Prediction Model of Sulfide Capacity for CaO-FeO-Fe2O3-Al2O3-P2O5 Slags in a Large Variation Range of Oxygen Potential Based on the Ion and Molecule Coexistence Theory

The coupling relationships between dephosphorization and desulfurization abilities or potentials for CaO–FeO–Fe2O3–Al2O3–P2O5 slags over a large variation range of slag oxidization ability during the secondary refining process of molten steel have been proposed by the present authors as logLp + 5logLs or logCpo3-4 + logCs2- in the reducing zone and as logLp + logLs - 5logNFetO or logCPO3-4 + logCs2- in the oxidizing zone based on the ion and molecule coexistence theory (IMCT). In order to further verify the validation and feasibility of the proposed coupling relationships, the effects of chemical composition of the CaO-based slags are provided. The chemical composition of slags was described by three group parameters including reaction abilities of components represented by the mass action concentrations Ni , two kinds of slag basicity as simplified complex basicity and optical basicity , and the comprehensive effect of iron oxides FetO and basic oxide CaO. Comparing with the strong effects of chemical composition of the CaO-based slags on dephosphorization and desulfurization abilities or potentials, the proposed coupling relationships have been confirmed to not only be independent of slag oxidization ability as expected but also irrelevant to the aforementioned three groups of parameters for representing the chemical composition of the CaO-based slags. Increasing temperature from 1811 to 1927 K (1538 to 1654 °C) can result in a decreasing tendency of the proposed coupling relationships. In terms of the proposed coupling relationships, chemical composition of slags or fluxes with assigned dephosphorization ability or potential can be theoretically designed or optimized from its desulfurization ability or potential, and vice versa. Considering the large difference of magnitude between phosphate capacity CPO3-4 and sulfide capacity CS2- , the proposed coupling relationships between dephosphorization and desulfurization abilities for CaO-based slags are recommended to design or optimize chemical composition of slags.

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A Sulfide Capacity Prediction Model of CaO-SiO2-MgO-FeO-MnO-Al2O3 Slags during the LF Refining Process Based on the Ion and Molecule Coexistence Theory

Metallurgical and Materials Transactions B ◽

10.1007/s11663-011-9612-4 ◽

2011 ◽

Vol 43 (2) ◽

pp. 241-266 ◽

Cited By ~ 19

Author(s):

Xue-Min Yang ◽

Meng Zhang ◽

Cheng-Bin Shi ◽

Guo-Ming Chai ◽

Jian Zhang

Keyword(s):

Prediction Model ◽

Sulfide Capacity ◽

Refining Process ◽

Coexistence Theory ◽

Lf Refining ◽

Capacity Prediction

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The Slagging Model Research of Refining-Slag for High Aluminum Steel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.602-604.90 ◽

2012 ◽

Vol 602-604 ◽

pp. 90-95

Author(s):

Min Zhang ◽

Jian Hua Zeng ◽

Xing Di Yang ◽

Yao Xian Zeng

Keyword(s):

Prediction Model ◽

Reduction Reaction ◽

Refining Slag ◽

Activity Prediction ◽

Slag Refining ◽

Coexistence Theory ◽

Model Research ◽

High Aluminum Steel ◽

Si Content ◽

High Aluminum

To accurately control the Si content and ensure the function of slag refining in high aluminum steel, the direction and limits of reduction reaction for SiO2 were analyzed based on the thermodynamics. In addition, the thermodynamic prediction model of multi-element slag was studied. Then, a slag activity prediction model was established based on the coexistence theory. Using the model, the suitable ladle slag composition for high aluminum steel was calculated.

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A Sulphide Capacity Prediction Model of CaO–SiO2–MgO–Al2O3 Ironmaking Slags Based on the Ion and Molecule Coexistence Theory

ISIJ International ◽

10.2355/isijinternational.50.1362 ◽

2010 ◽

Vol 50 (10) ◽

pp. 1362-1372 ◽

Cited By ~ 48

Author(s):

Cheng-bin Shi ◽

Xue-min Yang ◽

Jin-sha Jiao ◽

Chuang Li ◽

Han-jie Guo

Keyword(s):

Prediction Model ◽

Coexistence Theory ◽

Capacity Prediction

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A SULPHIDE CAPACITY PREDICTION MODEL OF BLAST FURNACE SLAG

Materiali in tehnologije ◽

10.17222/mit.2021.157 ◽

2021 ◽

Vol 55 (5) ◽

Author(s):

Yongchun Guo ◽

Shen Fengman ◽

Haiyan Zheng ◽

Shuo Wang ◽

Xin Jiang ◽

...

Keyword(s):

Blast Furnace ◽

Theoretical Model ◽

Prediction Model ◽

Linear Relationship ◽

Blast Furnace Slag ◽

Slag System ◽

Good Linear ◽

Coexistence Theory ◽

Furnace Slag ◽

Capacity Prediction

A sulphide capacity prediction model of CaO-SiO2-MgO-Al2O3 slags has been developed based on the ion and molecule coexistence theory(IMCT). Sulphide capacity(Cs) of slag for blast furnace (BF) with high Al2O3 in the CaO-SiO2-MgO-Al2O3 system at 1773K were measured by applying slag-metal equilibrium method. The feasibility of the developed IMCT model is verified by the sulphide capacity measured in the experiment. Effects of R(w(CaO)/w(SiO2)), w(MgO)/w(Al2O3) and w(Al2O3) on sulphide capacity were discussed. There is a good linear relationship between the experimental value and the predicted value. Therefore, the theoretical model of ion and molecule coexistence can be used to calculate the sulphide capacity of CaO-SiO2-MgO-Al2O3 quaternary slag system. When w(Al2O3)=20% and w(MgO)/w(Al2O3)=0.5, the sulphide capacity of slag increased with the increase of R. When w(Al2O3)=20% and R=1.30, the sulphide capacity of slag increased with the increase of w(MgO)/w(Al2O3). When R=1.30 and w(MgO)/w(Al2O3)=0.4, the sulphide capacity of slag decreased with the increase of w(Al2O3).

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