Recycling of waste fly ash for production of porous mullite ceramic membrane supports with increased porosity

Cao, Jingjie; Dong, Xinfa; Li, Lingling; Dong, Yingchao; Hampshire, Stuart

doi:10.1016/j.jeurceramsoc.2014.04.011

Cited by 170 publications

(83 citation statements)

References 38 publications

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“…Na Tabela V estão apresentados os dados da composição química das massas cerâmicas formuladas. Observou-se que a quantidade de óxido de silício (SiO 2 ) foi de 45 Tabela IV -Frações granulométricas (%) por tamanho de partículas das formulações.…”

Section: Caracterização Das Massas Cerâmicasunclassified

“…De acordo com o exposto, considerou-se que o material em estudo foi nanométrico devido ao diâmetro das agulhas ser menor do que 100 nm. As formas, dimensões e razões de aspecto estão alinhadas com as reportadas na literatura [45]. Na Tabela VIII estão contidos os valores médios de absorção de água em função da temperatura e do tempo de maturação para as formulações F1 e F2.…”

Section: Caracterização Das Amostras Tratadas Termicamenteunclassified

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Influência da composição e das variáveis de processamento deformulações à base de argilas - uso em materiais refratários

Figueiredo¹,

Fernandes²,

Silva³

et al. 2018

Cerâmica

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ResumoAs argilas são componentes fundamentais das massas para produção de materiais cerâmicos tradicionais, pois garantem plasticidade na etapa de conformação e resistência mecânica após a queima; também podem ser utilizadas nas formulações de cerâmicas refratárias devido ao desenvolvimento da fase mulita em temperaturas elevadas. O objetivo deste trabalho foi avaliar o efeito da composição, tempo de maturação e temperatura de queima em formulações à base de argilas para uso na fabricação de materiais refratários. As argilas foram caracterizadas por análise granulométrica, análise química, refratariedade, difração de raios X, análise térmica diferencial e termogravimétrica. As formulações contendo caulim mais ball clay e caulim mais esmectita foram submetidas à maturação por um período de 1 a 4 semanas. Em seguida, as massas foram conformadas por prensagem uniaxial obtendo-se corpos de prova, que foram submetidos a tratamento térmico em 1200, 1300 e 1400 °C, e, posteriormente, analisados quanto às propriedades: absorção de água, retração linear de queima e resistência à flexão em três pontos. Os resultados obtidos evidenciaram que as formulações em estudo apresentaram após queima fases de quartzo, cristobalita e mulita como fase majoritária. A temperatura de queima foi o parâmetro que apresentou maior influência nas propriedades avaliadas, com maior efeito da temperatura mais alta (1400 °C). Palavras-chave: argilas, composição, refratário. AbstractClays are key components of mass for traditional ceramic materials production because they ensure plasticity in the shaping step and mechanical resistance after firing. They can also be used in refractory ceramic formulations due to the development of mullite phase at high temperatures. The objective of this study was to evaluate the effect of composition, maturation time, and firing temperature on clay formulations for use in manufacturing refractory materials. The clays were characterized by particle size analysis, chemical analysis, refractoriness, X-ray diffraction, as well as differential thermal and thermogravimetric analyses. Formulations containing kaolin with ball clay and kaolin with smectite were submitted to a maturation period of 1 to 4 weeks. Next, the masses were shaped by uniaxial pressing to obtain test specimens, which were then subjected to heat treatment at 1200, 1300 and 1400 °C, and the following properties were subsequently analyzed: water absorption, linear firing shrinkage, and three-point flexural strength. The results showed that after firing the samples had quartz, cristobalite and mullite phases, with the latter as the major phase. The firing temperature was the parameter that had the greatest influence on the evaluated properties, with the highest temperature (1400 °C) exerting the most influence.

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Section: Caracterização Das Massas Cerâmicasunclassified

Section: Caracterização Das Amostras Tratadas Termicamenteunclassified

Influência da composição e das variáveis de processamento deformulações à base de argilas - uso em materiais refratários

Figueiredo¹,

Fernandes²,

Silva³

et al. 2018

Cerâmica

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show abstract

“…Recently, the development of low cost ceramic membranes based on natural materials such as apatite powder [13], natural raw clay [14][15][16], graphite [17], phosphates [18,19], dolomite, kaolin [20][21][22][23][24] and waste materials such as fly ash [25][26][27][28][29], appeared as an efficient solution to treat waste water at a low cost. The properties of the ceramic membranes are mainly determined by their composition, the pore-former content and the sintering temperature.…”

Section: Introductionmentioning

confidence: 99%

Study of Ceramic Membrane from Naturally Occurring-Kaolin Clays for Microfiltration Applications

Rekik

Bouaziz

Deratani

et al. 2017

Period. Polytech. Chem. Eng.

