Preparation of mullite based ceramics from clay–kaolin waste mixtures

Alves, Hugo P.A.; Silva, Jaquelígia Brito da; Campos, Lizsandra Fernanda Araújo; Torres, Sandro Marden; Dutra, Ricardo Peixoto Suassuna; Macedo, Daniel A.

doi:10.1016/j.ceramint.2016.09.068

Cited by 61 publications

(36 citation statements)

References 22 publications

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“…A ceramic formulation containing a kaolinite clay and kaolin waste (25 wt% waste) was used to obtain a mullite/glass composite by solid-state reactive sintering. Mineralogical characterization of the raw materials (both from State of Paraíba, Brazil) is given elsewhere [16]. X-ray fluorescence spectroscopy (Shimadzu, EDX-700) was used to determine the chemical composition.…”

Section: Methodsmentioning

confidence: 99%

“…Apart from conventional uses in the refractory industry, mullite and mullite-based ceramic composites have gained interest in the electronics industry as materials for high-frequency circuit packaging and electronic substrate application due to their low values of dielectric constant and dielectric loss [14,15]. We have already reported the preparation of almost pure mullite as a crystalline material by firing a mixture of kaolinite clay and 25 wt% mica-rich kaolin waste at 1300-1500 °C [16,17]. Following our own experience with these materials, we selected a kaolin waste processed ceramic fired at 1400 °C to evaluate its dielectric and electrical properties aiming to attain a potential low-cost material for electronicsrelated applications.…”

Section: Introductionmentioning

confidence: 99%

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Dielectric and electrical properties of a mullite/glass composite from a kaolinite clay/mica-rich kaolin waste mixture

et al. 2019

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A mullite/glass composite has been prepared by reactive sintering of a kaolinite clay/mica-rich kaolin waste mixture with 25 wt% waste. Phase composition, microstructure, dielectric and electrical properties of the composite fired at 1400 °C were evaluated by X-ray diffraction, scanning electron microscopy and impedance spectroscopy (between 25 and 600 °C in air). The microstructural characterization showed the attainment of dense samples composed of acicular (orthorhombic) mullite (47.6 wt%), glassy phase (50.1 wt%), and residual quartz (2.3 wt%). Electrical conductivity (1.9x10 -8 S/cm at 300 °C), dielectric constant (6.7 at 1 MHz, 25 °C) and dielectric loss (0.024 at 1 MHz, 25 °C) results gave evidence that the mullite/glass composite is a promising low-cost material for commercial use in electronics-related applications.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dielectric and electrical properties of a mullite/glass composite from a kaolinite clay/mica-rich kaolin waste mixture

et al. 2019

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“…Crystalline phases in the kaolinite clay ( Fig. 2a Kaolinite is a layered aluminosilicate (1:1) which exhibits a wide range of sintering temperature and quartz can increase the mechanical strength [14]. The chemical composition of the starting materials (expressed as a percentage of the oxides) is presented in Table I.…”

Section: Resultsmentioning

confidence: 99%

Preparation of low-cost ceramic membranes for microfiltration using sugarcane bagasse ash as a pore-forming agent

et al. 2019

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Ceramic membranes are of great industrial interest in separation processes. They are characterized by high chemical and thermal stabilities and filtration capacity at high temperatures (>500 °C) in a wide range of pH values. However, the major disadvantage of ceramic membranes is the high-cost of production involving synthetic raw materials, usually alumina and zirconia. In this work, low-cost ceramic membranes were prepared by solid-state reactive firing using a mixture of kaolinite clay and sugarcane bagasse ash. Particle size distribution, thermal, mineralogical, and chemical composition analyses were carried out to study the raw materials. Technological properties and water permeability were investigated in samples fired between 800 and 1000 °C. The filtration efficiency was measured by comparative analyses between the raw water and the filtrate. The mean pore size ranging from 2.5 to 6.0 μm makes the sugarcane bagasse ash derived ceramic membranes suitable for microfiltration processes.

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“…Kaolin is an important raw material employed in ceramic manufacture; some kaolinite clay types have been used to prepare ceramics based on mullite because it has high-stability temperature, high refractoriness, high resistance to corrosive agents, and other desirable properties [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…e mineralogical compositions of clays are important aspects to evaluate since they directly influence the physical and mechanical qualities of fabricated ceramic products [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Chemical, Mineralogical, and Refractory Characterization of Kaolin in the Regions of Huayacocotla‐Alumbres, Mexico

Romero-Guerrero

Moreno-Tovar

Arenas-Flores

et al. 2018

Advances in Materials Science and Engineering

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In the present work, the chemical, mineralogical, refractory, and microstructural characterizations of kaolinites from the Huayacocotla-Alumbres region, which is between Veracruz and Hidalgo border, by X-ray diffraction (XRD), polarization optical microscopy (POM), scanning electron microscopy (SEM), refractoriness proof (pyrometric cone equivalent), and thermogravimetric analysis (TGA) were carried out. The analysis by POM showed that the kaolinization degree in this region is variable due to the presence of primary minerals, such as plagioclase, feldspar, and quartz. Additionally, hydrothermal alteration of the epithermal type was determined by oxidation of sulfides (pyrite and galena) and chlorite association. With the X-ray diffraction technique, andalusite and kaolinite were identified as the majority phases in Huayacocotla and quartz was identified as the majority phase in Alumbres. The minority phases, such as dickite, kaolinite, and cristobalite, were observed in both zones. The SEM technique was useful in the determination of the morphology of kaolinite and impurities of Na, Mg, K, and Fe of the complex clay illite-andalusite-dickite group. Thermogravimetric analysis was useful to discover the decomposition temperature and reveal the significant difference between 400 and 800°C, which showcases the greatest mass loss due to dehydration and carbonates decomposition. The mullite phase was detected at approximately 1000°C in the kaolin samples. The refractoriness tests were important to determine the stability temperature of kaolin, which is between 1300 and 1600°C. This stability temperature makes it feasible to use the kaolin as a refractory material for both low and high temperatures. The variables that affect the kaolin stability temperature were determined by principal components with the XLSTAT free program.

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Preparation of mullite based ceramics from clay–kaolin waste mixtures

Cited by 61 publications

References 22 publications

Dielectric and electrical properties of a mullite/glass composite from a kaolinite clay/mica-rich kaolin waste mixture

Dielectric and electrical properties of a mullite/glass composite from a kaolinite clay/mica-rich kaolin waste mixture

Preparation of low-cost ceramic membranes for microfiltration using sugarcane bagasse ash as a pore-forming agent

Chemical, Mineralogical, and Refractory Characterization of Kaolin in the Regions of Huayacocotla‐Alumbres, Mexico

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