Preparation and properties of porous MgO based ceramics from magnesite tailings and fused magnesia

Ma, Beiyue; Zan, Wenyu; Liu, Kun; Mu, Xin; Deng, Chengji; Huang, Ao

doi:10.1016/j.ceramint.2023.03.034

Cited by 26 publications

(6 citation statements)

References 48 publications

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“…Magnesium oxide is an inexpensive catalyst with a high catalytic potential for degrading pollutants such as dyes or drugs [1][2][3]. Numerous studies have shown that magnesium oxide possesses high surface reactivity and strong surface alkalinity [4].…”

Section: Introductionmentioning

confidence: 99%

Preparation of porous nano-magnesium oxide using a corn starch template method

Chen,

Mu,

Jiang

et al. 2024

J. Phys.: Conf. Ser.

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Nano-porous magnesium oxide was prepared using a corn starch template and a magnesium nitrate hexahydrate precursor, and characterized by TGA, XRD, FTIR, EDS, TEM, and BET surface area analysis. The results showed that porous magnesium oxide composed of nano-particles could be obtained using this method. The final magnesium oxide product was in the form of large flakes under low magnification, and the flakes were composed of small nano-scale particles under high magnification. The particle size of nano-porous magnesium oxide was 20–28 nm, the specific surface area was 29.37 m2/g, and the average pore diameter was 19 nm.

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Section: Introductionmentioning

confidence: 99%

Preparation of porous nano-magnesium oxide using a corn starch template method

Chen,

Mu,

Jiang

et al. 2024

J. Phys.: Conf. Ser.

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“…The pore-structural parameters and microstructures of porous corundum aggregates considerably affect the bulk density, thermal conductivity, and slag resistance of Al 2 O 3 -MgO refractory castables. [17][18][19] The preparation methods of porous corundum-based aggregates, including high-temperature foaming, 20 in situ decomposition, 12,19,21 and pore-forming agent addition, 7,18,22 have been extensively studied. Yuan et al 20 fabricated porous Al 2 O 3 -based aggregates with a closed porosity of ∼16% using submicron-sized Al 2 O 3 and MgO powders as raw materials and SiC as a hightemperature foaming agent.…”

Section: Introductionmentioning

confidence: 99%

“…The pore‐structural parameters and microstructures of porous corundum aggregates considerably affect the bulk density, thermal conductivity, and slag resistance of Al 2 O 3 –MgO refractory castables 17–19 . The preparation methods of porous corundum‐based aggregates, including high‐temperature foaming, 20 in situ decomposition, 12,19,21 and pore‐forming agent addition, 7,18,22 have been extensively studied. Yuan et al 20 .…”

Section: Introductionmentioning

confidence: 99%

Properties and microstructures of porous corundum‐spinel aggregates fabricated via the Kirkendall effect

He,

Mi,

Chen

et al. 2024

Int J Applied Ceramic Tech

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Four porous corundum‐spinel aggregates were prepared from magnesia and α‐Al2O3 micropowder via the Kirkendall effect. Effects of the particle size of magnesia (PSM, 0–74 μm, 0–15 μm, and 0–44 μm) and firing temperature (1100–1600°C) on the phase compositions, microstructures, pore characteristics of the prepared porous aggregates were investigated. As the firing temperature increased, the PSM influenced the reaction rate of magnesia and alumina, and the sintering process, leading to remarkable changes in the phase compositions, porosity, and microstructure with a negligible impact on the pore size distribution. As the PSM decreased from 0–74 μm to 0–15 μm, the apparent porosity initially increased and then decreased. Relatively compact cyclic spinels formed around the Kirkendall pores in aggregates with 0–74 μm and 0–44 μm magnesia added after fired at 1600°C, as the expansion of spinel formation was inhibited by the high strength of the alumina matrix. Finally, the optimized product is an aggregate with 0–44 μm magnesia added, which exhibits a high total porosity of 32.4%, a low bulk density of 2.69 g/cm3, and a thermal conductivity of 2.178 W/(m·K) at 1000°C, as well as a high compressive strength of 302.5 MPa and a small median pore size of .46 μm. This work provides a promising technique for preparing porous‐corundum‐based aggregates.

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“…9 Starch, pulverized coal, dolomite, and SiC are also foaming agents for preparing porous ceramics with good properties. 3,6,[13][14][15] Similarly, industrial solid waste can also be used as foaming agent to promote ceramic foaming. For example, vanadium titanomagnetite tailings are used as the main foaming agent to prepare composite foam ceramics, 16 and porous ceramics with good performance are prepared using asbestos tailings, waste glass (or coal fly ash), altered rock gold tailings and alkali slag as raw materials.…”

Section: Introductionmentioning

confidence: 99%

“…With increasing calcium carbonate dosage, the porosity of foaming ceramics increases linearly, while the compressive strength decreases significantly 9 . Starch, pulverized coal, dolomite, and SiC are also foaming agents for preparing porous ceramics with good properties 3,6,13–15 . Similarly, industrial solid waste can also be used as foaming agent to promote ceramic foaming.…”

Section: Introductionmentioning

confidence: 99%

Effect and mechanism of Fe₂O₃ decomposition in the preparation of foaming ceramics from industrial solid waste

Chen,

Luo,

Sun

et al. 2023

Int J Applied Ceramic Tech

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MgO–Al2O3–SiO2 foam ceramics were prepared by direct sintering of asbestos tailings and coal fly ash by spontaneous bubble process. By X‐ray diffraction, scanning electron microscopy, Fourier‐transform infrared spectroscopy, X‐ray photoelectron spectroscopy, and thermodynamic analysis, the effect of Fe2O3 decomposition on the preparation of foaming ceramics from industrial solid waste and the pore‐forming process was studied. The results show that the foaming effect of foaming ceramics with higher raw iron content is better when the roasting temperature is higher. Increasing the content of iron is beneficial to the formation of cordierite, and increasing the roasting temperature is beneficial to the relative content of spinel in foaming ceramics. Combined with the change in the Fe valence state, content in porous ceramic samples, and thermodynamic analysis of the product, it is found that Fe2O3 decomposition is the fundamental cause of ceramic foaming at high temperature. Fe2+ produced after decomposition replaces Mg2+ into spinel and cordierite structures, and the O2 produced by decomposition cannot be discharged in time to cause ceramic foaming. The research results can provide theoretical basis for the preparation of industrial solid waste foamed ceramics.

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Preparation and properties of porous MgO based ceramics from magnesite tailings and fused magnesia

Cited by 26 publications

References 48 publications

Preparation of porous nano-magnesium oxide using a corn starch template method

Preparation of porous nano-magnesium oxide using a corn starch template method

Properties and microstructures of porous corundum‐spinel aggregates fabricated via the Kirkendall effect

Effect and mechanism of Fe₂O₃ decomposition in the preparation of foaming ceramics from industrial solid waste

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Preparation and properties of porous MgO based ceramics from magnesite tailings and fused magnesia

Cited by 26 publications

References 48 publications

Preparation of porous nano-magnesium oxide using a corn starch template method

Preparation of porous nano-magnesium oxide using a corn starch template method

Properties and microstructures of porous corundum‐spinel aggregates fabricated via the Kirkendall effect

Effect and mechanism of Fe2O3 decomposition in the preparation of foaming ceramics from industrial solid waste

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Product

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Effect and mechanism of Fe₂O₃ decomposition in the preparation of foaming ceramics from industrial solid waste