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:
- Publication Date:
- 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.
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
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.
@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}
}
https://doi.org/10.1016/j.fuel.2014.11.008
Web of Science
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