Decarbonization of periclase-carbon refractories during heat treatment of the linings of steel-pouring ladles

Temlyantsev, M. V.; Матвеев, М. В.

doi:10.1007/s11015-010-9335-9

Cited by 4 publications

(3 citation statements)

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“…6,7 The oxidation of the MgO-C refractory lining showed a strong dependence with temperature, holding temperature and experiment time. 8,9 Oxy-combustion is a favorable technology for fuel savings and a solution of many environmental problems, for example, the reduction in CO 2 and NOx emissions, and many papers published in this area [10][11][12] document its importance. Instead of air used in conventional combustion, oxy-combustion uses high purity oxygen (>95%).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of oxidation resistance of MgO‐C bricks in oxy‐combustion and air‐combustion

Zanotelli

Ribas

Bragança

2021

Int J Applied Ceramic Tech

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There are important advantages in oxy-fuel technology over conventional combustion, such as the reduction in fuel consumption and gaseous emissions. However, before its use in the steel industry, it is essential to know that the alteration of the firing system can lead to an increase in the wear of the oxide-carbon refractories. In the present work, four types of MgO-C bricks were fired under oxy-fuel and air-fuel conditions in a semi-industrial furnace, simulating the heating of a steelmaking ladle.The fired bricks were evaluated in terms of weight loss, thickness of the decarburized layer, and phases and microstructure formed in this layer. The results indicated few differences in the properties of the bricks fired in the two systems. The brick with 12% carbon and Al antioxidant showed the highest oxidation resistance among all bricks investigated. The most important factor for the use of the oxy-fuel system was the correct selection of the refractory microstructural properties, including the utilization of antioxidant additives.

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Section: Introductionmentioning

confidence: 99%

“…The reaction rate was controlled by oxygen diffusion through solid material and pores in the decarburized layer 6,7 . The oxidation of the MgO‐C refractory lining showed a strong dependence with temperature, holding temperature and experiment time 8,9 …”

Section: Introductionmentioning

confidence: 99%

Evaluation of oxidation resistance of MgO‐C bricks in oxy‐combustion and air‐combustion

Zanotelli

Ribas

Bragança

2021

Int J Applied Ceramic Tech

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“…Наиболее интенсивно обезуглероживание происходит при первом разогреве новой футеровки, поскольку на ее поверхности отсутствуют остатки металла и шлака, препятствующие свободному доступу газов-окислителей к огнеупорам. Как показывают проведенные ранее исследования глубина обезуглероженного слоя после первого разогрева футеровки сталеразливочных ковшей может достигать 8 - 10 мм, а в некоторых случаях и более [4,5]. Поскольку обезуглероженный слой огнеупоров характеризуется более высокими пористостью, смачиваемостью металлом и шлаком, пониженными эксплуатационными свойствами, его разрушение происходит гораздо быстрее, чем огнеупора с исходным количеством углерода.…”

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Research on High-Temperature Decarburizationof Alum- Periclase-Carbon Ladle Refractories

Протопопов¹,

Темлянцев²,

Запольская³

et al. 2015

Izv. vysš. učebn. zaved., Čern. metall.

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Decarburization of periclase-carbon and aluminum-periclase-carbon ladle refractories

Yakushevich

Zapol’skaya

Temlyantsev

et al. 2022

Izv. vysš. učebn. zaved., Čern. metall.

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In this paper, the processes of decarburization of periclase-carbon and aluminum-periclase-carbon ladle refractories were investigated. Decarburization processes take place already at the stage of drying and heating the lining after repair, during its heat treatment on gas or electric stands. These processes cause irreparable damage to refractories even before the ladle is put into direct operation (before contact with molten steel). One of the ways to increase resistance of carbon-containing refractories against oxidation is the use of antioxidants (Al, SiC, Si, etc.), which are introduced into the composition of the raw mixture at the manufacturing stage. Their action is based on priority oxidation compared to carbon. Antioxidants act in a certain temperature range, which opens up wide opportunities for development of energy- and resource-saving temperature modes for lining heat-treatment. The authors made mogravimetric analysis of periclase-carbon and aluminum-periclase-carbon non-ignited resin-bonded refractories of AMC 78-8/7HG, RI-MC175LC (RI); MayCarb 284-AX (MAYERTON) grades used in the execution of working layers of steel ladle linings. Thermogravimetric analysis of refractory samples was carried out on a LABSYS evo TG DTA DSC 1600 derivatograph when heated to a temperature of 1100 °C at a speed of 15 °C/min. X-ray phase analysis was performed on an XRD-6000 X-ray diffractometer. The results of thermogravimetric analysis are presented in the form of derivatograms. It was established that the maximum rate of carbon oxidation in all cases is reached at a temperature of 700 – 750 °C. Therefore, in order to implement a low-carbonizing first heating of the ladle after repair, temperature modes are recommended for refractories of the studied brands, including low-temperature (up to 500 °C) lining exposure.

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Decarbonization of periclase-carbon refractories during heat treatment of the linings of steel-pouring ladles

Cited by 4 publications

References 1 publication

Evaluation of oxidation resistance of MgO‐C bricks in oxy‐combustion and air‐combustion

Evaluation of oxidation resistance of MgO‐C bricks in oxy‐combustion and air‐combustion

Research on High-Temperature Decarburizationof Alum- Periclase-Carbon Ladle Refractories

Decarburization of periclase-carbon and aluminum-periclase-carbon ladle refractories

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