MgO Refractory Attack by Transient Non-saturated EAF Slag

Song, Shengqiang; Zhao, Junxue; Pistorius, Petrus Christiaan

doi:10.1007/s11663-020-01788-x

Cited by 25 publications

(13 citation statements)

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“…At undersaturated slag compositions, i.e., at MgO activity of <1, MgO is dissolved from the MgO-based hearth and hearth repair mixes or from the MgO-C-based sidewall, depending on the process temperature and duration (e.g., [16]), until MgO saturation of the slag is achieved. High-FeO slags provide increased corrosion potential to the MgO lining by the degradation of periclase to Mg-wüstite [17,18] and lowered slag viscosity.…”

Section: Mgo Saturation Of Eaf Slags-implications For the Refractory mentioning

confidence: 99%

“…This keeps the MgO activity in the slag at high levels, ideally close to 1. An increased mass of hot heel is recommended in order to provide a larger slag mass for buffering increased SiO 2 input, for example, due to DRI [18]. Models of MgO saturation are crucial to optimize the input of slag formers and slag operation in EAF steelmaking.…”

Section: Mgo Saturation Of Eaf Slags-implications For the Refractory mentioning

confidence: 99%

“…Another approach is the derivation of saturation diagrams from published phase diagrams in the CaO-MgO-FeO-SiO 2 -Al 2 O 3 system [4,5], or the application of phase equilibrium software [18,19,[28][29][30][31] such as Factsage [32] to calculate the required MgO saturation diagrams in the CaO-MgO-FeO-SiO 2 -Al 2 O 3 system for ladle and EAF slags. In all cases, a formula for a restricted range of slag compositions or an x-y diagram with a constraint slag composition, e.g., for a constant basicity, was chosen to determine the required MgO saturation for the particular process slag composition.…”

Section: Mgo Saturation Models For Steelmaking Slagsmentioning

confidence: 99%

“…Recently, Tayeb et al [26] verified the results from Factsage calculations with experimental MgO solubility data at typical slag compositions for BOFs and EAFs. Song et al [18] presented valuable predictions from a recent Factsage database of MgO saturation concentrations in EAF slags for a significantly larger experimental dataset.…”

Section: Calculated Mgo Saturation Surface In the System Cao-mgo-feo-mentioning

confidence: 99%

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Visualization of Slag Data for Efficient Monitoring and Improvement of Steelmaking Slag Operation in Electric Arc Furnaces, with a Focus on MgO Saturation

Kirschen

2020

Metals

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Frequent slag sampling and analysis is still the most common method used to investigate and improve slag operation in electric arc furnaces (EAFs) for low-alloyed carbon steelmaking. An MgO saturation diagram for EAF slags was derived from phase equilibrium calculations in the system CaO–MgO–FeO–SiO2–5%Al2O3 to provide monitoring and interpretation of the slag data with respect to control of MgO saturation, FeO reduction, dissolution from the MgO-based refractory lining, and unusual losses of repair mixes. Examples from 14 industrial EAFs are given.

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Section: Mgo Saturation Of Eaf Slags-implications For the Refractory mentioning

confidence: 99%

Section: Mgo Saturation Of Eaf Slags-implications For the Refractory mentioning

confidence: 99%

Section: Mgo Saturation Models For Steelmaking Slagsmentioning

confidence: 99%

Section: Calculated Mgo Saturation Surface In the System Cao-mgo-feo-mentioning

confidence: 99%

See 2 more Smart Citations

Visualization of Slag Data for Efficient Monitoring and Improvement of Steelmaking Slag Operation in Electric Arc Furnaces, with a Focus on MgO Saturation

Kirschen

2020

Metals

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“…[1][2][3] Melt corrosion is one of the main forms of refractory wear, especially slag corrosion caused by the Marangoni convection at the refractory-slag-air/metal three-phase interface in various metallurgical processes, [4][5][6][7][8] for instance, the slag line attack in Basic Oxygen Steelmaking (BOS) vessels and the corrosion at the interface of steel ladles and other furnaces containing molten metal and slag in contact with refractories. [9][10] Liquid flow induced by the Marangoni effect is known as Marangoni convection (or flow), and it has attracted considerable interest in research and in industries. 11 The Marangoni effect has been involved in various surface chemistry and fluid flow processes and is quite important for many industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Novel phenomenon of quasi‐volcanic corrosion on the alumina refractory‐slag‐air interface

Zou

Huang

2020

J Am Ceram Soc

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A novel phenomenon of quasi‐volcanic corrosion at refractory–slag–air interface under simulated normal smelting conditions was discovered when alumina refractory came in contact with CaO‐Al2O3‐SiO2 slags and soaked at 1600°C. Based on thermodynamic and microstructure analysis, the mechanism of quasi‐volcanic corrosion was revealed and the effect of CaO/SiO2 mass ratio (C/S ratio) on corrosion was discussed. The results indicate that a two‐stage intensified convection led to the severe upwelling corrosion of the refractory at the triple‐phase interface. Furthermore, the critical intensity of the corrosive convection at the first stage on the formation of “slag volcano” was determined. This can serve as guidance for prolonging the service life of alumina refractory.

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Corrosion Behavior of MgO–C Ladle Refractory by Molten Slag

Zhao

Zheng

Liu

et al. 2020

steel research int.

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The damage of ladle refractory, which mainly occurs at the position of the slag line, results in an increasing need of maintenance and repair and can, in the worst case, lead to a breakout of melts causing potential risks for the personnel and damage of equipment. On the basis of this fact, the corrosion behavior of MgO–C refractory in contact with molten slag during the steel refining process is experimentally studied in this work. Rotating and static dipping tests of MgO–C refractory in CaO–SiO2–Al2O3–MgO–FeO slags are conducted, and the effects of composition of slag, carbon in refractory, and rotation speed on the corrosion behavior are investigated. Results show that the corrosion depth of the MgO–C refractory increases with FeO content of slag and rotation speed of MgO–C rod, whereas it decreases with an increase in slag basicity. Slag notably penetrates the surface layer of MgO–C refractory after the carbon is oxidized, causing an aggravation of the corrosion. Moreover, the corrosion mechanism of MgO–C refractory in molten slag during the refining process is studied and illustrated in this work.

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MgO Refractory Attack by Transient Non-saturated EAF Slag

Cited by 25 publications

References 13 publications

Visualization of Slag Data for Efficient Monitoring and Improvement of Steelmaking Slag Operation in Electric Arc Furnaces, with a Focus on MgO Saturation

Visualization of Slag Data for Efficient Monitoring and Improvement of Steelmaking Slag Operation in Electric Arc Furnaces, with a Focus on MgO Saturation

Novel phenomenon of quasi‐volcanic corrosion on the alumina refractory‐slag‐air interface

Corrosion Behavior of MgO–C Ladle Refractory by Molten Slag

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