Influence of CaF2 in calcium aluminate-based slag on the degradation of magnesia refractory

Han, Jin Sung; Kang, Jin Gyu; Shin, Jae Hong; Chung, Yoonsun; Park, Joo Hyun

doi:10.1016/j.ceramint.2018.04.145

Cited by 29 publications

(6 citation statements)

References 29 publications

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“…Currently, effect of CaF 2 on the viscosity of highly basic CaO-Al 2 O 3 -SiO 2 -MgO-CaF 2 slags with C/S > 4 and Al 2 O 3 content in the order of 15%-20%, which could be used for the production of Al-killed duplex stainless steel with high cleanliness demand, has not been reported yet in the open literature. As already well known, excessive CaF 2 addition in metallurgical slags not only accelerates refractory corrosion 27) but also causes serious environmental issues. 28) Therefore, in this work, we studied the effect of CaF 2 content on the viscosity and refining ability of highly basic CaO-18%Al 2 O 3 -SiO 2 -10%MgO-CaF 2 (C/S = 6) slags and compared with the typical CaF 2 -free highly basic CaO-30%Al 2 O 3 -SiO 2 -10%MgO (C/S = 6) slag which is commonly used for the production of high cleanliness carbon steel, aiming at optimizing CaF 2 content.…”

Section: Introductionmentioning

confidence: 97%

Effect of CaF<sub>2</sub> on Viscosity and Refining Ability of Highly Basic Slags for Duplex Stainless Steel

Zheng

Wang

et al. 2021

ISIJ Int.

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To optimize CaF 2 content in highly basic CaO-18%Al 2 O 3-SiO 2-10%MgO-CaF 2 (%CaO/%SiO 2 = 6, denoted as C/S = 6) refining slags used for the production of Al-killed duplex stainless steel with high cleanliness demand, the effect of CaF 2 content on the viscosity and refining ability of the slags were studied and compared with typical CaF 2-free highly basic CaO-30%Al 2 O 3-SiO 2-10%MgO (C/S = 6) slag. The effect of CaF 2 addition in decreasing slag viscosity becomes less obvious with increasing temperature and CaF 2 content. When CaF 2 content exceeds 10%, slag viscosity only marginally decreases with further increasing CaF 2 content. Both monoxide-CaO and monoxide-MgO phases are precipitated in all the CaF 2-bearing slags. CaF 2 addition slightly increases monoxide-MgO precipitation, but dramatically decreases monoxide-CaO precipitation. Viscosities of the CaF 2-bearing slags were also theoretically calculated and good agreement with the measured values was observed. Moreover, the 6% CaF 2-bearing slag has very close viscosities above 1 833 K but much lower viscosities below 1 833 K, compared with the CaF 2-free highly basic slag. Further evaluation of the 6% CaF 2-bearing slag on steel cleanliness confirms that 6% CaF 2 addition is sufficient for the highly basic CaO-18%Al 2 O 3-SiO 2-10%MgO-CaF 2 (C/S = 6) slag. The mechanism of CaF 2 in decreasing the viscosity of CaF 2-bearing slags was discussed from the viewpoints that CaF 2 behaves as a network breaker and that CaF 2 suppresses the precipitation of solid phases. The first aspect was identified to play a much greater role in decreasing slag viscosity.

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Section: Introductionmentioning

confidence: 97%

Effect of CaF<sub>2</sub> on Viscosity and Refining Ability of Highly Basic Slags for Duplex Stainless Steel

Zheng

Wang

et al. 2021

ISIJ Int.

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“…Moreover, several studies indicated that the viscosity of molten is of vital importance to the penetration behavior and changed during the smelting process, which is significant to help to understand the internal relationship among the chemical composition, physical property, and corrosion ability of the molten slag. [ 26,27 ] The viscosity decreases with the FeO content, meaning that the physical erosion of molten slag to the refractory is more serious when the FeO content of slag is high.…”

Section: Resultsmentioning

confidence: 99%

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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“…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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Influence of CaF2 in calcium aluminate-based slag on the degradation of magnesia refractory

Cited by 29 publications

References 29 publications

Effect of CaF<sub>2</sub> on Viscosity and Refining Ability of Highly Basic Slags for Duplex Stainless Steel

Effect of CaF<sub>2</sub> on Viscosity and Refining Ability of Highly Basic Slags for Duplex Stainless Steel

Corrosion Behavior of MgO–C Ladle Refractory by Molten Slag

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

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