Roles of MgO and Al2O3 in Viscous and Structural Behavior of Blast Furnace Primary Slag with C/S = 1.4

Li, Tingle; Zhao, Chenguang; Sun, Changyu; Song, Sunny; Wang, Qi

doi:10.1007/s11663-020-01980-z

Cited by 21 publications

(7 citation statements)

References 31 publications

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“…The FTIR spectra for different basicity and different Al2O3 content are shown in Figure 5. According to previous studies, the vibration band of silicates ranges from 1200-400 cm -1 [28,29]. The strong broadband of 1200-750 cm -1 is generally associated with the symmetric stretching vibration of the [SiO4] 4-tetrahedral unit [ 30 ], and the weak broadband of 750-630 cm -1 is generally associated with the asymmetric stretching vibration of the [AlO4] 5-tetrahedral unit [31].…”

Section: Effect Of Basicity and Al2o3 On Slag Structure And Precipitated Phasesmentioning

confidence: 90%

Effect of Basicity and Al2O3 on Viscosity of Blast Furnace Slag and Thermodynamic Analysis

Zhang¹,

Liu²,

Zhang³

et al. 2021

Preprint

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With the increased use of laterite nickel ore, the impact of high Al2O3 slag on blast furnace smelting has gradually increased. In this paper, the effects of slag basicity and Al2O3 content on slag viscosity and enthalpy change under constant temperature conditions was investigated. The changes in slag structure were analyzed by activation energy and Fourier Transform Infrared (FT-IR) spectroscopy. The relationship between slag components and slag temperature and viscosity when slag heat is reduced was investigated. The results showed that the viscosity first slightly decreased and then significantly increased with increasing basicity at constant temperature. With the addition of Al2O3 content, the viscosity of the slag increases. The activation energy increases with increasing slag basicity and Al2O3. With increasing basicity, the [SiO4]4- tetrahedral unit trough depth becomes shallow, the [AlO4]5- asymmetric stretching band migrates to lower wave numbers, and the slag structure depolymerizes. With the increase of Al2O3 content, the trough of [SiO4]4- tetrahedra deepens and the center of the symmetric stretching band moves to a higher wave number. The [AlO4]5- asymmetric stretching band becomes obvious, indicating the complexity of the slag structure. When the heat decreases, the slag temperature increases as the basicity increases, and the slag thermal stability is better at the basicity of 0.95-1.05. As the Al2O3 content increases, the thermal stability of the slag becomes worse.

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Section: Effect Of Basicity and Al2o3 On Slag Structure And Precipitated Phasesmentioning

confidence: 90%

Effect of Basicity and Al2O3 on Viscosity of Blast Furnace Slag and Thermodynamic Analysis

Zhang¹,

Liu²,

Zhang³

et al. 2021

Preprint

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“…Jian ZHANG, 1,2) Kexin JIAO, 1,2) * Jianliang ZHANG, 1,2) Hengbao MA, 1,2) Yanbing ZONG, 1) Ziyu GUO 1,2) and Zhongyi WANG 1,2) the content of Al 2 O 3 , and the melting temperature of the primary phase was the highest when the content of Al 2 O 3 was 24%. Li et al 12) studied the effect of MgO content on the viscosity of slag when the alkalinity is 1.4. As the MgO content increases from 6 mass percent to 16 mass percent, the viscosity fluctuates and assumes a "W" shape, showing two minimum values at 8 mass percent and 12 mass percent MgO.…”

Section: Thermal Stability Of Molten Slag In Blast Furnace Hearthmentioning

confidence: 99%

Thermal Stability of Molten Slag in Blast Furnace Hearth

et al. 2021

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The thermal stability of the molten slag plays an extremely important role in the smooth production of the blast furnace. In this paper, the effects of basicity, Al 2 O 3 content and MgO content on the thermal stability of the slag during heat fluctuations were investigated. The effect of slag basicity and composition on slag viscosity behavior was measured by the rotating cylinder method under the condition of heat fluctuation and constant temperature. The slag temperature and solid phase precipitation under thermal fluctuations were calculated. The effect of thermal fluctuations of the slag on viscosity was clarified. The results show that the specific heat capacity of the slag first decreases and then increases as the slag basicity increases, and it increases with the rise of Al 2 O 3 as well as MgO. The average viscosity change rate of slag under fixed heat is much more pronounced than that of at a constant temperature with the variation of slag basicity as well as Al 2 O 3 , while it is inverse for the effect of MgO. When the slag heat is reduced, the change in slag basicity has the greatest effect on the slag temperature, followed by the Al 2 O 3 content and MgO content. It indicates that MgO helps to maintain a stable slag temperature. Therefore, appropriately increasing the basicity of the slag, controlling a lower Al 2 O 3 content and maintaining a suitable MgO content will help to improve the thermal stability of the slag.

