TY - JOUR
T1 - Effects of Slag Composition on H 2 Generation and Magnetic Precipitation from Molten Steelmaking Slag–Steam Reaction
AU - Li, Juncheng
AU - Bhattacharjee, Debashish
AU - Hu, Xiaojun
AU - Zhang, Dianwei
AU - Sridhar, Seetharaman
AU - Li, Zushu
N1 - Funding Information:
This work was supported by the Innovate UK (for Tata Steel UK), EPSRC (for the University of Warwick EP/M507829/1), and MOST (Ministry of Science and Technology) China (for the USTB and Shougang Corp.) under the Project No. 102170. The author Zushu Li would like to thank EPSRC for financial support under Grant No. EP/N011368/1.
Publisher Copyright:
© 2019, The Minerals, Metals & Materials Society and ASM International.
PY - 2019/4/15
Y1 - 2019/4/15
N2 - In this paper, the effects of slag composition (slag basicity CaO/SiO 2 and FeO concentration) on the amounts of H 2 gas generated and the magnetic spinel phase precipitated as a result of the reaction between synthetic steelmaking slag and steam at 1873 K (1600 °C) were studied by thermodynamic simulation (using Thermodynamic Package FactSage 7.0) and laboratory experiments. The thermodynamic calculation showed that, upon increasing slag basicity (CaO/SiO 2 ) from 1.0 to 2.5, for the reaction of 100 g of slags with 100 g of H 2 O gas, the accumulated amount of the produced H 2 gas increased from 0.17 to 0.27 g, while the amount of magnetic spinel phase first increased and then decreased, with the maximum precipitation of 16.71 g at the basicity of 1.5. When the FeO concentration increased from 15 to 30 pct for the slag with basicity of 2.0, the accumulated amount of the produced H 2 gas increased from 0.17 to 0.28 g, and the amount of magnetic spinel phase increased from 5.88 to 10.59 g. The laboratory experiments were conducted in confocal laser scanning microscope to verify the reaction between 0.2 g of slag and 3.75 L of H 2 O-Ar gas (PH2O=0.2atm). The results indicated that, for 100 g of slags, upon increasing slag basicity (CaO/SiO 2 ) from 1.0 to 2.5, both the produced H 2 gas and magnetic spinel phase first increased and then decreased, with the maximum amounts being 0.09 g of gas and 37.00 g of magnetic spinel phase at the slag basicity of 1.50. For the FeO concentration increasing from 15 to 30 pct, the amounts of both the produced H 2 gas and magnetic spinel phase increased from 0.04 to 0.10 g and from 18.00 to 27.00 g, respectively. The reaction rate between the molten CaO-SiO 2 -FeO-MnO-Al 2 O 3 -MgO slag and the moisture (PH2O=0.2atm) increased with the increasing FeO activity in the slag. The dependence of the reaction rate (mol/cm 2 /s) on FeO content can be expressed as r=(7.67(aFeO)-2.99)×10-7.
AB - In this paper, the effects of slag composition (slag basicity CaO/SiO 2 and FeO concentration) on the amounts of H 2 gas generated and the magnetic spinel phase precipitated as a result of the reaction between synthetic steelmaking slag and steam at 1873 K (1600 °C) were studied by thermodynamic simulation (using Thermodynamic Package FactSage 7.0) and laboratory experiments. The thermodynamic calculation showed that, upon increasing slag basicity (CaO/SiO 2 ) from 1.0 to 2.5, for the reaction of 100 g of slags with 100 g of H 2 O gas, the accumulated amount of the produced H 2 gas increased from 0.17 to 0.27 g, while the amount of magnetic spinel phase first increased and then decreased, with the maximum precipitation of 16.71 g at the basicity of 1.5. When the FeO concentration increased from 15 to 30 pct for the slag with basicity of 2.0, the accumulated amount of the produced H 2 gas increased from 0.17 to 0.28 g, and the amount of magnetic spinel phase increased from 5.88 to 10.59 g. The laboratory experiments were conducted in confocal laser scanning microscope to verify the reaction between 0.2 g of slag and 3.75 L of H 2 O-Ar gas (PH2O=0.2atm). The results indicated that, for 100 g of slags, upon increasing slag basicity (CaO/SiO 2 ) from 1.0 to 2.5, both the produced H 2 gas and magnetic spinel phase first increased and then decreased, with the maximum amounts being 0.09 g of gas and 37.00 g of magnetic spinel phase at the slag basicity of 1.50. For the FeO concentration increasing from 15 to 30 pct, the amounts of both the produced H 2 gas and magnetic spinel phase increased from 0.04 to 0.10 g and from 18.00 to 27.00 g, respectively. The reaction rate between the molten CaO-SiO 2 -FeO-MnO-Al 2 O 3 -MgO slag and the moisture (PH2O=0.2atm) increased with the increasing FeO activity in the slag. The dependence of the reaction rate (mol/cm 2 /s) on FeO content can be expressed as r=(7.67(aFeO)-2.99)×10-7.
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U2 - 10.1007/s11663-019-01533-z
DO - 10.1007/s11663-019-01533-z
M3 - Article
AN - SCOPUS:85061732296
SN - 1073-5615
VL - 50
SP - 1023
EP - 1034
JO - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
JF - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
IS - 2
ER -