Abstract
A thermodynamic model for seven CaO-MgO-BaO-CaF2-SiO2-Al2O3-TiO2 ladle slags based on the Ion and Molecule Coexistence theory (IMCT) is establishment and validated by the experiment results at 1873K. The calculated activity of SiO2, Al2O3 and TiO2 in the slag can be approved by the experiment results and the IMCT model used in this study is reasonable. Then the influence factors such as the mass ratio of CaO to SiO2 (C/S ratio) ranging from 1 to 10, the mass ratio of CaO to Al2O3 (C/A ratio) ranging from 1 to 2.5, TiO2 content (wt pct) ranging from 0 to 30, BaO content (wt pct) ranging from 0 to 30 are investigated based on the thermodynamic calculating results. The raise of C/S ratio, TiO2 content and BaO content in the slag can increase the molar Gibbs energy change (ΔG) of Ti reacted with SiO2 and Al2O3 or Al reacted with SiO2. The effect of C/A ratio on the molar Gibbs energy change (ΔG) of Ti reacted with SiO2 and Al2O3 or Al reacted with SiO2 was less. Finally, the slag with higher C/S ratio and TiO2 content and appropriate BaO content can weaken the reaction between Ti and SiO2 or Al2O3 in the slag.
Highlights
TiC and TiN inclusion can be formed in the Ti bearing steel in the solidification process (Cavazos et al, 2011; Leban and Tisu, 2013), which can increase the strength of the final products, as the steel’s secondary phase (Huang et al, 2018)
Due to the adding of BaO in the ladle slag has a excellently ability for desulphurization (Gao et al, 2012), this study is mainly focused on the investigation of the reactive between CaO-SiO2-MgO-Al2O3-TiO2-CaF2-BaO slag and 0.361% Ti bearing steel (0.0361%Al) by use the thermodynamic model (IMCT model), which is needed to be approved by the experiment results
1) According to the comparing results between thermodynamic calculation and experimental values, the Ion and Molecule Coexistence theory (IMCT) model established in this paper is reasonable
Summary
TiC and TiN inclusion can be formed in the Ti bearing steel in the solidification process (Cavazos et al, 2011; Leban and Tisu, 2013), which can increase the strength of the final products, as the steel’s secondary phase (Huang et al, 2018). According to the previous researches (Qian et al, 2014; Jiang et al, 2016; Li and Cheng, 2019), The IMCT model has been applied in CaO-SiO2-MgO-Al2O3-TiO2-CaF2 slag system successfully for Ti-bearing stainless steel and 825 alloy refining process. Due to the adding of BaO in the ladle slag has a excellently ability for desulphurization (Gao et al, 2012), this study is mainly focused on the investigation of the reactive between CaO-SiO2-MgO-Al2O3-TiO2-CaF2-BaO slag and 0.361% Ti bearing steel (0.0361%Al) by use the thermodynamic model (IMCT model), which is needed to be approved by the experiment results. N1 n1/ ni N2 n2/ ni N3 n3/ ni N4 n4/ ni N5 n5/ ni N6 n6/ ni N7 n7/ ni N8 n8/ ni N9 n9/ ni N10 n10/ ni N11 n11/ ni N12 n12/ ni N13 n13/ ni N14 n14/ ni N15 n15/ ni N16 n16/ ni N17 n17/ ni N18 n18/ ni N19 n19/ ni N20 n20/ ni N21 n21/ ni N22 n22/ ni N23 n23/ ni N24 n24/ ni N25 n25/ ni N26 n26/ ni N27 n27/ ni N28 n28/ ni N29 n29/ ni N30 n30/ ni N31 n31/ ni N32 n32/ ni N33 n33/ ni N34 n34/ ni N35 n35/ ni N36 n36/ ni N37 n37/ ni N38 n38/ ni N39 n39/ ni N40 n40/ ni N41 n41/ ni N42 n42/ ni N43 n43/ ni N44 n44/ ni N45 n45/ ni N46 n46/ ni N47 n47/ ni N48 n48/ ni N49 n49/ ni N50 n50/ ni N51 n51/ ni N52 n52/ ni N53 n53/ ni N54 n54/ ni N55 n55/ ni N56 n56/ ni N57 n57/ ni N58 n58/ ni TABLE 5 | The chemical reaction formulas of complex molecular in this model, and their Standard Molar Gibbs Free Energy Changes and Mass Action Concentrations of complex molecules expressed by Ki
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