Effect of High Al&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt; Slag on the Blast Furnace Operations

Sunahara, Kohei; Nakano, Koji; Hoshi, Masahiko; Inada, Takanobu; Komatsu, Shusaku; Yamamoto, Tomokazu

doi:10.2355/tetsutohagane1955.92.12_875

Cited by 23 publications

(14 citation statements)

References 9 publications

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“…The chemical compositions of these melts lie mostly in the percalcic region (CaO/Al2O3 molar ratio > 1) 1,2) of the CaO-SiO2-Al2O3 ternary system. Similar melts can also be extracted from the melting furnaces used for the incineration of municipal waste.…”

Section: Introductionmentioning

confidence: 99%

Effect of Potassium Oxide Addition on Viscosity of Calcium Aluminosilicate Melts at 1673–1873 K

et al. 2014

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We investigated the changes induced in the viscosities of CaO-SiO2-Al2O3-K2O melts (CaO/SiO2 molar ratio = 0.68 ± 0.04, Al2O3 content = 13.4 ± 0.6 mol%) with the addition of K2O in amounts of 0-17.4 mol% for temperatures of 1 673-1 873 K using the rotating crucible method. The viscosity increased with an increase in the K2O content when K2O/Al2O3 molar ratio < 0.7. On the other hand, the viscosity decreased with the addition of K2O for K2O/Al2O3 molar ratio > 0.9. The maximum values of the viscosities were noticed in the range of 0.7 < K2O/Al2O3 molar ratio < 0.9. This behavior could not be explained on the basis of the polymerization degree of the aluminosilicate network structure. The 17 O magic angle spinning nuclear magnetic resonance (MAS NMR) spectrum of the 31.6CaO-44.2SiO2-13.4Al2O3-10.8K2O (mol%) glass suggested that K + ions preferentially compensate the negative charge of AlO4, while the Ca 2+ ions primarily create non-bridging oxygens (NBOs). The viscosity data and the 17 O MAS NMR spectrum also suggested that the increase in viscosity for K2O/Al2O3 molar ratio < 0.7 was because of the increase in the average bond strength of the aluminosilicate framework, which was attributable to the substitution of Ca 2+ ions by K + ions at the charge compensator sites. The activation energies for viscous flow indicated that the NBOs bonded with K + ions, forming NBO-K species, for K2O contents greater than those corresponding to the viscosity maxima. Thus, the viscosities of aluminosilicate melts are indicative of the average bond strengths of the melts.KEY WORDS: viscosity; K-Ca aluminosilicate melts and glasses;17 O MAS NMR spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Effect of Potassium Oxide Addition on Viscosity of Calcium Aluminosilicate Melts at 1673–1873 K

et al. 2014

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“…et al 12) and Sunahara et al 10) have insisted that MgO dissolves into the slag phase, affecting physicochemical properties of slag, and thereby decreases the dripping temperature and increases the hearth drainage rate of slag. The decrease in the dripping temperature, in turn, makes the cohesive zone thinner, resulting in the increase of gas permeability in a blast furnace.…”

Section: Role Of Mgo In Sinter From Perspective Of Mgo Distribution Bmentioning

confidence: 99%

“…[1][2][3][4] In particular, the increase of Al 2 O 3 content in iron ore is very serious because Al 2 O 3 lowers the reducibility of iron ore sinter and decreases the gas permeability in a blast furnace. 5,6) To overcome these problems, many attempts have been done, such as introducing micro pores into the sinter, 7) decreasing the volumes of gangue minerals in the sinter 7) and optimizing the compositions 4,[8][9][10] of gangue minerals in the sinter.…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12][13] For example, Matsumura et al 11) have tried to add MgO into the sinter in the form of dolomite. They have found that the reducibility of the sinter is improved, and explained that the improvement is due to less formation of silicate slag phase with poor reducibility because both MgO and SiO 2 dissolve into calcium ferrite which is the major part of the sinter.…”

Section: Introductionmentioning

confidence: 99%

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Role of MgO in Sinter from Perspective of MgO Distribution between Liquid and Magnetite Phases in FeO<sub>x</sub>–CaO–SiO<sub>2</sub>–MgO System

et al. 2017

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“…As a result, more alumina (exceeding 15% in many enterprises) or titania (more than 10%) occur in the BF slag, resulting in higher viscosity, worse fluidity, and poor operational stability [4][5][6][7][8][9][10]. So it is essential to studying the viscous behavior of BF slag with more alumina (above 15%) or titania (above 10%) for optimizing the iron-making operation.…”

Section: Introductionmentioning

confidence: 99%

Influence of Al₂O₃, CaO/SiO₂, and B₂O₃ on Viscous Behavior of High Alumina and Medium Titania Blast Furnace Slag

Bian

Gao

2017

Journal of Chemistry

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on the viscosity of high alumina and medium titania blast furnace slag was analyzed. An increase in CaO/SiO 2 ratio from 1.14 to 1.44 resulted in higher slag viscosity and break point temperature. They also increased with increasing Al 2 O 3 content but decreased with adding B 2 O 3 and Al 2 O 3 simultaneously at a fixed CaO/SiO 2 ratio of 1.14, which suggested that the effect of B 2 O 3 on viscosity and break point temperature is predominant compared to Al 2 O 3 . Apparent activation energies of CaO-SiO 2 -MgO-Al 2 O 3 -TiO 2 -B 2 O 3 slag were found to be between 74 and 169 kJ/mol.

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Effect of High Al<SUB>2</SUB>O<SUB>3</SUB> Slag on the Blast Furnace Operations

Cited by 23 publications

References 9 publications

Effect of Potassium Oxide Addition on Viscosity of Calcium Aluminosilicate Melts at 1673–1873 K

Effect of Potassium Oxide Addition on Viscosity of Calcium Aluminosilicate Melts at 1673–1873 K

Role of MgO in Sinter from Perspective of MgO Distribution between Liquid and Magnetite Phases in FeO<sub>x</sub>–CaO–SiO<sub>2</sub>–MgO System

Influence of Al₂O₃, CaO/SiO₂, and B₂O₃ on Viscous Behavior of High Alumina and Medium Titania Blast Furnace Slag

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Effect of High Al<SUB>2</SUB>O<SUB>3</SUB> Slag on the Blast Furnace Operations

Cited by 23 publications

References 9 publications

Effect of Potassium Oxide Addition on Viscosity of Calcium Aluminosilicate Melts at 1673–1873 K

Effect of Potassium Oxide Addition on Viscosity of Calcium Aluminosilicate Melts at 1673–1873 K

Role of MgO in Sinter from Perspective of MgO Distribution between Liquid and Magnetite Phases in FeO<sub>x</sub>–CaO–SiO<sub>2</sub>–MgO System

Influence of Al2O3, CaO/SiO2, and B2O3 on Viscous Behavior of High Alumina and Medium Titania Blast Furnace Slag

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Influence of Al₂O₃, CaO/SiO₂, and B₂O₃ on Viscous Behavior of High Alumina and Medium Titania Blast Furnace Slag