The sintering kinetics and properties of sintered glass-ceramics from coal fly ash of different particle size

Zeng, Li; Sun, Hongjuan; Peng, Tongjiang; Zheng, Wenmiao

doi:10.1016/j.rinp.2019.102774

Cited by 43 publications

(19 citation statements)

References 37 publications

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“…Significant amounts of ashes are already used in range of applications, but still there is need to address the potential reuse of ashes. Recent literature reports the application of FA in construction: as raw material in Portland cement clinker [4] and belite-sulfoaluminate clinkers [5], as pozzolanic addition in cement [6], concrete [6,7], light weight aggregate [6], bricks [8], glass-ceramics [9] etc. Also, other uses are being developed, like adsorbents [6,10], zeolites [11], macro and micro nutrients in agriculture [10].…”

Section: Introductionmentioning

confidence: 99%

Technical and radiological characterisation of fly ash and bottom ash from thermal power plant

Fidanchevski

Angjusheva

Jovanov

et al. 2021

J Radioanal Nucl Chem

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Huge quantities of fly ash and bottom ash are generated from thermal power plants and it presents great concern for country, mainly due to the environmental effects. In this study, fly ashes and bottom ash were characterized from technical and radiological aspects. Health effect due to the activity of radionuclides 226Ra, 232Th and 40K was estimated via radium equivalent activity (Raeq), external hazards index (Hex), the external absorbed dose rate (D) and annual effective dose rate (EDR). The specific surface area (40.25 m2 g−1), particle density (1.88 g cm−3) and LOI (23.49%) were typical for bottom ash. Siliceous fly ash contained 32% reactive silica. The annual effective dose rate for all ashes is ≤ 0.2 mSv y−1. Both, fly ash and bottom ash present potential secondary raw materials to be used for building purposes as result of their technological and radiological assessment.

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Section: Introductionmentioning

confidence: 99%

Technical and radiological characterisation of fly ash and bottom ash from thermal power plant

Fidanchevski

Angjusheva

Jovanov

et al. 2021

J Radioanal Nucl Chem

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show abstract

“…The driving force in the sintering process is the surface energy of the powder, which is closely related to the particle size of the powder. Fine particles of glass imply that the prepared products have low sintering temperature, high strength and smooth surface (Zeng et al , 2019). The larger the particle is, the greater the viscous flow tension is required and the higher the sintering temperature is.…”

Section: Resultsmentioning

confidence: 99%

Coupling additive manufacturing and low-temperature sintering: a fast processing route of silicate glassy matrix

Tang¹,

Wang²,

Li³

et al. 2021

RPJ

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Purpose The low-temperature sintering of silica glass combined with additive manufacturing (AM) technology has brought a revolutionary change in glass manufacturing. This study aims to carry out in an attempt to achieve precious manufacturing of silicate glassy matrix through the method of slurry extrusion. Design/methodology/approach A low-cost slurry extrusion modelling technology is used to extrude silicate glassy matrix inks, composed of silicate glass powder with different amounts of additives. Extrudability of the inks, their printability window and the featuring curves of silicate glassy matrix are investigated. In addition, the properties of the low-temperature sintering green part as a functional part are explored and evaluated from morphology, hardness and colour. Findings The results showed that the particle size was mainly distributed from 1.4 µm to 5.3 µm, showing better slurry stability and print continuity. The parameters were set to 8 mm/s, 80% and 0.4 mm, respectively, to achieve better forming of three-dimensional (3D) samples. Besides, the organic binder removal step was concentrated on 200°C–300°C and 590°C–650°C was the fusion bonding temperature of the powder. The hardness values of 10 test samples ranged from 588 HL to 613 HL, which met the requirements of hard stones with super-strong mechanical strength. In addition, the mutual penetration of elements caused by temperature changes may lead to a colourful appearance. Originality/value The custom continuous AM technology enables the fabrication of a glass matrix with 3D structural features. The precise positioning technology of the glass matrix is expected to be applied more widely in functional parts.

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“…% BFS and supplemented by pure chemical reagent to prepare glass-ceramics. The high content of alkaline earth metal oxide in BFS leads to the high alkalinity of base glass, which is not conducive to the sintering process due to the fast crystallization [14]. Therefore, the reagents were mainly acid oxides such as SiO 2 and Al 2 O 3 , and small amounts of oxides such as Na 2 O, K 2 O, BaO and B 2 O 3 were added to adjust the glass melting, clarification, homogenization and sintering process.…”

Section: Raw Materials and Experimental Formulamentioning

confidence: 99%

STRUCTURE AND PROPERTIES OF GLASS-CERAMICS FROM BLAST FURNACE SLAG WITH DIFFERENT A l₂O₃/S iO₂ RATIO

Li¹

2021

Ceramics - Silikaty

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Different Al 2 O 3 /SiO 2 glass-ceramics were prepared from blast furnace slag by sintering method. The structure and properties of glasses or glass-ceramics were investigated by DSC, XRD, SEM, FTIR, 27 Al MAS NMR. The DSC results showed that with the increase of Al 2 O 3 /SiO 2 , the glass transition temperature (T g ) first decreased and then increased, reached the minimum when Al 2 O 3 /SiO 2 was 0.34. The volume density, bending strength and microhardness of glass-ceramics also showed the same variation rule. Structural analysis showed that when the Al 2 O 3 /SiO 2 increased from 0.19 to 0.34, Q 2 gradually transformed into Q 1 and Q 3 ; when the Al 2 O 3 /SiO 2 continued to increase from 0.34 to 0.39, Q 1 and Q 3 decreased while Q 2 increased. The variation of [AlO 4 ] and [AlO 6 ] made the glass network structure the loosest when Al 2 O 3 /SiO 2 was 0.34. Gehlenite was the main crystalline phase in glass-ceramics, and with the increase of Al 2 O 3 /SiO 2 , the precipitation of gehlenite increased, while the precipitation of diopside and hyalophane decreased.

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The sintering kinetics and properties of sintered glass-ceramics from coal fly ash of different particle size

Cited by 43 publications

References 37 publications

Technical and radiological characterisation of fly ash and bottom ash from thermal power plant

Technical and radiological characterisation of fly ash and bottom ash from thermal power plant

Coupling additive manufacturing and low-temperature sintering: a fast processing route of silicate glassy matrix

STRUCTURE AND PROPERTIES OF GLASS-CERAMICS FROM BLAST FURNACE SLAG WITH DIFFERENT A l₂O₃/S iO₂ RATIO

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