The Dissolution Kinetics of MgO into CaO-MgO-Fe2O3 Slag

Wei, Ruixue; Lv, Xuewei; Yue, Zhiwen; Xiang, Shenglin

doi:10.1007/s11663-016-0842-3

Cited by 11 publications

(3 citation statements)

References 16 publications

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“…Besides, work by Li et al suggested that the heat transfer could also affect the dissolution rate of lime in converter slag. For the dissolution mechanism of MgO, many of the works suggested that the mass transfer in boundary layer of molten slag was the rate‐controlling step, while Huang et al argued that the dissolution of the MgO was controlled by the mass transfer of MgO in the molten slag. For the dissolution mechanism of Al 2 O 3 , many of the works suggested that the dissolution was controlled by the mass transfer in the boundary layer of molten slag; while Monaghan argued that the mass transfer in the liquid slag was the rate‐controlling step.…”

Section: Introductionmentioning

confidence: 99%

Dissolution behavior of SiO₂ in the molten blast furnace slags

Tong

Zhang

et al. 2018

Int J Applied Ceramic Tech

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The kinetics of SiO2 dissolving in the molten blast furnace slags at 1743‐1803 K was studied using a High Temperature Confocal Scanning Laser Microscopy (HT‐CSLM), and then the effects of temperature, MgO and Al2O3 on the SiO2 dissolution were clarified in this study. The experiment results showed that the dissolution process is controlled by the solute diffusion in the slag. The SiO2 dissolution rate could be accelerated by increasing the temperature. Moreover, the SiO2 dissolution rate is the fastest in the slag with 11.0 pct MgO when the MgO varies between 7.0 and 13.0 pct. The SiO2 dissolution rate is the fastest in the slag with 18.0 pct Al2O3 when the Al2O3 varies between 14.0 and 20.0 pct. The effects of temperature, MgO and Al2O3 on the SiO2 dissolution rate could be indicated by a simple expression (csat−cb)/η that a larger of (csat−cb)/η is associated with the faster SiO2 dissolution rate, where (csat−cb) is the difference between the concentration of SiO2 in the saturated slag and in the bulk of slag, and η is the slag viscosity.

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Section: Introductionmentioning

confidence: 99%

Dissolution behavior of SiO₂ in the molten blast furnace slags

Tong

Zhang

et al. 2018

Int J Applied Ceramic Tech

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“…The importance of such dissolution models for basic slag additives in steelmaking has been justified by the endeavors of many researchers. [3,[5][6][7]15,22,30,31,[34][35][36][37][38][40][41][42][43][44][45] Finally, trials under dynamic conditions with the tested materials will indicate the transformability of the results to the industrial process.…”

Section: Discussionmentioning

confidence: 99%

Calcination Condition of Dolomite‐Based Materials Influencing Static Dissolution in Synthetic Electric Arc Furnace Slag

Lesiak¹,

Cheremisina²,

Rieger³

et al. 2022

steel research int.

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The addition of basic additives in steelmaking processes is essential because these lead to slag adaptation and enable refining reactions. In calcination treatment, the process parameters temperature and dwell time influence the decomposition of dolomite as a magnesium‐containing lime substitute. It results in specific properties such as varying residual fractions of carbonates CaCO3·MgCO3 and porosity. The properties affect the dissolution kinetics, and the fast and complete dissolution is of interest. Hence, the static high‐temperature dissolution tests using dolomite‐based samples in diverse conditions (raw, modified, soft‐burnt, and hard‐burnt) are executed to determine the impact of the calcination state. The specimens are immersed in synthetic electric arc furnace slag, including 10 wt% Al2O3, 25 wt% SiO2, 25 wt% CaO, 8 wt% MnO, and 32 wt% FeO. The dolomite or dolime dissolves in the stagnant oxidic melt within the reaction time of 10 min at 1450 °C. The resulting chemistries of quenched slags, representing the current dissolution status, are examined by scanning electron microscopy using energy‐dispersive X‐ray spectroscopy analysis on metallographically prepared cross‐sections and via X‐ray fluorescence analysis of mechanically extracted slag fractions. The dissolution performance is characterized and compared for the different additive materials.

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“…Many investigations were carried out on the dissolution mechanism of Al 2 O 3 [15][16][17][18][19][20][21][22][23] and MgO [23][24][25][26][27][28] by using a traditional rotating cylinder/disc technique or a new hightemperature confocal scanning laser microscopy (HT-CSLM) technique. Fewer works were conducted on the dissolution kinetics mechanism of SiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Dissolution behavior of silica in molten CaO–SiO₂–Fe₂O₃–MgO–MnO slag

et al. 2022

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The modification of basic oxygen furnace (BOF) slag by adding silica can improve the properties of BOF slag for applications in the cement industry. The rapid dissolution of silica is essential to hot slag modification. In this work, the dissolution behavior of silica in the molten CaO–SiO2–Fe2O3–MgO–MnO system as synthetic BOF slag was investigated by using the traditional rotating cylinder technique. Effects of rotation speed, temperature, immersion time, and slag basicity on the silica dissolution were studied. Scanning electron microscopy equipped with energy dispersive spectrometer (SEM‐EDS) and FactSage simulations were employed to reveal the dissolution mechanism. It was found that the dissolution of the silica rod was affected by both the thermodynamic driving force and the slag viscosity. The silica dissolution rate in molten CaO–SiO2–Fe2O3–MgO–MnO slag increased with increasing the rotation speed and temperature, but first increased and then decreased when decreasing the slag basicity from 2.5 to 1.5. A linear correlation between the logarithm of the dissolution rate and the logarithm of cylinder periphery velocity with a slope of 0.44 was observed, indicating the mass transfer within the boundary layer as the dissolution rate determining step. A direct dissolution way was found during the dissolution of silica in molten CaO–SiO2–Fe2O3–MgO–MnO slag.

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The Dissolution Kinetics of MgO into CaO-MgO-Fe2O3 Slag

Cited by 11 publications

References 16 publications

Dissolution behavior of SiO₂ in the molten blast furnace slags

Dissolution behavior of SiO₂ in the molten blast furnace slags

Calcination Condition of Dolomite‐Based Materials Influencing Static Dissolution in Synthetic Electric Arc Furnace Slag

Dissolution behavior of silica in molten CaO–SiO₂–Fe₂O₃–MgO–MnO slag

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The Dissolution Kinetics of MgO into CaO-MgO-Fe2O3 Slag

Cited by 11 publications

References 16 publications

Dissolution behavior of SiO2 in the molten blast furnace slags

Dissolution behavior of SiO2 in the molten blast furnace slags

Calcination Condition of Dolomite‐Based Materials Influencing Static Dissolution in Synthetic Electric Arc Furnace Slag

Dissolution behavior of silica in molten CaO–SiO2–Fe2O3–MgO–MnO slag

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Dissolution behavior of SiO₂ in the molten blast furnace slags

Dissolution behavior of SiO₂ in the molten blast furnace slags

Dissolution behavior of silica in molten CaO–SiO₂–Fe₂O₃–MgO–MnO slag