Preparation of sintered foamed ceramics derived entirely from coal fly ash

Luo, Yanhong; Zheng, Shili; Ma, Shuhua; Liu, Chunli; Wang, Xiaohui

doi:10.1016/j.conbuildmat.2017.12.102

Cited by 68 publications

(21 citation statements)

References 32 publications

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“…Notably, there were many closed circular pores presented in the produced ceramics. The formation of closed pores was similar to the formation mechanism of porous volcanic rocks in nature . In the early stage of sintering, the crystalline water in the zeolite P was gradually removed and formed porous dehydration intermediate, which further increased the pores of alkali pretreated fly ash.…”

Section: Resultsmentioning

confidence: 56%

“…In the early stage of sintering, the crystalline water in the zeolite P was gradually removed and formed porous dehydration intermediate, which further increased the pores of alkali pretreated fly ash. Then near the melting temperature, many pores of porous dehydration intermediate were enclosed by liquid phase and the closed pores were well preserved during cooling process …”

Section: Resultsmentioning

confidence: 99%

“…Luo et al. found that the porous structure and crystalline water of zeolite promoted the formation of pores of porous ceramics . Luo et al.…”

Section: Introductionmentioning

confidence: 99%

“…Previous literature also stated that with alkaline pretreatment, sintering temperature for ceramics production could be reduced . Moreover, theoretically, zeolite could be formed when fly ash was treated with alkali .…”

Section: Introductionmentioning

confidence: 99%

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New insight into the modification of pore structure in porous ceramics prepared from fly ash rich in CaO

Zhang

Jiang

et al. 2019

ChemistrySelect

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Porous ceramics with high open porosity and good mechanical properties were successfully prepared from fly ash rich in CaO. An addition of 30–50wt.% dolomite decreased the average pore diameter from ∼11.79 μm to ∼2.82μm due to the decrease of viscosity with high dolomite addition, while there is an increase in open porosity from 48.63% to 53.23%. SEM results suggested that pores were firstly surrounded by glassy phase. With the addition of more than 30 wt.% of dolomite, pores were covered by loose structure. XRD results showed the changes in crystal phases of sintered ceramics, from anorthite sodian to alkaline basalt and then to calcium magnesium silicate. CaO and MgO from decomposed dolomite were proposed to be the main reason on modification closed pores to open ones. Except this, CO2 emission and crystalline water emission during sintering were also contributed to the formation of open pores in porous ceramics.

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Section: Resultsmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 99%

“…Luo et al. found that the porous structure and crystalline water of zeolite promoted the formation of pores of porous ceramics . Luo et al.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New insight into the modification of pore structure in porous ceramics prepared from fly ash rich in CaO

Zhang

Jiang

et al. 2019

ChemistrySelect

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“…Siliceous fly ash is a waste material created during combustion of coal in pulverized coal boilers, accumulated in the dust removal zone [1]. It is used in the building materials industry as a raw material for the production of Portland clinker [2], as an addition to cement [3,4], mortar [5] and concrete [6][7][8], as well as sintered ceramic products [9,10]. Fly ash was also researched as a starting material for the production of high-degree-of-consolidation and low-porosity ceramics [11,12].…”

Section: Introductionmentioning

confidence: 99%

Thermal studies of fly ashes expansion

Wons

Rzepa

Reben

et al. 2020

J Therm Anal Calorim

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The object of this study is to investigate the thermal properties of fly ashes from the last, farthest dedusting zone in terms of their use as ceramic masses additives. Siliceous fly ash is valuable additive to ceramic mass, which not only reduces its plasticity, but also actively affects sintering process and shapes the properties of the final material. The finest fly ash fractions are potentially useful flux materials in ceramics; however, a significant limitation in their use is due to thermal expansion/ bloating occurring during high-temperature sintering. The bloating mechanism of fly ashes was investigated in relationship to their chemical composition with the use of DTA/TG/EGA analysis as well as high-temperature microscope. Chemical and phase compositions were studied by X-ray fluorescence and X-ray diffraction. Based on the results obtained, it can be concluded. The results indicate that bloating mechanism is caused by the co-occurrence of two phenomena accompanying sintering: appearance of high amount of liquid phase and simultaneous gas release from sintered material. The dominant mechanism is the simultaneous release of sulfur (IV) oxide and oxygen as a result of the redox reaction of removing SO 3 from the vitreous phase.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Recycled gypsum board acted as a mineral swelling agent for improving thermal conductivity characteristics in manufacturing of green lightweight building brick

Chiang

Yen

2018

Environ Sci Pollut Res

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Preparation of sintered foamed ceramics derived entirely from coal fly ash

Cited by 68 publications

References 32 publications

New insight into the modification of pore structure in porous ceramics prepared from fly ash rich in CaO

New insight into the modification of pore structure in porous ceramics prepared from fly ash rich in CaO

Thermal studies of fly ashes expansion

Recycled gypsum board acted as a mineral swelling agent for improving thermal conductivity characteristics in manufacturing of green lightweight building brick

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