Thermodynamic effects of calcium and iron oxides on crystal phase formation in synthetic gasifier slags containing from 0 to 27 wt.% V2O3

Nakano, Jinichiro; Duchesne, Marc; Bennett, James; Kwong, Kyei-Sing; Nakano, Anna; Hughes, Robin

doi:10.1016/j.fuel.2014.11.008

Title: Thermodynamic effects of calcium and iron oxides on crystal phase formation in synthetic gasifier slags containing from 0 to 27 wt.% V2O3

Abstract

Thermodynamic phase equilibria in synthetic slags (Al₂O₃–CaO–FeO–SiO₂–V₂O₃) were investigated with 0–27 wt.% vanadium oxide corresponding to industrial coal–petroleum coke (petcoke) feedstock blends in a simulated gasifier environment. Samples encompassing coal–petcoke mixed slag compositions were equilibrated at 1500 °C in a 64 vol.% CO/36 vol.% CO₂ atmosphere (Po₂ ≈ 10^–8 atm at 1500 °C) for 72 h, followed by rapid water quench, then analyzed by inductively coupled plasma optical emission spectrometry, X-ray diffractometry, and scanning electron microscopy with wavelength dispersive spectroscopy. With increasing CaO content, FeO content, or both; the slag homogeneity region expanded and a composition range exhibiting crystals was reduced. The mullite (Al₆Si₂O₁₃) crystalline phase was not present in the slags above 9 wt.% FeO while the karelianite (V₂O₃) crystalline phase was always present in compositions studied if a sufficient amount of vanadium existed in the slag. Furthermore, based on the present experimental equilibrium evaluation, a set of isothermal phase diagrams showing effects of CaO and FeO on thermodynamic phase stabilities in the vanadium-bearing slags is proposed. Some uses of the diagrams for potential industrial practice are discussed.

Authors:

Nakano, Jinichiro;

; Bennett, James; Kwong, Kyei-Sing; Nakano, Anna; Hughes, Robin

Publication Date:: Tue Dec 01 00:00:00 EST 2015

Research Org.:: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1304160

Alternate Identifier(s):: OSTI ID: 1247731; OSTI ID: 1258473

Report Number(s):: A-CONTR-PUB-056
Journal ID: ISSN 0016-2361; S0016236114010941; PII: S0016236114010941

Grant/Contract Number:: FE0004000

Resource Type:: Published Article

Journal Name:: Fuel

Additional Journal Information:: Journal Name: Fuel Journal Volume: 161 Journal Issue: C; Journal ID: ISSN 0016-2361

Publisher:: Elsevier

Country of Publication:: United Kingdom

Language:: English

Subject:: 36 MATERIALS SCIENCE; phase diagram; equilibrium; coal; petroleum coke; additive agents

Citation Formats


                    Nakano, Jinichiro, Duchesne, Marc, Bennett, James, Kwong, Kyei-Sing, Nakano, Anna, and Hughes, Robin. Thermodynamic effects of calcium and iron oxides on crystal phase formation in synthetic gasifier slags containing from 0 to 27 wt.% V2O3.  United Kingdom: N. p., 2015. 
Web.  doi:10.1016/j.fuel.2014.11.008.

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                    Nakano, Jinichiro, Duchesne, Marc, Bennett, James, Kwong, Kyei-Sing, Nakano, Anna, & Hughes, Robin. Thermodynamic effects of calcium and iron oxides on crystal phase formation in synthetic gasifier slags containing from 0 to 27 wt.% V2O3.  United Kingdom.  https://doi.org/10.1016/j.fuel.2014.11.008

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                    Nakano, Jinichiro, Duchesne, Marc, Bennett, James, Kwong, Kyei-Sing, Nakano, Anna, and Hughes, Robin. Tue .  
"Thermodynamic effects of calcium and iron oxides on crystal phase formation in synthetic gasifier slags containing from 0 to 27 wt.% V2O3".  United Kingdom.  https://doi.org/10.1016/j.fuel.2014.11.008.

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@article{osti_1304160,

  title        = {Thermodynamic effects of calcium and iron oxides on crystal phase formation in synthetic gasifier slags containing from 0 to 27 wt.% V2O3},

  author       = {Nakano, Jinichiro and Duchesne, Marc and Bennett, James and Kwong, Kyei-Sing and Nakano, Anna and Hughes, Robin},

  abstractNote = {Thermodynamic phase equilibria in synthetic slags (Al2O3–CaO–FeO–SiO2–V2O3) were investigated with 0–27 wt.% vanadium oxide corresponding to industrial coal–petroleum coke (petcoke) feedstock blends in a simulated gasifier environment. Samples encompassing coal–petcoke mixed slag compositions were equilibrated at 1500 °C in a 64 vol.% CO/36 vol.% CO2 atmosphere (Po2 ≈ 10–8 atm at 1500 °C) for 72 h, followed by rapid water quench, then analyzed by inductively coupled plasma optical emission spectrometry, X-ray diffractometry, and scanning electron microscopy with wavelength dispersive spectroscopy. With increasing CaO content, FeO content, or both; the slag homogeneity region expanded and a composition range exhibiting crystals was reduced. The mullite (Al6Si2O13) crystalline phase was not present in the slags above 9 wt.% FeO while the karelianite (V2O3) crystalline phase was always present in compositions studied if a sufficient amount of vanadium existed in the slag. Furthermore, based on the present experimental equilibrium evaluation, a set of isothermal phase diagrams showing effects of CaO and FeO on thermodynamic phase stabilities in the vanadium-bearing slags is proposed. Some uses of the diagrams for potential industrial practice are discussed.},

  doi          = {10.1016/j.fuel.2014.11.008},

  journal      = {Fuel},

  number       = C,

  volume       = 161,

  place        = {United Kingdom},

  year         = {Tue Dec 01 00:00:00 EST 2015},

  month        = {Tue Dec 01 00:00:00 EST 2015}

}

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Works referencing / citing this record:

The Effect of Al2O3, CaO and SiO2 on the Phase Relationship in FeO–SiO2 Based Slag with 20 Mass% Vanadium
journal, September 2016

Lindvall, M.; Berg, M.; Sichen, Du
Journal of Sustainable Metallurgy, Vol. 3, Issue 2
DOI: 10.1007/s40831-016-0088-y

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Title: Thermodynamic effects of calcium and iron oxides on crystal phase formation in synthetic gasifier slags containing from 0 to 27 wt.% V2O3

Abstract

Citation Formats

The Effect of Al2O3, CaO and SiO2 on the Phase Relationship in FeO–SiO2 Based Slag with 20 Mass% Vanadium journal, September 2016

The Effect of Al2O3, CaO and SiO2 on the Phase Relationship in FeO–SiO2 Based Slag with 20 Mass% Vanadium
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