Preparation and characterization of mullite powders from coal fly ash by the mullitization and hydrothermal processes

Li, Yingde; Lu, Jinshan; Zeng, Youpeng; Liu, Zhiyong; Wang, Chunlei

doi:10.1016/j.matchemphys.2018.04.056

Cited by 18 publications

(7 citation statements)

References 41 publications

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“…8,9 Mullite (3Al 2 O 3 •2SiO 2 ) has low thermal conductivity and high stability at high temperatures, making it an important ceramic material. 10,11 Mullite is synthesized by various methods to solve the problem of scarcity in nature. 12,13 Wang et al 14 synthesized mullite ceramics with Al 2 O 3 and SiO 2 by using spark plasma sintering (SPS).…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and mechanical properties of mullite ceramics with coal gangue and wastes refractory as raw materials

Liu

Lian

et al. 2019

Int J Applied Ceramic Tech

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With coal gangue and high alumina refractory solid wastes as raw materials, needle-like mullite powder, with an average diameter of about 1 μm, was synthesized at 1300°C by using the conventional solid-state reaction method. Mullite ceramics were derived from the inexpensive needle-like powder. Phase composition was examined by using X-ray diffraction (XRD), while morphologies of the ceramics were observed by using scanning electron microscopy. The content and distribution of elements in the sintered samples were characterized with energy dispersive spectrometer and X-ray fluorescence spectroscopy. Mechanical properties of the mullite ceramics were studied by using the three-point bending method. The aspect ratio of the needle-like mullite particles was up to 6. The mullite sample sintered at 1500°C for 3 hours had a density of 2.515 g•cm −3 , which was slightly lower than the theoretical density. Maximum fracture toughness and bending strength of the mullite ceramics were 1.82 MPa•m 1/2 and 71.76 MPa, respectively. This study realizes the resource utilization of gangue and high alumina refractory solid wastes, and the prepared mullite ceramics have good application prospect.

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Section: Introductionmentioning

confidence: 99%

“…17 Yingde Li et al successfully prepared mullite powder by the mullitization and hydrothermal processes. 11 Zhang Wang et al prepared mullite foams from coal-series kaolin by freeze-cast. 16 The mechanical properties of ceramics have not been explored by these authors.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and mechanical properties of mullite ceramics with coal gangue and wastes refractory as raw materials

Liu

Lian

et al. 2019

Int J Applied Ceramic Tech

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“…Therefore, bauxite [122][123][124], pure Al 2 O 3 [125,126], Al(OH) 3 [127], AlF 3 [124,128] [123] have also prepared porous mullite using FA and other alumina sources. Li et al (2018) [129] have synthesized mullite powder from FA through mullitization and hydrothermal process. Boehmite sol is mixed with the pre-calcined FA powder and again calcined at 900-1300°C.…”

Section: Mullitementioning

confidence: 99%

Sustainable ceramics derived from solid wastes: a review

Hossain

Roy

2020

Journal of Asian Ceramic Societies

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Wastes from different manufacturing processes and energy generation unite are attributed to the ecological and health issues. Instead of land-filling, the waste can be recycled or reused to convert marketable value-added products with high ecologic and economic interest. Ceramics are attracting particularly in waste recycling perceptions. From this eco-friendly propensity, in the last two decades, an increasing number of studies have demonstrated the possibility to use alternative ingredients in the place of conventional raw materials (e.g., most common ternary clay-quartz-feldspar system) for the fabrication of ceramics. Researchers are trying to incorporate the wastes and industrial by-products like fly ash (FA), rice husk ash (RHA), blast furnace slag (BFS), sludge, glass waste, polished tile waste, eggshell and others for making different ceramics. The present review is aimed to provide an up-to-date overview of the recent wastederived ceramics including refractories, glasses, whitewares, oxide and non-oxide ceramics with the correlation of waste incorporation limits, manufacturing routes, and properties of the ceramics. The investigation reveals that ceramic industries have huge potential to utilize the wastes as substitution of the natural raw materials. The waste to value-added ceramics conversion not only solves the disposal problems but also conserves the natural resources.

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“…Mullite has been synthesized using various methods, such as sol‐gel process, chemical syntheses, 13,14 co‐precipitation, 6,15 hydrothermal reaction, 16,17 flash combustion, 18–19 and chemical vapor deposition 20,21 . However, the production of high‐purity and high‐density mullite is still a challenge.…”

Section: Introductionmentioning

confidence: 99%

Phase formation, microstructure development, and mechanical properties of kaolin‐based mullite ceramics added with Fe₂O₃

Zhenying

Lian

Liu

et al. 2021

Int J Applied Ceramic Tech

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Mullite is an excellent ceramic material due to the unique properties, such as low coefficient of thermal expansion, high corrosion resistance to acid and alkali, high-temperature creep resistance, strong thermal shock resistance, high chemical and thermal stability, high permeability, and excellent mechanical properties. [1][2][3] Mullite ceramics have been widely utilized as metallurgical, glass, ceramic, and other industrial refractory materials. [4][5][6] They are also widely used as heatresistant materials, such as crucibles, protective tubes, and thermocouple tubes for electronic packaging. [7][8][9] Other applications include window materials under harsh chemical conditions and mechanical stress at high temperatures. [10][11][12] Mullite has been synthesized using various methods, such as sol-gel process, chemical syntheses, 13,14 co-precipitation, 6,15 hydrothermal reaction, 16,17 flash combustion, [18][19] and chemical vapor deposition. 20,21 However,

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Preparation and characterization of mullite powders from coal fly ash by the mullitization and hydrothermal processes

Cited by 18 publications

References 41 publications

Synthesis and mechanical properties of mullite ceramics with coal gangue and wastes refractory as raw materials

Synthesis and mechanical properties of mullite ceramics with coal gangue and wastes refractory as raw materials

Sustainable ceramics derived from solid wastes: a review

Phase formation, microstructure development, and mechanical properties of kaolin‐based mullite ceramics added with Fe₂O₃

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Preparation and characterization of mullite powders from coal fly ash by the mullitization and hydrothermal processes

Cited by 18 publications

References 41 publications

Synthesis and mechanical properties of mullite ceramics with coal gangue and wastes refractory as raw materials

Synthesis and mechanical properties of mullite ceramics with coal gangue and wastes refractory as raw materials

Sustainable ceramics derived from solid wastes: a review

Phase formation, microstructure development, and mechanical properties of kaolin‐based mullite ceramics added with Fe2O3

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Phase formation, microstructure development, and mechanical properties of kaolin‐based mullite ceramics added with Fe₂O₃