Dynamic interaction of refractory and molten steel: Corrosion mechanism of alumina-magnesia castables

Huang, Ao; Wang, Yajie; Zou, Yongshun; Gu, Huazhi; Fu, Lvping

doi:10.1016/j.ceramint.2018.05.085

Cited by 50 publications

(25 citation statements)

References 18 publications

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“…The induction furnace test is a semi-static test. It consists of heating steel [46], topped or not with slag [47], by induction. For this test, refractories are shaped to form a crucible with polygonal surface, as shown in Figure 10a [10,11].…”

Section: Induction Furnace Testmentioning

confidence: 99%

Corrosion Tests for Refractory Materials Intended for the Steel Industry - A Review

Reynaert¹

2020

Ceramics - Silikaty

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The steel industry is one the biggest consumers of refractories. In this industry, refractories are commonly used as linings for steel production equipment, because they can sustain high temperature and corrosive attack in their working environment. However due to the harsh conditions, their life span is limited. Corrosion mainly by slag and molten steel is the principal phenomenon responsible for degradation and wear of the refractory bricks. It is a complex phenomenon that is due to infiltration (penetration) into and subsequent dissolution of the refractories by slags and molten steel. A thorough understanding of these mechanisms is necessary in order to improve the refractories behavior for steel making applications. However, even nowadays, no laboratory test can reproduce the real working conditions in the steel industry. According to the parameter of interest several testing methods have been developed. They can be static like the sessile drop test or crucible test or dynamic like the rotary slag test. This paper describes the principal corrosion tests used in the steel industry in order to give an overview of the way to determine and finally alleviate the impact of corrosion on refractories. Corrosion tests for refractory materials intended for the steel industry -A reviewCeramics - Silikáty 64 (3) 278-288 (2020)

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Section: Induction Furnace Testmentioning

confidence: 99%

Corrosion Tests for Refractory Materials Intended for the Steel Industry - A Review

Reynaert¹

2020

Ceramics - Silikaty

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“…MgO-Al 2 O 3 refractories are widely used as working linings for high-temperature furnaces due to their excellent mechanical and thermo-mechanical properties as well as due to remarkable slag resistance. [1][2][3][4][5][6][7][8][9][10][11] The MgO-Al 2 O 3 refractories used for working linings of high-temperature furnaces usually consist of dense MgO-Al 2 O 3 aggregates and matrices, which have high thermal conductivities. The high thermal conductivities often cause immense heat losses through the linings of high-temperature furnaces, which is not conducive to energy-saving and emission-reduction.…”

Section: Introductionmentioning

confidence: 99%

“…With the significant consumption of resources and the deterioration of the environment, the pressure of energy‐saving and emission‐reduction in metallurgical and other high‐temperature industrial furnaces is increasing. MgO‐Al 2 O 3 refractories are widely used as working linings for high‐temperature furnaces due to their excellent mechanical and thermo‐mechanical properties as well as due to remarkable slag resistance 1‐11 . The MgO‐Al 2 O 3 refractories used for working linings of high‐temperature furnaces usually consist of dense MgO‐Al 2 O 3 aggregates and matrices, which have high thermal conductivities.…”

Section: Introductionmentioning

confidence: 99%

Microstructures and strengths of microporous MgO‐Al₂O₃ refractory aggregates using two types of magnesite

Chen

Yan

Dai

et al. 2020

Int J Applied Ceramic Tech

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Six microporous MgO-Al 2 O 3 refractory aggregates were prepared with Al(OH) 3 and two different types of magnesite powders via an in-situ decomposition pore-forming technique. One magnesite powder contained more CaO (Magnesite C), the other one contained more SiO 2 and Al 2 O 3 impurities (Magnesite SA). Effects of magnesite powder type and content (11 wt.%, 36 wt.% and 77 wt.%) on the phase compositions, microstructures and mechanical strengths of the prepared microporous aggregates were investigated by X-ray diffractometry (XRD), mercury porosimetry measurements, and scanning electron microscopy (SEM), etc. With the addition of 11 wt.% and 77 wt.% magnesite, the type of magnesite had only a small effect on the microporous corundum-spinel and periclase-spinel aggregates, while great influence on the microporous spinel aggregates was observed with 36 wt.% addition. This was mainly because of the sintering process with liquid phase. The best microporous MgO-Al 2 O 3 refractory aggregates, which had an apparent porosity of 39.1%, a median pore size of 3.38 μm and a compressive strength of 66.3 MPa, were prepared by using 36 wt.% Magnesite C. This work has practical significance for the efficient utilization of magnesite and the development of energy-saving lightweight MgO-Al 2 O 3 refractories. K E Y W O R D S in-situ decomposition pore-forming technique, magnesite powders, microporous MgO-Al 2 O 3 refractory aggregates, microstructures, properties Department of Education's Scientific Research Plan (Grant No. D20181106) for financially supporting this work.

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“…Refractory usually serves as lining material to ensure safe and efficient production in high-temperature industries. [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.…”

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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Dynamic interaction of refractory and molten steel: Corrosion mechanism of alumina-magnesia castables

Cited by 50 publications

References 18 publications

Corrosion Tests for Refractory Materials Intended for the Steel Industry - A Review

Corrosion Tests for Refractory Materials Intended for the Steel Industry - A Review

Microstructures and strengths of microporous MgO‐Al₂O₃ refractory aggregates using two types of magnesite

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

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Dynamic interaction of refractory and molten steel: Corrosion mechanism of alumina-magnesia castables

Cited by 50 publications

References 18 publications

Corrosion Tests for Refractory Materials Intended for the Steel Industry - A Review

Corrosion Tests for Refractory Materials Intended for the Steel Industry - A Review

Microstructures and strengths of microporous MgO‐Al2O3 refractory aggregates using two types of magnesite

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

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Microstructures and strengths of microporous MgO‐Al₂O₃ refractory aggregates using two types of magnesite