Study of Thermodynamic for Low-Reactive CaO-BaO-Al2O3-SiO2-CaF2-Li2O Mold Flux Based on the Model of Ion and Molecular Coexistence Theory

Zhao, Maoguo; Li, Gang; Li, Zhirong; Wang, Qiangqiang; He, Shengping

doi:10.3390/met12071099

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…Typically, slag is formed in many processes [99][100][101][102][103][104][105][106][107]; for example, ironmaking, convertor steelmaking, refining, continuous casting, the electroslag remelting process, and ferroalloys production. The thermodynamic properties and physicochemical properties of many types of slags have been widely evaluated and modeled [108][109][110][111][112][113][114]. Typical refining slags are CaO-Al 2 O 3 -SiO 2 slag and CaO-SiO 2 -Al 2 O 3 -MgO slag systems.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Inclusion Removal Ability in Refining Slags Containing Ce2O3

Cao

Wang

et al. 2023

Crystals

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The elimination of inclusions in steelmaking processes has been widely studied. The removal of inclusions by slags containing the rare earth oxide Ce2O3 are studied using an integrated numerical model. The integrated model involves the inclusion motion model, interfacial tension calculation model, surface tension calculation model of slag, and the mass action concentration model, based on ion and molecule coexistence theory. The motion behaviors of both solid Al2O3 inclusions and 50%wtAl2O3–50%wtCaO liquid inclusions of varied sizes at CaO-Ce2O3-SiO2-Al2O3(-MgO) slag systems are evaluated. The results show that it is more difficult to remove the inclusions with smaller sizes and in slag with a higher viscosity. Liquid inclusions are more difficult to remove than solid inclusions. It is found that the CaO-Ce2O3-SiO2-Al2O3-MgO refining slag shows a better ability to remove Al2O3 inclusions than that of the CaO-SiO2-Al2O3-MgO slag. The reason for this is that the addition of the rare earth oxide Ce2O3 can decrease the viscosity of slags, as well as improving the wetting effects of slags on Al2O3 inclusions. For two slags systems, the CaO-Ce2O3-SiO2-Al2O3-MgO slag system shows a better ability to remove Al2O3 inclusions than the CaO-Ce2O3-SiO2-Al2O3 slag system. The addition of 5% to 8% Ce2O3 in a CaO-SiO2-Al2O3-MgO slag is an optimized case for industrial applications.

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Section: Introductionmentioning

confidence: 99%

Assessment of Inclusion Removal Ability in Refining Slags Containing Ce2O3

Cao

Wang

et al. 2023

Crystals

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“…Therefore, establishing a calculation model for the activity of CaO-Al2O3-SiO2-MgO quaternary slag components and predicting the activity of related components are of great significance for further research on the mechanical properties of refining slag based geopolymers. So far, many slag thermodynamic models have been proposed, such as the Regular Solution Model(RSM) 10 , ion model 11 , Wilson equation 12 , the new generation of solution geometric model 13 , KTH model 14 , molecular interaction volume model (MIVM) 15 , Monte Carlo model 16 , Aggregation model 17 , molecular ion coexistence theoretical model 18 , etc. However, most prediction models involve manually defined parameters and have limited scope of application.…”

Section: Introductionmentioning

confidence: 99%

Prediction model for SiO2 activity in the CaO-Al2O3-SiO2-MgO quaternary slag system

Lin

Fang

et al. 2022

Preprint

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Activity models based on the ion and molecule coexistence theory have been widely used in the refining of metallurgical slags, with the SiO2 content of slag playing a crucial role in improving the mechanical properties of refining slag-based cementitious materials. In order to improve the reactivity of SiO2 in slag, this study established a SiO2 activity prediction model for the CaO-Al2O3-SiO2-MgO quaternary slag system based on the ion and molecule coexistence theory, validating the prediction results using reference values from the literature. Following this, the effects of w(SiO2), w(CaO), w(CaO)/w(Al2O3) and R(w(CaO)/w(SiO2)) on SiO2 activity, were explored (where w and R represent content and alkalinity, respectively). The results show that the model could accurately predict the SiO2 activity of refining slag. When the SiO2 content was increased from 10–30%, with 60% w(CaO) and a w(MgO)/w(Al2O3) ratio of 0.25, the SiO2 activity exhibited a trend of initially increasing and then decreasing, with a maximum activity value of 0.1359 reached at 17.5% w(SiO2). When slag contained 15% w(SiO2) and a w(MgO)/w(Al2O3) ratio of 0.25, the SiO2 activity decreased with increasing CaO content, reaching a maximum activity value of 0.1268 when 55% w(CaO) was present. Therefore, by controlling the ratio of w(CaO)/w(Al2O3) and w(CaO)/w(SiO2) in the slag to maintain a ratio of 3, the activity of SiO2 can be effectively increased.

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Prediction Model for SiO2 Activity in the CaO-Al2O3-SiO2-MgO Quaternary Slag System

Lin

Fang

et al. 2023

Minerals

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Activity models based on the ion and molecule coexistence theory have been widely used in the refining of metallurgical slags, with the SiO2 content of slag playing a crucial role in improving the mechanical properties of refining slag-based cementitious materials. In order to improve the reactivity of SiO2 in slag, this study established a SiO2 activity prediction model for the CaO-Al2O3-SiO2-MgO quaternary slag system based on the ion and molecule coexistence theory, validating the prediction results using reference values from the literature. Following this, the effects of w(SiO2), w(CaO), w(CaO)/w(Al2O3), and R(w(CaO)/w(SiO2)) on SiO2 activity were explored (where w and R represent content and alkalinity, respectively). The results show that the model could accurately predict the SiO2 activity of refining slag at 1873k. When the SiO2 content was increased from 10% to 30%, with 60% w(CaO) and a w(MgO)/w(Al2O3) ratio of 0.25, the SiO2 activity exhibited a trend of initially increasing and then decreasing, with a maximum activity value of 0.1359 reached at 17.5% w(SiO2). When slag contained 15% w(SiO2) and a w(MgO)/w(Al2O3) ratio of 0.25, the SiO2 activity decreased with increasing CaO content, reaching a maximum activity value of 0.1268 when 55% w(CaO) was present. Therefore, by controlling the ratio of w(CaO)/w(Al2O3) and w(CaO)/w(SiO2) in the slag to maintain a ratio of 3, the activity of SiO2 can be effectively increased.

show abstract

Study of Thermodynamic for Low-Reactive CaO-BaO-Al2O3-SiO2-CaF2-Li2O Mold Flux Based on the Model of Ion and Molecular Coexistence Theory

Cited by 3 publications

References 22 publications

Assessment of Inclusion Removal Ability in Refining Slags Containing Ce2O3

Assessment of Inclusion Removal Ability in Refining Slags Containing Ce2O3

Prediction model for SiO2 activity in the CaO-Al2O3-SiO2-MgO quaternary slag system

Prediction Model for SiO2 Activity in the CaO-Al2O3-SiO2-MgO Quaternary Slag System

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