primas foram submetidas a ensaios de Difração de raios X (DRX), Calorimetria Exploratória Diferencial (DSC) e Análise Termogravimétrica. A microestrutura das cerâmicas foi avaliada por Microscopia Eletrônica de Varredura (MEV) e DRX, e foi realizado o ensaio de DSC nas formulações compostas por resíduo de bauxita e argila com e sem a adição de óxido de cálcio. Os resultados indicaram que a adição do óxido de cálcio aumentou a porosidade aparente e, por consequência, a absorção de água, enquanto houve também o aumento da massa específica aparente. Quanto à mineralogia, a presença do óxido de cálcio mostrou-se diretamente ligada às alterações das fases minerais, evidenciado principalmente pelo desaparecimento de fases como quartzo e mulita e o surgimento de magnetita.

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Caracterização tecnológica da argila plástica de Pântano Grande, RS

Cited by 4 publications

References 5 publications

Ceramic characterization of raw material with a high content of organic matter reduced by composting

Ceramic characterization of raw material with a high content of organic matter reduced by composting

Characterization of Brazilian Northeastern plastic clays

Estudo dos efeitos da adição de óxido de cálcio nas propriedades cerâmicas, na morfologia e na produção de agregados cerâmicos produzidos à base de resíduo de bauxita

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