Fly Ash Constituent-Silica and Alumina Role in the Synthesis and Characterization of Cordierite Based Ceramics

Kumar, Manmohan; Vanmathi, M.; Senguttuvan, G.; Mangalaraja, Ramalinga Viswanathan; Sakthivel, G.

doi:10.1007/s12633-018-0049-0

Cited by 19 publications

(7 citation statements)

References 55 publications

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“…6 However, fly ash as a secondary product from power plants can also be a source of aluminium and silicon oxides that can be utilized as raw materials for sintering forsterite-spinel ceramics. [7][8][9][10][11] The formation of MA spinel from the mixtures with fly ash also occurred in our previous work. [12][13] The main objective of this work is the clarification of the formation and influence of an MA spinel on the resulting properties of forsterite ceramics.…”

Section: Introductionsupporting

confidence: 57%

Formation and influence of magnesium-alumina spinel on the properties of refractory forsterite-spinel ceramics

Nguyen¹,

Sokolar²

2020

Mater. Tehnol.

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Forsterite refractory ceramic is mostly used in the cement industry as the lining of a rotary kiln and as the lining of metallurgical furnaces due to its high refractoriness of up to 1850°C. Another significant property of forsterite is its coefficient of linear thermal expansion used in the electrotechnical industry for ceramic-metal joints. An addition of aluminium oxide to a raw-material mixture results in the creation of a magnesium-alumina spinel (MgO•Al2O3), which improves the sintering and mechanical properties of forsterite ceramics. An inexpensive source of aluminium oxide is fly ash. The utilization of fly ash, a secondary energy product of coal-burning power plants, is important for the environment and sustainable development. This paper evaluates the transformation of mullite (3Al2O3•2SiO2) from fly ash into a magnesium-alumina spinel, its influence during the synthesis and the resulting properties of a fired forsterite refractory ceramic body. Forsterite-spinel ceramics were synthesized from olivine, calcined magnesite and 0-20 % of fly-ash powders. XRD analyses were used to determine the mineralogical composition, thermal analyses were used to determine the formation of spinel and its behaviour during the firing, and scanning electron microscopy (SEM) was used to determine the morphology of crystal phases. The refractoriness of pyrometric cones, refractoriness under load, thermal-shock resistance, water absorption, porosity and mechanical properties of the fired test samples were also determined. The transformation of mullite resulted in small amounts of magnesium-alumina spinel in the forsterite ceramics. Test results showed that the presence of magnesium-alumina spinel improved the sintering, microstructure, thermal-shock resistance and mechanical properties in comparison with pure-forsterite refractory ceramics.

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Section: Introductionsupporting

confidence: 57%

Formation and influence of magnesium-alumina spinel on the properties of refractory forsterite-spinel ceramics

Nguyen¹,

Sokolar²

2020

Mater. Tehnol.

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“…This material also possesses high chemical resistance and a low dielectric constant. The synthesis of cordierite from fly ash requires MgO supplementing materials such as talc [ 118 ], magnesia [ 119 ], magnesite [ 120 ], or dolomite [ 121 ]. Unlike mullite, the sintering temperature of cordierite ceramics is usually below 1200°C.…”

Section: Firing-associated Recycling Of Fly Ashmentioning

confidence: 99%

Firing-Associated Recycling of Coal-Fired Power Plant Fly Ash

Minh

Pham

Tung

et al. 2023

Journal of Analytical Methods in Chemistry

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Coal-fired power plant fly ash is a global environmental concern due to its small particle size, heavy metal content, and increased emissions. Although widely used in concrete, geopolymer, and fly ash brick production, a large amount of fly ash remains in storage sites or is used in landfills due to inadequate raw material quality, resulting in a waste of a recoverable resource. Therefore, the ongoing need is to develop new methods for recycling fly ash. The present review differentiates the physiochemical properties of fly ash from two coal combustion processes: fluidized bed combustion and pulverized coal combustion. It then discusses applications that can consume fly ash without strict chemical requirements, focusing on firing-associated methods. Finally, the challenges and opportunities of fly ash recycling are discussed.

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“…Oxid křemičitý a hlinitý lze využít právě při slinování žárovzdorné keramiky. Elektrárenský popílek byl využitý v mnoha vědeckých studiích s dobrými výslednými vlastnostmi [8,9]. Spinelová keramika se společně s magnezitem především využívá také jako vyzdívka rotačních pecí pro výrobu cementu a vápna díky velmi vysokému bodu tání 2135 °C, nízké teplotní roztažnosti v porovnání s forsteritovou keramikou a také dobrou odolností proti náhlým změnám teplot a korozní odolností [6,7,10].…”

Section: úVodunclassified

Žárovzdorné Vlastnosti a Korozní Odolnost Forsterit-Spinelové Keramiky S Využitím Vysokoteplotního Popílku

Nguyen

Sokolar

2021

CzeJCivEng

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Tento článek se zabývá procesem syntézy žárovzdorné forsterit-spinelové keramiky za použití vysokoteplotního popílku a reaktivního oxidu hlinitého jako zdroje oxidu hlinitého. Vstupní suroviny byly rozemlety, smíchány v různém poměru a vypáleny při 1500 °C po dobu 2 h. Vypálené zkušební vzorky byly charakterizovány pomocí RTG difrakční analýzy a rastrovacího elektronového mikroskopu. Rovněž byla zkoumána pórovitost, nasákavost, objemová hmotnost, žárovzdornost, únosnost v žáru, odolnost proti změnám teplot a korozní odolnost vůči účinkům taveniny železa. Výsledné vlastnosti byly poté porovnány v závislosti na zdroji oxidu hlinitého. Přítomnost spinelu ve vzorcích vedla ke zlepšení mikrostruktury, mechanických vlastností, odolnosti proti změnám teplot a také korozní odolnosti. Zejména směsi s 10–20 % spinelu měly nejslibnější výsledky.

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Fly Ash Constituent-Silica and Alumina Role in the Synthesis and Characterization of Cordierite Based Ceramics

Cited by 19 publications

References 55 publications

Formation and influence of magnesium-alumina spinel on the properties of refractory forsterite-spinel ceramics

Formation and influence of magnesium-alumina spinel on the properties of refractory forsterite-spinel ceramics

Firing-Associated Recycling of Coal-Fired Power Plant Fly Ash

Žárovzdorné Vlastnosti a Korozní Odolnost Forsterit-Spinelové Keramiky S Využitím Vysokoteplotního Popílku

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