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“…[ 2 ] Iron ore with high Al 2 O 3 content is widely available in India and Australia. [ 3 ] BF slags produced using raw materials rich in TiO 2 can have both beneficial and detrimental effects. It is known from the literature that iron ore rich in TiO 2 generates a “titanium bear”, that is, a protective layer of titanium carbonitride formed on a refractory brick.…”

Section: Introductionmentioning

confidence: 99%

“…[6] Numerous measurements of the viscosity of BF slags have been made in previous studies. The viscosities of synthetic, industrial, and primary BF slags were studied as a function of TiO 2 addition, [1,[5][6][7][8][9][10] Al 2 O 3 addition, [2,3,11,12] and V 2 O 3 addition. [13] Thus, it is known from previous studies that the effect of TiO 2 and Al 2 O 3 on viscosity mainly depends on the slag composition.…”

Section: Introductionmentioning

confidence: 99%

Effect of Al₂O₃ and TiO₂ on Viscosity, Surface Tension, and Density of Blast Furnace Slag with CaO/SiO₂ = 1.13

Bartzsch

Christian

Mohanty

et al. 2023

steel research int.

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The influence of Al2O3 in the range of 10–20 mass% and TiO2 in the range of 0.55–5 mass% on the flow behavior, viscosity, density, and surface tension of molten industrial blast furnace slag with CaO/SiO2 = 1.13 is investigated using a high‐temperature microscope, a rotating viscometer, and the maximum bubble pressure method. The measurement results show that Al2O3 acts as a network former in the studied CaO–SiO2–MgO–Al2O3–TiO2 slags. With an increase in the Al2O3 content from 10 to 20 mass%, the viscosity and surface tension of the slags increase and the density decreases. In contrast to Al2O3, the TiO2 acts as a surfactant and network breaker in the range of up to 15 mass%. The addition of TiO2 up to 15 mass% results in a decrease in the viscosity in the liquid‐dominated region and a decrease in the surface tension of the studied slags. Therefore, the density increases with the addition of TiO2 due to increasing molar volume. The behavior of the breakpoint temperature on all the viscosity curves is in complete agreement with the behavior of the flow point temperature and crystallization temperatures of melilite and perovskite.

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Roles of MgO and Al2O3 in Viscous and Structural Behavior of Blast Furnace Primary Slag with C/S = 1.4

Cited by 21 publications

References 31 publications

Effect of Basicity and Al2O3 on Viscosity of Blast Furnace Slag and Thermodynamic Analysis

Effect of Basicity and Al2O3 on Viscosity of Blast Furnace Slag and Thermodynamic Analysis

Thermal Stability of Molten Slag in Blast Furnace Hearth

Effect of Al₂O₃ and TiO₂ on Viscosity, Surface Tension, and Density of Blast Furnace Slag with CaO/SiO₂ = 1.13

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Roles of MgO and Al2O3 in Viscous and Structural Behavior of Blast Furnace Primary Slag with C/S = 1.4

Cited by 21 publications

References 31 publications

Effect of Basicity and Al2O3 on Viscosity of Blast Furnace Slag and Thermodynamic Analysis

Effect of Basicity and Al2O3 on Viscosity of Blast Furnace Slag and Thermodynamic Analysis

Thermal Stability of Molten Slag in Blast Furnace Hearth

Effect of Al2O3 and TiO2 on Viscosity, Surface Tension, and Density of Blast Furnace Slag with CaO/SiO2 = 1.13

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Effect of Al₂O₃ and TiO₂ on Viscosity, Surface Tension, and Density of Blast Furnace Slag with CaO/SiO₂ = 1.13