LAPSE:2024.0169
Published Article
LAPSE:2024.0169
The Kinetic Mechanism of the Thermal Decomposition Reaction of Small Particles of Limestone at Steelmaking Temperatures
February 10, 2024
Converter blowing limestone powder making slag steelmaking process has the advantages of low carbon and high efficiency, and can realize the resource utilization of CO2 in the metallurgical process, which is in line with the development direction of green metallurgy. Based on a thermogravimetric-differential thermal analyzer, the kinetic mechanism of decomposition of small limestone at steelmaking temperatures was investigated by a modified double extrapolation method. The results showed that with a higher rate of heating, limestone decomposition lagged, and decomposition temperature increased. Furthermore, the smaller the limestone particle size, the lower the activation energy of decomposition. Compared with N2, air, and O2, small limestone powder used for converter blowing could complete more rapid decomposition, and the time required for decomposition shortened by about 1/3, although the decomposition temperature increased in the CO2. The limestone decomposition rate increased and then decreased at low to high CO2 partial pressures. With a limiting link, the inhibition was more significant under high CO2 partial pressure, but the reaction can be fully completed by 1000 °C. The decomposition type modeled was stochastic nucleation and subsequent growth. As the partial pressure of CO2 increased from 25% to 100%, the number of reaction stages, n, increased.
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Keywords
carbon dioxide partial pressure, converter steelmaking, decomposition kinetics, low carbon, small-particle limestone
Subject
Suggested Citation
Li C, Zhang Y, Xue Y, Zhang K, Wang S, Sun H, Xie H. The Kinetic Mechanism of the Thermal Decomposition Reaction of Small Particles of Limestone at Steelmaking Temperatures. (2024). LAPSE:2024.0169
Author Affiliations
Li C: Metallurgy and Energy College, North China University of Science and Technology, Tangshan 063210, China
Zhang Y: Metallurgy and Energy College, North China University of Science and Technology, Tangshan 063210, China [ORCID]
Xue Y: Metallurgy and Energy College, North China University of Science and Technology, Tangshan 063210, China
Zhang K: Metallurgy and Energy College, North China University of Science and Technology, Tangshan 063210, China
Wang S: Metallurgy and Energy College, North China University of Science and Technology, Tangshan 063210, China
Sun H: Metallurgy and Energy College, North China University of Science and Technology, Tangshan 063210, China
Xie H: School of Metallurgy, Northeastern University, Shenyang 110819, China
Zhang Y: Metallurgy and Energy College, North China University of Science and Technology, Tangshan 063210, China [ORCID]
Xue Y: Metallurgy and Energy College, North China University of Science and Technology, Tangshan 063210, China
Zhang K: Metallurgy and Energy College, North China University of Science and Technology, Tangshan 063210, China
Wang S: Metallurgy and Energy College, North China University of Science and Technology, Tangshan 063210, China
Sun H: Metallurgy and Energy College, North China University of Science and Technology, Tangshan 063210, China
Xie H: School of Metallurgy, Northeastern University, Shenyang 110819, China
Journal Name
Processes
Volume
11
Issue
9
First Page
2712
Year
2023
Publication Date
2023-09-11
ISSN
2227-9717
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Original Submission
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PII: pr11092712, Publication Type: Journal Article
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Published Article
LAPSE:2024.0169
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https://doi.org/10.3390/pr11092712
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[v1] (Original Submission)
Feb 10, 2024
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Feb 10, 2024
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Record Owner
Calvin Tsay
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