A Model for Estimating the Viscosity of Molten Aluminosilicate Containing Calcium Fluoride

Miyabayashi, Yoshitsugu; Nakamoto, Masashi; Tanaka, Toshihiro; Yamamoto, Tomokazu

doi:10.2355/isijinternational.49.343

Cited by 17 publications

(19 citation statements)

References 23 publications

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“…[22][23][24] When the basic oxides such as CaO or MgO are added into the silicate melt, reticular complex compounds will be fractured by the non-bridging oxygen ion and the free oxygen, which is shown in Figure 4. [25] For this reason, as the content of basic oxides (CaO or MgO) in the slag exceeds the concentration of acidic oxides (SiO 2 ), more network structure depolymerizes into short polymer units such as dimer or monomer. Meanwhile, the nonbridging oxygen ion and free oxygen move easily into the network structure as a destructor of the long chain, which leads to decrease of the slag viscosity.…”

Section: Influencing Mechanism Of Compositions On Viscositymentioning

confidence: 99%

Effect of Al₂O₃, MgO, and CaO/SiO₂on Viscosity of High Alumina Blast Furnace Slag

Ren

Wang

et al. 2015

steel research int.

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The effects of Al 2 O 3 , MgO, and binary basicity on the viscosity of high alumina blast furnace slag are studied systematically at the temperatures of 1773 K and below using the orthogonal experimental design method. The results show that, at fixed binary basicity (CaO/SiO 2 ) between 1.1 and 1.2, higher Al 2 O 3 content increase the slag viscosity due to the polymerization of the aluminate structures. At fixed Al 2 O 3 content between 15 and 20%, increasing the CaO/SiO 2 from 1.1 to 1.2 lead to lower viscosity due to the depolymerization of the aluminate structures. At fixed MgO between 9 and 11%, both increasing Al 2 O 3 content and CaO/SiO 2 can make the melting temperature increase. In addition, the viscosity data of high alumina blast furnace slag was in accordance with the estimated values of viscosity by Riboud model. Understanding the mechanism of Al 2 O 3 , MgO, and binary basicity on the viscosity of blast furnace slag can provide a promising method for optimizing its viscosity value and improving the blast furnace operation.

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Section: Influencing Mechanism Of Compositions On Viscositymentioning

confidence: 99%

Effect of Al₂O₃, MgO, and CaO/SiO₂on Viscosity of High Alumina Blast Furnace Slag

Ren

Wang

et al. 2015

steel research int.

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“…The change of slag‐forming elements (Ca, Mg, Al, Si, O) in the powder is an important factor in the viscosity of slag10–18, so it is very important to analyse precipitation process of slag forming elements in crystallization surface by boronzing influence:…”

Section: Results and Analysismentioning

confidence: 99%

Study of Boronizing Mechanism of High‐Alumina Slag

Zhang

Shao

et al. 2011

steel research int.

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As the Al2O3 content of the iron‐making raw materials increasing, the Al2O3 content in the slag increases as well, which is the certain result in the development of the iron‐making process. Based on the slag which was from the 2# blast furnace in Hebei Qianan of China, 7 different kinds of B compositions were added. The viscosity values of the CaO ‐MgO‐Al2O3‐SiO2‐B2O3 system were measured by using the torque. The SEM and EDS apparatus were used to observe the variation characteristics of the boronizing slag of the blast furnace. Viscosity mechanism model of the boronazing high‐alumina slag was got from the analysis of the EDS compositions. These detailed analysis including the influence on the slag forming components result from different B contents which shows the conclusion that the suitable B content makes good to the viscosity, melting temperature and stability of high‐alumina slag.

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“…It has been proposed that divalent cations lead to the formation of stable linkages (NBO‐M 2+ ‐NBO) resulting from the electrical neutrality, which hinders the viscous flow . Many researches have proposed that fluoride anions reduce the viscosity by breaking the linkage between the divalent cations and the NBOs (NBO‐M 2+ ‐NBO) . In addition, many studies have revealed using NMR spectroscopy, the preferential coordination of Cl − and F − to cations .…”

Section: Discussionmentioning

confidence: 99%

“…The model is based on a previous study by Bills for CaF 2 addition . This model has been reviewed by several research groups from the structural point of view . Silicate anions are bound by the electrostatic attraction between the divalent cations and NBO ions in the slag (NBO–M 2+ –NBO).…”

Section: Discussionmentioning

confidence: 99%

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Anionic effect of chloride, fluoride, and sulfide ions on the viscosity of slag melt

Lee

Min

2017

J Am Ceram Soc

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The effect of the addition of CaX (X=Cl2, F2 and S) on the viscous behavior and structure of CaO–SiO2–Al2O3–MgO–CaX slag was investigated by measuring its viscosity. The viscosity of the slag without CaX gradually decreased with an increase in the C/S ratio because of the depolymerization of the silicate groups in the slag. While the viscosity of the CaX‐bearing slag decreased with an increase in the CaX content, depolymerization was not observed in this case. Three distinct compositional regions for the activation energy of the viscous flow were observed because of the effect of the equilibrium of the polymeric silicate groups. The relaxation effect of the CaX groups on the activation energy was also observed. Raman spectroscopic analysis indicated that the relaxation in the viscosity and activation energy by CaX addition stemmed from the breaking of the NBO‐M2+‐NBO linkage to form NBO‐M2+‐F−, NBO‐M2+‐Cl−, or M2+‐S2−. All these results are discussed in detail with the help of a viscous flow model based on the ionic interactions.

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A Model for Estimating the Viscosity of Molten Aluminosilicate Containing Calcium Fluoride

Cited by 17 publications

References 23 publications

Effect of Al₂O₃, MgO, and CaO/SiO₂on Viscosity of High Alumina Blast Furnace Slag

Effect of Al₂O₃, MgO, and CaO/SiO₂on Viscosity of High Alumina Blast Furnace Slag

Study of Boronizing Mechanism of High‐Alumina Slag

Anionic effect of chloride, fluoride, and sulfide ions on the viscosity of slag melt

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A Model for Estimating the Viscosity of Molten Aluminosilicate Containing Calcium Fluoride

Cited by 17 publications

References 23 publications

Effect of Al2O3, MgO, and CaO/SiO2on Viscosity of High Alumina Blast Furnace Slag

Effect of Al2O3, MgO, and CaO/SiO2on Viscosity of High Alumina Blast Furnace Slag

Study of Boronizing Mechanism of High‐Alumina Slag

Anionic effect of chloride, fluoride, and sulfide ions on the viscosity of slag melt

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Product

Resources

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Effect of Al₂O₃, MgO, and CaO/SiO₂on Viscosity of High Alumina Blast Furnace Slag

Effect of Al₂O₃, MgO, and CaO/SiO₂on Viscosity of High Alumina Blast Furnace Slag