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Study on the Overall Reaction Pathways and Structural Transformations during Decomposition of Coal Fly Ash in the Process of Alkali-Calcination
- Source :
- Materials, Volume 14, Issue 5, Materials, Vol 14, Iss 1163, p 1163 (2021)
- Publication Year :
- 2021
- Publisher :
- MDPI, 2021.
-
Abstract
- In this research, phase transformation and the role of NaOH on the structure of coal fly ash (CFA) during an alkali-calcination process were identified by a combination of X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) and deconvolution analysis. The variation in the different functional groups and structural parameters of the raw and post-alkali calcinated CFA were analysed by deconvolution of the FTIR results, conducted with a Gaussian approach. The results, firstly, provide a deep insight into the functional groups in CFA. In CFA systems, the vibration signals of Q0, Q1, Q2 and Q3 were detected and the dominant structural units associated with Si tetrahedron groups were isolated to Q3 and Q2. Deconvolution analysis of the band from 400 to 1400 cm−1 showed that the added NaOH resulted in an increase in Q1 at the cost of Q3 and Q2 and the degree of reaction of the CFA was, therefore, decreased. Concurrently, it was established that the changes in the Gaussian peak component were related to the calcination temperature and time that allowed us to tailor the model of the structural decomposition of CFA.
- Subjects :
- Materials science
0211 other engineering and technologies
Analytical chemistry
02 engineering and technology
lcsh:Technology
complex mixtures
Article
coal fly ash
law.invention
alkaline calcination
symbols.namesake
functional groups
law
TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY
021105 building & construction
General Materials Science
Calcination
Fourier transform infrared spectroscopy
lcsh:Microscopy
lcsh:QC120-168.85
Degree of reaction
lcsh:QH201-278.5
lcsh:T
021001 nanoscience & nanotechnology
Decomposition
Fourier transform
FTIR
lcsh:TA1-2040
Fly ash
symbols
lcsh:Descriptive and experimental mechanics
lcsh:Electrical engineering. Electronics. Nuclear engineering
Deconvolution
lcsh:Engineering (General). Civil engineering (General)
0210 nano-technology
lcsh:TK1-9971
Powder diffraction
Subjects
Details
- Language :
- English
- ISSN :
- 19961944
- Volume :
- 14
- Issue :
- 5
- Database :
- OpenAIRE
- Journal :
- Materials
- Accession number :
- edsair.doi.dedup.....659cdbd452e5fe1da03304c3ba8ab7eb