Activities of SiO2 in Some CaO-Al2O3-SiO2(-10%MgO) Melts with Low SiO2 Contents at 1873K

Kang, Young Jo; Sichen, Du; Morita, Kazuki

doi:10.2355/isijinternational.47.805

Cited by 19 publications

(9 citation statements)

References 6 publications

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“…After LF treatment, the calculated values of silicon activity in the slag are steady at the level 10 −4 (wt.%), which corresponds to a SiO 2 content of a few per cent. This is in accordance with the earlier published results [25].…”

Section: Resultssupporting

confidence: 83%

Relationship between the common optical basicity models and the sulphide capacities of CaO-Al2O3-SiO2-MgO slag

Slović¹,

Nedeljkovic²,

Raić³

et al. 2012

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The correlations between the sulphide capacity and the optical basicity models available in literature are reviewed. The relationship between sulphide capacity and the optical basicity was investigated on plant data collected from the BOF plant in the temperature range of 1565-1650• C. The goal of this work was to compare results given by applying common acceptable Young's, Sosinsky-Sommerville's, Tsao-Katayama's and Taniguchi's optical basicity as well as the KTH model for calculating the sulphide capacities. The present paper is focused on the thermodynamic aspect of sulphur refining CaO-Al2O3-SiO2-MgO ladle slag during LF ladle treatment. Thirty one heats were employed in the present study in real production conditions of low carbon steels.K e y w o r d s : steels, thermodynamics, analytical methods, optical basicity, sulphide capacity

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Section: Resultssupporting

confidence: 83%

Relationship between the common optical basicity models and the sulphide capacities of CaO-Al2O3-SiO2-MgO slag

Slović¹,

Nedeljkovic²,

Raić³

et al. 2012

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“…11(b) that the decrease tendencies of SiO2 activity are the same, and the activities of SiO2 are very close to zero when the basicity is larger than 2, indicating that SiO2 is almost stable at this time. Similar results were also reported by Kang et al 31) According to Eq. (10), the reduction of SiO2 is also related to the activity of Al2O3.…”

Section: Basicity Of Refining Slagsupporting

confidence: 92%

Deoxidation Mechanism of Al-Killed Steel during Industrial Refining Process

Deng

Zhu

2014

ISIJ Int.

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Deoxidation is a key step for steel refining, and it would influence the cleanliness of final product. In present study, the measured and calculated oxygen activities in Al-killed bulk steel were compared according to industrial trails, and the Fe-O equilibrium at the interface between slag and steel was also concerned by thermodynamic analysis. Finally, the deoxidation mechanism of Al-killed during industrial refining was proposed. It is found that the activity of oxygen in bulk steel is controlled by Al content, since the activity of oxygen in bulk steel is very close to the equilibrium value as the activity of Al2O3 is treated as unity. In order to keep low oxygen in molten steel, a certain Al content needs to be guaranteed. At slag-steel interface, the activity of oxygen is controlled by FeO, which is much larger than that of bulk steel, so the oxygen would transfer from slag into bulk steel. Slagging therefore presents its importance for deoxidation to reduce the oxygen transfer. Besides, the essence of SiO2 supplying oxygen is Al consumption in bulk steel, which gives rise to the increase of dissolved oxygen. So, stable refining slag is also very important to obtain low oxygen steel, and the slag basicity needs to be no smaller than 3 to reduce the Al consumption caused by SiO2 reduction. In present study, the basicity of 3-4 is recommended to refine low oxygen Al-killed steel.

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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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Activities of SiO2 in Some CaO-Al2O3-SiO2(-10%MgO) Melts with Low SiO2 Contents at 1873K

Cited by 19 publications

References 6 publications

Relationship between the common optical basicity models and the sulphide capacities of CaO-Al2O3-SiO2-MgO slag

Relationship between the common optical basicity models and the sulphide capacities of CaO-Al2O3-SiO2-MgO slag

Deoxidation Mechanism of Al-Killed Steel during Industrial Refining Process

Study of Boronizing Mechanism of High‐Alumina Slag

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