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Prediction model of sulphur distribution ratio between CaO-FeO-Fe2O3-Al2O3-P2O5 slags and liquid iron over large variation range of oxygen potential during secondary refining process of molten steel based on ion and molecule coexistence theory
Yang, X. M.1; Li, J. Y.1,2; Zhang, M.1,3; Zhang, J.2
2016
Source PublicationIRONMAKING & STEELMAKING
ISSN0301-9233
Volume43Issue:1Pages:39-55
Abstract

A thermodynamic model for predicting sulphur distribution ratio LS between CaO-FeO-Fe2O3Al2O3-P2O5 slags and liquid iron, i.e. the ion and molecule coexistence theory (IMCT)-L-S model, has been developed for slags in a large variation range of slag oxidisation ability based on the IMCT. The developed IMCT-LS model has been verified with measured data of oxygen, phosphorus and sulphur distribution equilibria berween the slags and liquid irpn from the literature. The results indicate that the desulphurisation reaction is mainly controlled by reaction (CaO)+ [S] = (CaS) + [O] in the reducing zone with the optimised standard molar Gibbs free energy change of Delta(r)G(m,cas)(Theta)= 147023.63-227.94T (J mol(-1) ); the desulphurisation reaction is dominated by reaction (FeO) + [S] = (FeS) + [O] in the oxidising zone with the reported standard molar Gibbs free energy change of Delta(r)G(m,Fas)(Theta) = 115526 - 33.35T (J mol(-1)). The influence of CaO on the desulphurisation ability of the slags can be counteracted by that of FeO because higher CaO content corresponds to lower FeO content in the slags. An asymmetric V type relationship between sulphur distribution ratio L-S and the mass action concentration ratio N-Fe2O3/NCaO or N-Fe2O3.Fe2O3/NCaO or N-FeO/N-CaO, or the mass percentage ratio (% FeO)/(% CaO) or (% Fe2O3)/(% CaO) or (% FeO)/(% CaO) or the simplified complex basicity (% CaO)/[(% Al2O3) + (% P2O5)] or optical basicity can be established for the slags equilibrated with liquid iron in a temperature range from 1811 to 1927K (1538 to 16548 degrees C). The abovementioned mass action concentration ratios or mass percentage ratios of various iron oxides to basic oxide CaO can be recommended to represent the comprehensive effect of iron oxides Fe-O and basic oxide CaO on desulphurisation ability of the slags.

KeywordSulphur Distribution Ratio Desulphurisation Reaction Mechanism Cao-feo-fe2o3-al2o3-p2o5 Slags Thermodynamic Model Mass Action Concentration Ion And Molecule Coexistence Theory Structural Units Ion Couples Oxygen Potential Secondary Refining Of Molten Steel
SubtypeArticle
Subject AreaMetallurgy & Metallurgical Engineering ; Metallurgy & Metallurgical Engineering
WOS HeadingsScience & Technology ; Technology
DOI10.1179/1743281215Y.0000000047
URL查看原文
Indexed BySCI
Language英语
WOS KeywordFeto-(cao+mgo)-(sio2+p2o5) Phosphate Slags ; Cao-sio2-mgo-al2o3 Ironmaking Slags ; Blast-furnace Slags ; Lime-based Flux ; Sulfide Capacities ; Hot Metal ; Pig-iron ; Soda Ash ; Simultaneous Dephosphorization ; Simultaneous Desulfurization
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China (NSFC)(51174186)
WOS IDWOS:000369983200006
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/20696
Collection研究所(批量导入)
Corresponding AuthorYang, X. M.
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China
3.China Met Grp Corp, Beijing Met Equipment Res Design & Inst Co Ltd, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Yang, X. M.,Li, J. Y.,Zhang, M.,et al. Prediction model of sulphur distribution ratio between CaO-FeO-Fe2O3-Al2O3-P2O5 slags and liquid iron over large variation range of oxygen potential during secondary refining process of molten steel based on ion and molecule coexistence theory[J]. IRONMAKING & STEELMAKING,2016,43(1):39-55.
APA Yang, X. M.,Li, J. Y.,Zhang, M.,&Zhang, J..(2016).Prediction model of sulphur distribution ratio between CaO-FeO-Fe2O3-Al2O3-P2O5 slags and liquid iron over large variation range of oxygen potential during secondary refining process of molten steel based on ion and molecule coexistence theory.IRONMAKING & STEELMAKING,43(1),39-55.
MLA Yang, X. M.,et al."Prediction model of sulphur distribution ratio between CaO-FeO-Fe2O3-Al2O3-P2O5 slags and liquid iron over large variation range of oxygen potential during secondary refining process of molten steel based on ion and molecule coexistence theory".IRONMAKING & STEELMAKING 43.1(2016):39-55.
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