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The focus of this work is to assess the quality of porous membranes prepared from naturally occurring kaolin clays and to evaluate the performance of tubular ceramic membranes treating integrated raw effluents from seafood industry. This material has been chosen due to its natural abundance, its non-tox IntroductionWater pollution is one of the most important crises in modern times because water is the most important basis of life. There is much current interest in the application of microfiltration and ultrafiltration membranes in separation procedures because of their potential for the treatment of large quantities of wastewater [1][2][3][4][5]. This is a successful way to solve water pollution crisis and to maintain the environment wellness.The use of ceramic membranes has many advantages such as high thermal and chemical stability, pressure resistance, long lifetime, good resistance to fouling, and ease of cleaning [6][7]. Unfortunately, ceramic membrane fabrication, even though commercially available, still remains highly expensive from a technical and economic point of view due to the use of expensive powders such as alumina [8][9][10], zirconia, titania and silica [11,12].Recently, the development of low cost ceramic membranes based on natural materials such as apatite powder [13], natural raw clay [14][15][16], graphite [17], phosphates [18,19], dolomite, kaolin [20][21][22][23][24] and waste materials such as fly ash [25][26][27][28][29], appeared as an efficient solution to treat waste water at a low cost. The properties of the ceramic membranes are mainly determined by their composition, the pore-former content and the sintering temperature.MF is a membrane process for concentration, purification, and fractionation in diverse fields such as food, textile, pharmacy, chemical, paper, and leather industries. MF is often used to remove particles, microorganisms, and colloidal materials from suspensions [30][31][32].Fouling would reduce productivity and potentially shorten membrane life. To understand the mechanisms of fouling, some researchers proposed various models to analyze and predict the flux decline behavior during filtration of macromolecular solutions, among them the resistance-in-series model. According to this model, the flux decline is due to the combined effects of irreversible membrane fouling which is not easy to remove [33,34] but with reversible fouling, rinsing with clean water can solve the problem. The main factors that influence fouling are the physicochemical properties of the membrane, feeding solution and operating conditions.

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“…FA can be classified into three main groups of acidic ash, mildly alkaline ash (pH 8-9), and strongly alkaline ash (pH 11-13) [6]. [65,66], spherical particles of varying sizes and particles of unburned coal [62, 67,68], and predominantly spherical in shape and consisting of solid spheres, cenospheres, irregular-shaped debris and porous unburnt carbon [6]. The morphological characteristics of FA depend on particle size, but cenospheres are an exception.…”

Section: Physical and Chemical Properties Of Fly Ashmentioning

confidence: 99%

Fabrication of Multifunctional Hybrid Composites Using Fly Ash to Control Environmental Pollutants: A Review

Ge¹,

Yoon²,

Choi³

2018

Preprint

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Air pollutants such as volatile organic compounds (VOCs), nitrogen oxides (NOx), sulfur dioxide (SO2), as well as water pollutants including heavy metal, are harmful to human and environment. Effective control and reduction of their pollution is therefore an important topic for today's scientists. Fly ash (FA) is a type of industrial waste that can cause multiple environmental problems if discharged into the air. On the other hand, because of its high porosity, large specific surface area, and other unique characteristics, the FA can also be used as a low-cost and high efficient adsorbent with some simple modifications. This paper reviews the effects of FA on treatment of the above air and water pollution based on our research experience over many years, including to the current status of global FA utilization, physicochemical properties, principle of adsorption, and the application direction of FA in the future. It focuses on the use of nanocomposite technology to fabricate functional FA fibrous membranes to adsorb VOCs from air, and treat heavy metal wastewater. This present review first describes the fabrication technology of FA nanocomposites and their mechanism of adsorption VOCs from air. Utilization of nanofiber technology to fabricate multi-functional FA emerging composite materials to mitigate air and water pollution has great potential in the future, especially use of pollutant material to control other pollutants.

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Recycling of waste fly ash for production of porous mullite ceramic membrane supports with increased porosity

Cited by 170 publications

References 38 publications

Influência da composição e das variáveis de processamento deformulações à base de argilas - uso em materiais refratários

Influência da composição e das variáveis de processamento deformulações à base de argilas - uso em materiais refratários

Study of Ceramic Membrane from Naturally Occurring-Kaolin Clays for Microfiltration Applications

Fabrication of Multifunctional Hybrid Composites Using Fly Ash to Control Environmental Pollutants: A Review

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