Synthesis of Al2O3-SiC composite powders from coal ash in NaCl-KCl molten salts medium

Yin, Yajun; Ma, Beiyue; Li, Shiming; Zhang, Bowen; Yu, Jingkun; Zhang, Zhan; Li, Guangqiang

doi:10.1016/j.ceramint.2016.09.087

Cited by 26 publications

(8 citation statements)

References 28 publications

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“…The sample without SiC additive are composed of β‐SiC, α‐Al 2 O 3 , and FeSi. The formation process of FeSi was discussed in our previous work . FeSi is an accessory substance of reduction reaction among C and Fe 2 O 3 , SiO 2 in coal ash.…”

Section: Resultsmentioning

confidence: 96%

“…In our previous work, the proper mass ratio of coal ash to activated carbon for synthesis of SiC–Al 2 O 3 composite powders by CRR process under Ar atmosphere was determined. So, the mass ratio of coal ash to activated carbon of 100:58 was directly selected in the present work.…”

Section: Methodsmentioning

confidence: 99%

“…Some researchers have reported that using coal ash to synthesize zeolite molecular sieve, alum, and extraction of silica and alumina . Recently, a lot of researches have been focused on using coal ash to synthesize nitrides, carbides, and oxides composite materials, such as Al 2 O 3 ‐SiC, mullite, cordierite, and Sialon …”

Section: Introductionmentioning

confidence: 99%

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Preparation and properties of porous SiC–Al₂O₃ ceramics using coal ash

Yin

et al. 2018

Int J Applied Ceramic Tech

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In this paper, we first reported that porous SiC–Al2O3 ceramics were prepared from solid waste coal ash, activated carbon, and commercial SiC powder by a carbothermal reduction reaction (CRR) method under Ar atmosphere. The effects of addition amounts of SiC (0, 10, 15, and 20 wt%) on the postsintering properties of as‐prepared porous SiC–Al2O3 ceramics, such as phase composition, microstructure, apparent porosity, bulk density, pore size distribution, compressive strength, thermal shock resistance, and thermal diffusivity have been investigated. It was found that the final products are β‐SiC and α‐Al2O3. Meanwhile, the SEM shows the pores distribute uniformly and the body gradually contacts closely in the porous SiC–Al2O3 ceramics. The properties of as‐prepared porous SiC–Al2O3 ceramics were found to be remarkably improved by adding proper amounts of SiC (10, 15, and 20 wt%). However, further increasing the amount of SiC leads to a decrease in thermal shock resistance and mechanical properties. Porous SiC–Al2O3 ceramics doped with 10 wt% SiC and sintered at 1600°C for 5 hours with the median pore diameter of 4.24 μm, room‐temperature compressive strength of 21.70 MPa, apparent porosity of 48%, and thermal diffusivity of 0.0194 cm2/s were successfully obtained.

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Section: Resultsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

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Preparation and properties of porous SiC–Al₂O₃ ceramics using coal ash

Yin

et al. 2018

Int J Applied Ceramic Tech

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“…The Omsk CFA mainly contains 20-35 wt % alumina, 50-65 wt % silica, 5-15 wt % magnetite, and up to 6 wt % unburned carbon [1,2]. Previous research was aimed mainly at studying methods for producing alumina [3][4][5][6], ceramics [7][8][9][10], coagulants [11,12], and the extraction of the rare-earth elements [13][14][15][16][17]. Our previous research was about the leaching of alumosilicates with hydrochloric acid…”

Section: Introductionmentioning

confidence: 99%

Magnetite and Carbon Extraction from Coal Fly Ash Using Magnetic Separation and Flotation Methods

et al. 2019

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In this study, enrichment methods for coal fly ash (CFA) from Omsk thermal power station No. 4 (TPS-4) were investigated. The magnetite and unburned carbon concentrates were obtained by magnetic separation and flotation methods. The wet magnetic separation used in the study increased the magnetite content in the magnetic fraction from 10.48 to 12.72 wt % compared to dry magnetic separation. The XRD analysis showed that the magnetic fraction primarily consists of magnetite, mullite, and quartz. The SEM analysis demonstrated that magnetite is located primarily on the surface of alumosilicate spheres and has three types of shape: dendritic structures, hexagonal bulk agglomerates, and star-like structures. For the flotation tests, a low-price diesel was used as the collector. It was found that, if CFA particles of 40–71 µm are used, ~99% of unburned carbon can be recovered. It was also found by SEM that, if CFA particles of 71–100 µm are used, alumosilicates on a carbon surface prevent complete interaction of diesel with carbon particles and decrease thereby carbon recovery to 83%.

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“…The molten salt method has been widely studied and applied in functional ceramics, lithium-ion battery materials and nanometer materials because of its energy saving and environment protection (Chen et al, 2015(Chen et al, , 2017Ju et al, 2016;Yin et al, 2015). With the molten salt method, coal ash could be used to synthesise new alumina-silicon carbide composite materials (Yin et al, 2016) and prepare aluminium-silicon alloy in solid waste treatment (Liu et al, 2017). As a reaction medium, molten salt could enhance mass transfer.…”

Section: Introductionmentioning

confidence: 99%

The heavy metal leaching property and cementitious material preparation by treating municipal solid waste incineration fly ash through the molten salt process

et al. 2019

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This research investigated the heavy metal leaching property and cementitious material preparation by treating municipal solid waste incineration fly ash through the molten salt process. The results indicated that the heavy metal thermal evaporation of fly ash in the molten salt was related to molten salt composition, heat treatment temperature and atmosphere. After treatment with sodium chloride molten salts (contains 10–50 wt% calcium chloride) from 900°C to 1000°C for 2 h, the leaching concentrations of lead, cadmium, copper, zinc and other heavy metals in fly ash were decreased more than 90% and they could fully meet with the landfill standard. Moreover, after molten salt treatment, the weight fraction of fly ash was reduced by 50 wt% than the original one, and the fly ash has been changed as a kind of cementitious material, which has excellent cementitious property. The X-ray diffraction result indicated that the main crystal mineral composition of cementitious materials obtained was alite, belite, alinite and calcium sulphate.

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Synthesis of Al2O3-SiC composite powders from coal ash in NaCl-KCl molten salts medium

Cited by 26 publications

References 28 publications

Preparation and properties of porous SiC–Al₂O₃ ceramics using coal ash

Preparation and properties of porous SiC–Al₂O₃ ceramics using coal ash

Magnetite and Carbon Extraction from Coal Fly Ash Using Magnetic Separation and Flotation Methods

The heavy metal leaching property and cementitious material preparation by treating municipal solid waste incineration fly ash through the molten salt process

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Synthesis of Al2O3-SiC composite powders from coal ash in NaCl-KCl molten salts medium

Cited by 26 publications

References 28 publications

Preparation and properties of porous SiC–Al2O3 ceramics using coal ash

Preparation and properties of porous SiC–Al2O3 ceramics using coal ash

Magnetite and Carbon Extraction from Coal Fly Ash Using Magnetic Separation and Flotation Methods

The heavy metal leaching property and cementitious material preparation by treating municipal solid waste incineration fly ash through the molten salt process

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Preparation and properties of porous SiC–Al₂O₃ ceramics using coal ash

Preparation and properties of porous SiC–Al₂O₃ ceramics using coal ash