Recycling of waste red mud for fabrication of SiC/mullite composite porous ceramics

Wang, Wei; Chen, Weijie; Liu, Haitao

doi:10.1016/j.ceramint.2019.02.024

Cited by 42 publications

(9 citation statements)

References 27 publications

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“…Therefore, the dissolution of Al 2 O 3 in the liquid phase was favored and consequently, the nucleation of mullite crystals. In a later study, the authors investigated the use of this same residue as a starting material for the synthesis of SiC/mullite composite porous ceramics [94]. For this, they used aluminum hydroxide (Al(OH) 3 ), Bayer red sludge and silicon carbide (SiC) as raw materials and studied the effect of V 2 O 5 and AlF 3 as catalysts for the development of low temperature mullite.…”

Section: Aluminum Mining Wastementioning

confidence: 99%

Mullite-Based Ceramics from Mining Waste: A Review

et al. 2021

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Mullite (3Al2O3·2SiO2) is an aluminosilicate characterized by excellent physical properties, which makes it an important ceramic material. In this way, ceramics based on mullite find applications in different technological fields as refractory material (metallurgy, glass, ceramics, etc.), matrix in composite materials for high temperature applications, substrate in multilayer packaging, protective coatings, components of turbine engines, windows transparent to infrared radiation, etc. However, mullite is scarce in nature so it has to be manufactured through different synthesis methods, such as sintering, melting-crystallization or through a sol-gel route. Commonly, mullite is fabricated from pure technical grade raw materials, making the manufacturing process expensive. An alternative to lowering the cost is the use of mining waste as silica (SiO2) and alumina (Al2O3) feedstock, which are the necessary chemical compounds required to manufacture mullite ceramics. In addition to the economic benefits, the use of mining waste brings out environmental benefits as it prevents the over-exploitation of natural resources and reduces the volume of mining waste that needs to be managed. This article reviews the scientific studies carried out in order to use waste (steriles and tailings) generated in mining activities for the manufacture of clay-based ceramic materials containing mullite as a main crystalline phase.

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Section: Aluminum Mining Wastementioning

confidence: 99%

Mullite-Based Ceramics from Mining Waste: A Review

et al. 2021

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“…This development is credited to mullite becoming the main crystalline phase, which offers heightened strength 16 . Furthermore, the process optimization is crucial for achieving the desired performance 17,18 . A porous ceramic, characterized by an apparent porosity of 59.25% and a compressive strength of 70 ± 2.58 MPa, was fabricated using FA cenospheres.…”

Section: Introductionmentioning

confidence: 99%

Analysis and prospect of thermodynamic behavior of aluminosilicate solid waste during ceramization

Jiang,

Chen,

Liu

et al. 2024

Int J Applied Ceramic Tech

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Aluminosilicate solid waste, primarily comprising red mud, coal gangue, fly ash, and tailings, is characterized by high annual production, low comprehensive utilization rate, and significant environmental damage. Currently, there is an urgent need for effective methods to manage and valorize aluminosilicate solid wastes. Thermodynamic investigations enable the assessment of phase transition behaviors, process conditions (such as temperature and pressure), and the direction and feasibility of reactions. Moreover, thermodynamics can predict the composition of resulting products and reveal the reaction mechanisms. All the aforementioned issues are instrumental in refining solid waste treatment processes and achieving efficient use of resources. Therefore, to promote the application of aluminosilicate solid waste, this paper describes the predictive and guiding functions of thermodynamics in the utilization of solid waste, focusing on three aspects: composition design, ceramization, and process optimization. Additionally, current challenges and future trends are discussed herein.

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“…The NaCl-KCl molten salts medium reduced the carbothermic reduction temperature of fly ash effectively [22]. If waste with similar chemical components was used, such as red mud [23], SiC/mullite composite porous ceramics could be prepared under the optimal conditions having 15 wt% graphite and sintered at 1350 • C in air.…”

Section: Introductionmentioning

confidence: 99%

Phase Transformation of Alumina, Silica and Iron Oxide during Carbothermic Reduction of Fly Ash for Ceramics Production

Deng

Feng

et al. 2021

Metals

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Fly ash is a by-product from burning of coal. Utilization of fly ash by carbothermic reduction is an effective way to recover aluminum, silicon, and iron to enhance product-added value. This work is focused on the phase transformation of Al2O3, SiO2 and Fe2O3 during carbothermic reduction of fly ash in air. A comparative analysis of carbothermic reduction of fly ash in air and in nitrogen was made. Thermodynamics analysis was performed to illustrate the possible reactions for residue and condensate. X-ray diffraction (XRD), scanning electronic microscope (SEM), and energy dispersive spectrometry (EDS) were employed to characterize the phase composition, surface morphology, and microstructure of the reduced products. Results show that Fe3Si and Fe2Si appear sequentially with increasing of temperature. Al5O6N is an intermediate compound. Residue of Al9FeSi3, Al, and Si, and condensate of SiC, AlN and C are obtained. β-SiAlON was not found in the residue. Nitrogen is involved in the reduction of Al2O3 but not in the reduction of SiO2 and Fe2O3. Carbothermic reduction of fly ash in air did not behave the same as fly ash in nitrogen.

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Recycling of waste red mud for fabrication of SiC/mullite composite porous ceramics

Cited by 42 publications

References 27 publications

Mullite-Based Ceramics from Mining Waste: A Review

Mullite-Based Ceramics from Mining Waste: A Review

Analysis and prospect of thermodynamic behavior of aluminosilicate solid waste during ceramization

Phase Transformation of Alumina, Silica and Iron Oxide during Carbothermic Reduction of Fly Ash for Ceramics Production

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