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A Thermodynamic Model of Sulfur Distribution Ratio between CaO-SiO2-MgO-FeO-MnO-Al2O3 Slags and Molten Steel during LF Refining Process Based on the Ion and Molecule Coexistence Theory
Yang, Xue-Min1; Shi, Cheng-Bin2,3; Zhang, Meng2,3; Chai, Guo-Ming2,3; Wang, Fei2,3; Yang, XM
2011-12-01
Source PublicationMETALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
ISSN1073-5615
Volume42Issue:6Pages:1150-1180
AbstractA thermodynamic model for calculating the sulfur distribution ratio between ladle furnace (LF) refining slags and molten steel has been developed by coupling with a developed thermodynamic model for calculating the mass action concentrations of structural units in LF refining slags, i.e., CaO-SiO2-MgO-FeO-MnO-Al2O3 hexabasic slags, based on the ion and molecule coexistence theory (IMCT). The calculated mass action concentrations of structural units in CaO-SiO2-MgO-FeO-Al2O3-MnO slags equilibrated or reacted with molten steel show that the calculated equilibrium mole numbers or mass action concentrations of structural units or ion couples, rather than mass percentage of components, in the slags can represent their reaction abilities. The calculated total sulfur distribution ratio shows a reliable agreement with the measured or the calculated sulfur distribution ratio between the slags and molten steel by other models under the condition of choosing oxygen activity based on (FeO)-[O] equilibrium. Meanwhile, the developed thermodynamic model for calculating sulfur distribution ratio can quantitatively determine the respective contribution of free CaO, MgO, FeO, and MnO in the LF refining slags. A significant difference of desulfurization ability among free component as CaO, MgO, FeO, and MnO has been found with approximately 87-93 pct, 11.43-5.85 pct, 0.81-0.60 pct and 0.30-0.27 pct at both middle and final stages during LF refining process, respectively. A large difference of oxygen activity is found in molten steel at the slag-metal interface and in bulk molten steel. The oxygen activity in molten steel at the slag-metal interface is controlled by (FeO)-[O] equilibrium, whereas the oxygen activity in bulk molten steel is controlled by [Al]-[O] equilibrium. Decreasing the high-oxygen-activity boundary layer beneath the slag-metal interface can promote the desulfurization reaction rate effectively or shorten the refining period during the LF refining process.
KeywordCao-sio2-mgo-al2o3 Ironmaking Slags Mass-action Law Sulfide Capacities Liquid-iron Hot Metal Ladle Furnace Temperature Prediction Activity-coefficients Desulfurization Optimization
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1007/s11663-011-9547-9
Indexed BySCI
Language英语
WOS KeywordCAO-SIO2-MGO-AL2O3 IRONMAKING SLAGS ; MASS-ACTION LAW ; SULFIDE CAPACITIES ; LIQUID-IRON ; HOT METAL ; LADLE FURNACE ; TEMPERATURE PREDICTION ; ACTIVITY-COEFFICIENTS ; DESULFURIZATION ; OPTIMIZATION
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000297251700015
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/4350
Collection多相复杂系统国家重点实验室
Corresponding AuthorYang, XM
Affiliation1.Chinese Acad Sci, State Key Lab Multiphase Complex Syst, Inst Proc Engn, Beijing 100190, Peoples R China
2.Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China
3.Chinese Acad Sci, Inst Proc Engn, Beijing 100864, Peoples R China
Recommended Citation
GB/T 7714
Yang, Xue-Min,Shi, Cheng-Bin,Zhang, Meng,et al. A Thermodynamic Model of Sulfur Distribution Ratio between CaO-SiO2-MgO-FeO-MnO-Al2O3 Slags and Molten Steel during LF Refining Process Based on the Ion and Molecule Coexistence Theory[J]. METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE,2011,42(6):1150-1180.
APA Yang, Xue-Min,Shi, Cheng-Bin,Zhang, Meng,Chai, Guo-Ming,Wang, Fei,&Yang, XM.(2011).A Thermodynamic Model of Sulfur Distribution Ratio between CaO-SiO2-MgO-FeO-MnO-Al2O3 Slags and Molten Steel during LF Refining Process Based on the Ion and Molecule Coexistence Theory.METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE,42(6),1150-1180.
MLA Yang, Xue-Min,et al."A Thermodynamic Model of Sulfur Distribution Ratio between CaO-SiO2-MgO-FeO-MnO-Al2O3 Slags and Molten Steel during LF Refining Process Based on the Ion and Molecule Coexistence Theory".METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE 42.6(2011):1150-1180.
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