Influence of Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; and MgO on the Viscosity and Stability of CaO–MgO–SiO&lt;sub&gt;2&lt;/sub&gt;–Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Slags with CaO/SiO&lt;sub&gt;2&lt;/sub&gt;=1.0

Sun, Changyu; Liu, Xiaohong; Li, Jing; Yin, Xi-Tao; Song, Sunny; Wang, Qi

doi:10.2355/isijinternational.isijint-2016-235

Cited by 37 publications

(9 citation statements)

References 21 publications

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“…A similar phenomenon was observed by Mudersbach et al [41], Kim et al [42], and Sun et al [43], which showed that the slag viscosity exhibited a minimum value by increasing MgO content with a fixed C/S and Al 2 O 3 content, even though the slag was fully liquid. In Zhang's review [44], MgO was proposed to have a relatively high stability and be more effective in increasing viscosity due to its high melting point.…”

Section: Interpretation Of the Unusual Viscositysupporting

confidence: 83%

Roles of MgO and Al2O3 on the Viscous and Structural Behavior of Blast Furnace Primary Slag, Part 1: C/S = 1.3 Containing TiO2

Sun

Song

et al. 2019

Metals

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This research provides fundamental insight into the roles of MgO and Al 2 O 3 on the viscous and structural behaviors of CaO−SiO 2 −MgO−Al 2 O 3 −10 mass% TiO 2 −5 mass% FeO (CaO/SiO 2 = 1.3) system primary blast furnace slag. The slag viscosity is measured by the rotating cylinder method, which is essential to the efficient and stable operation of a blast furnace. The network structure characterization of the quenched vitreous samples was conducted using Fourier Transformation Infrared (FTIR) and Raman spectroscopy. Usual viscous behaviors (that the slag viscosity and the activation energy decrease or increase with increasing MgO or Al 2 O 3 content) were observed, corresponding to changes in the network structure certified by FTIR and Raman analyses. It seems that the addition of MgO and Al 2 O 3 prefers to modify the Si−O and Ti−O network in the present slag. When the slag composition reaches 10% MgO and 12% Al 2 O 3 , unexpected viscous behaviors (that MgO increases viscosity and Al 2 O 3 decreases viscosity) are discovered. The roles of MgO and Al 2 O 3 could be interpreted by changes in the arrangement structure of ions in liquid, corresponding to changes in the primary equilibrium phase region determined in phase diagrams and variation in the difference between the experimental and liquidus temperature, respectively.

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Section: Interpretation Of the Unusual Viscositysupporting

confidence: 83%

Roles of MgO and Al2O3 on the Viscous and Structural Behavior of Blast Furnace Primary Slag, Part 1: C/S = 1.3 Containing TiO2

Sun

Song

et al. 2019

Metals

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“…It is visible that the viscosity and the melting temperature of the glasses decrease with the replacement of SiO 2 with CaO and MgO. For reference, an increase in the MgO content leads to a decrease in the high-temperature viscosity in the CaO-SiO 2 -Al 2 O 3 --MgO slag [49]. MgO provides excess oxygen ions and depolymerises the structure into small structural units.…”

Section: Rheological Property Analysismentioning

confidence: 99%

EFFECT OF THE CaO-MgO-Al₂O₃-SiO₂ GLASS COMPOSITION ON THE MICROSTRUCTURE AND RHEOLOGICAL PROPERTIES FROM A MOLECULAR DYNAMICS SIMULATION

Gu¹

2022

Ceramics - Silikaty

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By adjusting the ratio of SiO 2 /RO (R=Ca, Mg), this article studied the atomic structure of CaO-MgO-Al 2 O 3 -SiO 2 glassy melts by a molecular dynamics simulation. The Pair distribution function (PDF), Coordination number (CN), bridging oxygen (BO), non-bridging oxygen (NBO), and Qn were utilised to characterise the glass structure. The results indicated that the content of the bridging oxygen was decreased with the RO replacing the SiO 2 . The total content of Q4 in the tetrahedron changed significantly from 34.11 % to 18.06 %. Meanwhile, the NBO/T parameter increased from 1.298 to 1.555. In the corresponding viscosity test, the melting temperature, fitted by the MYEGA equation, also decreased with the decrease in the SiO 2 content, and the fragility value increased from 39.12 to 53.20. Finally, the fragility and NBO/T were linked to describing the relationship between the mid-range structure and the rheological property. Moreover, the analyses showed that they had a linear relationship.

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“…Moreover, a tremendous amount of slag with high Al 2 O 3 is produced during the ferronickel alloy and ferrochromium alloy production process [19][20][21]. As we know, the fluidity property of slag has a considerable influence on the smelting process and separation of metals from slag [22][23][24][25][26]. Therefore, it is vital to study the viscosity and crystallization behavior of high-alumina slag.…”

Section: Introductionmentioning

confidence: 99%

Effects of Basicity and Al2O3 Content on Viscosity and Crystallization Behavior of Super-High-Alumina Slag

et al. 2022

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The CaO-SiO2-MgO-Al2O3 slags with high alumina content are widely applied in various pyrometallurgical processes. However, for super-high-alumina slags, especially for those with alumina content of more than 25 wt%, there is a lack of relevant studies about the properties of slag. The melting behavior, viscosity, structural property, and crystallization behavior of high-alumina slag with the fixed MgO content of 11.13 wt% and Al2O3 content from 27.61 wt% to 40 wt% were investigated. The results revealed that the liquidus temperatures and complete solidification temperatures of slag increased with the increasing binary basicity and Al2O3 content. The melting temperature and viscosity of the CaO-SiO2-11.13wt%MgO-Al2O3 slag system increased with the increasing basicity from 0.8 to 1 and Al2O3 content from 27.61 wt% to 40 wt%. The increase in Al2O3 caused the formation of high-crystallinity and high melting point materials in the slag, such as spinel and Åkermanite. A large number of non-uniform phases could quickly crystallize out of the solids present in the slag melt, thereby increasing the slag viscosity and deteriorating the fluidity of the slag.

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Influence of Al<sub>2</sub>O<sub>3</sub> and MgO on the Viscosity and Stability of CaO–MgO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> Slags with CaO/SiO<sub>2</sub>=1.0

Cited by 37 publications

References 21 publications

Roles of MgO and Al2O3 on the Viscous and Structural Behavior of Blast Furnace Primary Slag, Part 1: C/S = 1.3 Containing TiO2

Roles of MgO and Al2O3 on the Viscous and Structural Behavior of Blast Furnace Primary Slag, Part 1: C/S = 1.3 Containing TiO2

EFFECT OF THE CaO-MgO-Al₂O₃-SiO₂ GLASS COMPOSITION ON THE MICROSTRUCTURE AND RHEOLOGICAL PROPERTIES FROM A MOLECULAR DYNAMICS SIMULATION

Effects of Basicity and Al2O3 Content on Viscosity and Crystallization Behavior of Super-High-Alumina Slag

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