LI Hong, FENG Jia, LI Yong-qing, GUO Luo-fang, SONG Wen-chen. Thermodynamic analysis of limestone decomposition and CO2 oxidation effect in the early stage of BOF steelmaking[J]. Chinese Journal of Engineering, 2011, 33(S1): 83-87. DOI: 10.13374/j.issn1001-053x.2011.s1.021
Citation: LI Hong, FENG Jia, LI Yong-qing, GUO Luo-fang, SONG Wen-chen. Thermodynamic analysis of limestone decomposition and CO2 oxidation effect in the early stage of BOF steelmaking[J]. Chinese Journal of Engineering, 2011, 33(S1): 83-87. DOI: 10.13374/j.issn1001-053x.2011.s1.021

Thermodynamic analysis of limestone decomposition and CO2 oxidation effect in the early stage of BOF steelmaking

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  • Received Date: August 02, 2011
  • Available Online: July 29, 2021
  • The computational formulas of CO2 partial pressure pCO2 and[C] activity coefficient fC,% under the condition of high carbon concentration and low temperature were derived from the analysis of limestone decomposition and CO2 oxidation in the early stage of BOF steelmaking by the thermodynamic method. It is shown that the equilibrium decomposition reaction temperature of calcium carbonate in limestone near the surface of molten iron with high carbon concentration and low temperature is much lower than that under the standard state. The reaction tendency of limestone decomposition increases as the furnace temperature rises,and the reactions of CO2 with[C],[Si],[Mn]as well as Fe(l) can occur spontaneously as the same reaction sequence of oxidation by O2 in the early stage. The value of pCO2 under the condition of high carbon concentration and low temperature is very small,near the value of 0.002 2 to 0.000 5pΘ in the early stage of BOF steelmaking,so all of the CO2 produced from the limestone decomposition reaction can be thought to participate in the oxidation reaction of molten iron.
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