Study on structural and compositional transitions of coal ash by using NMR

Xiong Chao Lin; Keiko Ideta; Jin Miyawaki; Hiromichi Takebe; Yong Gang Wang; Seong Ho Yoon; Isao Mochida

doi:10.1007/s12404-012-0114-z

Study on structural and compositional transitions of coal ash by using NMR

Xiong Chao Lin, Keiko Ideta, Jin Miyawaki, Hiromichi Takebe, Yong Gang Wang, Seong Ho Yoon, Isao Mochida

Department of Advanced Device Materials

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Structural and compositional transitions of Datong coal ash and its CaCO ₃ additional effects were carefully examined at a temperature range of 300 to 1 600 °C by using XRD and solid state NMR. The quantitative estimation of amorphous structures of ashes can be successfully obtained through the analyses of solid state NMR spectra. Viscosity of molten ash and its changes with CaCO ₃ addition were also evaluated up to 1 700°C by using a rotary type viscometer. Glasses with poor crystalline and amorphous phase were continuously formed through the eutectic reaction of silica above fusing temperature (FT>1 500°C) that caused broadening and shift of ²⁹Si and ²⁷Al peaks in NMR results. With the additional amount of CaCO ₃ increasing, the peaks shifted to downfield obviously; the fraction of Si(OAl) ₀(OSi) ₄ decreased, while that of Si(OAl) ₁(OSi) ₁ at -84.3×10 ^-6 increased apparently. These transitions indicated the destruction of large alumina-silicate framework into small segments by the addition of Ca ion.

Original language	English
Pages (from-to)	80-87
Number of pages	8
Journal	Journal of Coal Science and Engineering
Volume	18
Issue number	1
DOIs	https://doi.org/10.1007/s12404-012-0114-z
Publication status	Published - Mar 2012

All Science Journal Classification (ASJC) codes

Geotechnical Engineering and Engineering Geology
Energy Engineering and Power Technology

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title = "Study on structural and compositional transitions of coal ash by using NMR",

abstract = "Structural and compositional transitions of Datong coal ash and its CaCO 3 additional effects were carefully examined at a temperature range of 300 to 1 600 °C by using XRD and solid state NMR. The quantitative estimation of amorphous structures of ashes can be successfully obtained through the analyses of solid state NMR spectra. Viscosity of molten ash and its changes with CaCO 3 addition were also evaluated up to 1 700°C by using a rotary type viscometer. Glasses with poor crystalline and amorphous phase were continuously formed through the eutectic reaction of silica above fusing temperature (FT>1 500°C) that caused broadening and shift of 29Si and 27Al peaks in NMR results. With the additional amount of CaCO 3 increasing, the peaks shifted to downfield obviously; the fraction of Si(OAl) 0(OSi) 4 decreased, while that of Si(OAl) 1(OSi) 1 at -84.3×10 -6 increased apparently. These transitions indicated the destruction of large alumina-silicate framework into small segments by the addition of Ca ion.",

author = "Lin, {Xiong Chao} and Keiko Ideta and Jin Miyawaki and Hiromichi Takebe and Wang, {Yong Gang} and Yoon, {Seong Ho} and Isao Mochida",

note = "Funding Information: The authors gratefully acknowledge the financial support provided by the New Energy and Industrial Technology Development Organization (NEDO) and Global Center of Excellence (GCOE) of Japan.",

year = "2012",

month = mar,

doi = "10.1007/s12404-012-0114-z",

language = "English",

volume = "18",

pages = "80--87",

journal = "Journal of Coal Science and Engineering",

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T1 - Study on structural and compositional transitions of coal ash by using NMR

AU - Lin, Xiong Chao

AU - Ideta, Keiko

AU - Miyawaki, Jin

AU - Takebe, Hiromichi

AU - Wang, Yong Gang

AU - Yoon, Seong Ho

AU - Mochida, Isao

N1 - Funding Information: The authors gratefully acknowledge the financial support provided by the New Energy and Industrial Technology Development Organization (NEDO) and Global Center of Excellence (GCOE) of Japan.

PY - 2012/3

Y1 - 2012/3

N2 - Structural and compositional transitions of Datong coal ash and its CaCO 3 additional effects were carefully examined at a temperature range of 300 to 1 600 °C by using XRD and solid state NMR. The quantitative estimation of amorphous structures of ashes can be successfully obtained through the analyses of solid state NMR spectra. Viscosity of molten ash and its changes with CaCO 3 addition were also evaluated up to 1 700°C by using a rotary type viscometer. Glasses with poor crystalline and amorphous phase were continuously formed through the eutectic reaction of silica above fusing temperature (FT>1 500°C) that caused broadening and shift of 29Si and 27Al peaks in NMR results. With the additional amount of CaCO 3 increasing, the peaks shifted to downfield obviously; the fraction of Si(OAl) 0(OSi) 4 decreased, while that of Si(OAl) 1(OSi) 1 at -84.3×10 -6 increased apparently. These transitions indicated the destruction of large alumina-silicate framework into small segments by the addition of Ca ion.

AB - Structural and compositional transitions of Datong coal ash and its CaCO 3 additional effects were carefully examined at a temperature range of 300 to 1 600 °C by using XRD and solid state NMR. The quantitative estimation of amorphous structures of ashes can be successfully obtained through the analyses of solid state NMR spectra. Viscosity of molten ash and its changes with CaCO 3 addition were also evaluated up to 1 700°C by using a rotary type viscometer. Glasses with poor crystalline and amorphous phase were continuously formed through the eutectic reaction of silica above fusing temperature (FT>1 500°C) that caused broadening and shift of 29Si and 27Al peaks in NMR results. With the additional amount of CaCO 3 increasing, the peaks shifted to downfield obviously; the fraction of Si(OAl) 0(OSi) 4 decreased, while that of Si(OAl) 1(OSi) 1 at -84.3×10 -6 increased apparently. These transitions indicated the destruction of large alumina-silicate framework into small segments by the addition of Ca ion.

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Study on structural and compositional transitions of coal ash by using NMR

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