Thermodynamic models for predicting dephosphorisation ability and potential of CaO-FeO-Fe2O3-Al2O3-P2O5 slags during secondary refining process of molten steel based on ion and molecule coexistence theory
Yang, X. M.1; Zhang, M.1,2; Chai, G. M.1,3; Li, J. Y.1,4; Liang, Q.1,5; Zhang, J.4
2016
发表期刊IRONMAKING & STEELMAKING
ISSN0301-9233
卷号43期号:9页码:663-687
摘要

Thermodynamic models for predicting phosphorus distribution ratio L-P and phosphate capacity CPO43- of CaO-FeO-Fe2O3-Al2O3-P2O5 slags during secondary refining process of molten steel, according to the ion and molecule coexistence theory (IMCT), i.e. IMCT-L-P and IMCT-CPO43- models, have been developed by coupling with the developed thermodynamic model for calculating the mass action concentrations N-i of structural units or ion couples in the slags, i.e. the IMCT-N-i model, based on the IMCT. The developed IMCT-L-P and IMCT-CPO43- models have been verified with the experimental results from the literature and the predicted results by the summarised five L-P models and three CPO43- models. Besides the total dephosphorisation ability and potential of the slags as L-P and CPO43-, the respective phosphorus distribution ratio L-P,(i) and the respective phosphate capacity CPO43-; i of six dephosphorisation products as P2O5, 3FeO center dot P2O5, 4FeO center dot P2O5, 2CaO center dot P2O5, 3CaO center dot P2O5 and 4CaO center dot P2O5 can also reliably be predicted by the developed IMCT-L-P and IMCT-CPO43- models. 3CaO center dot P2O5 accounts for 95.00% of dephosphorisation products compared with 5% for 4CaO center dot P2O5. The comprehensive effect of CaO + FetO, which can be described by the mass action concentration ratio N-FetO/N-CaO, controls dephosphorisation ability and potential of the slags. An exponentially growing relationship of lg L-P against slag oxidisation ability and slag basicity as the simplified complex basicity (% CaO)/[(%P2O5) + (% Al2O3)] or optical basicity can be established for the slags in a temperature range from 1811 to 1927 K. However, a linearly increasing relationship of lg CPO43- against slag oxidisation ability and the aforementioned two kinds of slag basicity can be correlated for the slags in the lower temperature range from 1811 to 1828 K and the middle temperature range from 1870 to 1876 K; an inversely asymmetrical U type relationship of lg CPO43- against the aforementioned parameters can be observed for the slags in the higher temperature range from 1918 to 1927 K. The influences of the aforementioned parameters on dephosphorisation ability are significantly different from those on dephosphorisation potential of the slags.

关键词Phosphorus Distribution Ratio Phosphate Capacity Dephosphorisation Mechanism Thermodynamic Model Cao-feo-fe2o3-al2o3-p2o5 Slags Ion And Molecule Coexistence Theory Secondary Refining Of Molten Steel Mass Action Concentration Structural Units Ion Couples Slag Oxidation Ability Feto Activity
文章类型Article
WOS标题词Science & Technology ; Technology
DOI10.1179/1743281215Y.0000000032
收录类别SCI
语种英语
关键词[WOS]FETO-(CAO+MGO)-(SIO2+P2O5) PHOSPHATE SLAGS ; CAO-SIO2-MGO-AL2O3 IRONMAKING SLAGS ; BINARY-LIQUID ALLOYS ; LIME-BASED FLUX ; HOT METAL ; PHOSPHORUS DISTRIBUTION ; PIG-IRON ; SODA ASH ; SIMULTANEOUS DESULFURIZATION ; DISTRIBUTION EQUILIBRIA
WOS研究方向Metallurgy & Metallurgical Engineering
WOS类目Metallurgy & Metallurgical Engineering
项目资助者National Natural Science Foundation of China (NSFC)(51174186)
WOS记录号WOS:000386493200006
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/21592
专题湿法冶金清洁生产技术国家工程实验室
作者单位1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.China Met Grp Corp, Beijing Met Equipment Res Design & Inst Co Ltd, Beijing 100029, Peoples R China
3.Shanxi Taigang Stainless Steel Corp Ltd, Steelmaking Steel Plant 2, Taiyuan 030003, Peoples R China
4.Univ Sci & Technol, Sch Met & Ecol Engn, Beijing 100083, Peoples R China
5.Cent Iron & Steel Res Inst, Met Technol Inst, Beijing 100081, Peoples R China
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GB/T 7714
Yang, X. M.,Zhang, M.,Chai, G. M.,et al. Thermodynamic models for predicting dephosphorisation ability and potential of CaO-FeO-Fe2O3-Al2O3-P2O5 slags during secondary refining process of molten steel based on ion and molecule coexistence theory[J]. IRONMAKING & STEELMAKING,2016,43(9):663-687.
APA Yang, X. M.,Zhang, M.,Chai, G. M.,Li, J. Y.,Liang, Q.,&Zhang, J..(2016).Thermodynamic models for predicting dephosphorisation ability and potential of CaO-FeO-Fe2O3-Al2O3-P2O5 slags during secondary refining process of molten steel based on ion and molecule coexistence theory.IRONMAKING & STEELMAKING,43(9),663-687.
MLA Yang, X. M.,et al."Thermodynamic models for predicting dephosphorisation ability and potential of CaO-FeO-Fe2O3-Al2O3-P2O5 slags during secondary refining process of molten steel based on ion and molecule coexistence theory".IRONMAKING & STEELMAKING 43.9(2016):663-687.
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