Hot metal corrosion behavior for graphite refractory impregnated with TiO2, ZrO2 carrying solutions

Vernilli, Fernando; Justus, S. M.; Mazine, A.; Baldo, J. B.; Longo, Elson; Varela, J. A.; Silva, S. N.

doi:10.1002/maco.200403859

Cited by 16 publications

(13 citation statements)

References 1 publication

(2 reference statements)

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“…The non-milled samples were conducted to Scanning Electronic Microscopy (SEM) with X-ray Spectrometry (EDS) 6,7,8,9,10,11 .…”

Section: Methodsmentioning

confidence: 99%

“…However, the corrosion mechanism is a result of the chemical nature of the raw materials used to produce hot metal wherein the alkali compound were the main degradation agents 7,8 . In 2000 the #2BF showed the typical wear profile configuration reported by the lecture along the refractory thickness, from the hot face to the cold face: Lost layer; Protective layer; Hot metal penetrated layer; Brittle zone; Slightly changed layer and Unchanged layer 8 . The goal of this present work is evaluate the current wear mechanisms that act over this refractory system.…”

Section: Introductionmentioning

confidence: 99%

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Blast Furnace Hearth Lining: Post Mortem Analysis

et al. 2017

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The main refractory lining of blast furnace hearth is composed by carbon blocks that operates in continuous contact with hot gases, liquid slag and hot metal, in temperatures above 1550 ºC for 24 hours a day. To fully understand the wear mechanism that acts in this refractory layer system it was performed a Post Mortem study during the last partial repair of this furnace. The samples were collected from different parts of the hearth lining and characterized using the following techniques: Bulk Density and Apparent Porosity, X-Ray Fluorescence, X-ray Diffraction, Scanning Electron Microscopy with Energy-dispersive X-Ray Spectroscopy. The results showed that the carbon blocks located at the opposite side of the blast furnace tap hole kept its main physicochemical characteristics preserved even after the production of 20x10 6 ton of hot metal. However, the carbon blocks around the Tap Hole showed infiltration by hot metal and slag and it presents a severe deposition of zinc and sulfur over its carbon flakes. The presence of these elements is undesired because it reduces the physic-chemical stability of this refractory system. This deposition found in the carbon refractory is associated with impurities present in the both coke and the sinter feed used in this blast furnace in the last few years.

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“…The non-milled samples were conducted to Scanning Electronic Microscopy (SEM) with X-ray Spectrometry (EDS) 6,7,8,9,10,11 .…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Blast Furnace Hearth Lining: Post Mortem Analysis

et al. 2017

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“…The evolutions of bulk and true densities of the specimens during heat treatment are illustrated in Figure 8. It is clear that the bulk density of specimens increased with the firing temperature and reached its maximum at 1400°C, which was 1.65 g/cm 3 ; it then declined down to 1.58 g/cm 3 at 1600°C. However, the true density increased slightly with temperature.…”

Section: Property Changesmentioning

confidence: 96%

“…Thereafter, the lining refractory layer is often eroded and damaged by various factors, such as the molten metal penetration, thermal stresses, carbon dissolution, carbon oxidation, alkalia attack, etc. [1][2][3][4][5][6] Thus, it has been of established consensus that the lifetime of a BF is mainly determined by the rate of erosion and corrosion of the hearth refractory lining.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature on the Properties and Microstructures of Carbon Refractories for Blast Furnace

Chen

et al. 2009

Metall Mater Trans A

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The effects of temperature on phase composition, microstructure, and properties of silicon-containing blast furnace (BF) carbon refractories after firing in coke breeze packing at 1000°C to 1600°C were studied with the aid of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray, mercury porosimetry, and a laser thermal conductivity meter. The results showed that silicon played a dominant role in the evolution of phase, microstructure, and properties. The amount of SiC whiskers increased with temperature. The phase in the outer part of the specimen was cristobalite balls, and its content decreased and b-SiC whisker increased in the inner part of the specimen. The phase and microstructure development with firing temperature influenced the properties. The bulk density, strength, and <1-lm micropore volume of open pores were highest, whereas the apparent and total porosity, mean pore size, and thermal conductivity were lowest for specimens fired at 1400°C. Moreover, the thermal conductivity was affected by pore structure and phases formed after firing.

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“…[37][38][39][40] ii) Provision of suitable coating techniques of carbon cellular structures, i.e. SiC-and/or YSZ coatings [41] in order to improve water wetting as for colloidal MgO-C brick processing and to decrease slag wetting behavior of tailored carbon matrices during high temperature operation. By that way it is intended to reduce wear by substantial prevention of slag and/or gas infiltration, to decrease thermal expansion at extreme temperature shift and to prevent redox reactions of carbon and carbon microstructure weakening at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Reinforced Cellular Carbon Matrix–MgO Composites for High Temperature Applications: Microstructural Aspects and Colloidal Processing

Silveira

Falk

2011

Adv Eng Mater

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The main potential of functionalized cellular carbon refractories is the considerable variation range of cell dimensions, cell geometries, i.e. spatial arrangement of interconnected carbon strut networks, as well as cell compositions, i.e. layered or multilayered cell conformations. In order to achieve this last goal, it will have to provide available post‐processing procedures to upgrade cellular carbon matrices for specific functions, i.e. tailored moduli of elasticity, thermal shock resistance, that cannot be technically or economically provided by conventional low carbon MgO–C refractories.1 Here we report different colloidal synthetic processing routes for tailoring reinforced cellular and reticulated glassy carbon structures in the macro‐, meso‐, and microscale, which then gives rise to very high thermal shock resistance characteristics. The cellular interconnected glassy carbon network is processed by replication of PU foams with phenolic resins and subsequent carbonization in inert atmospheres. In order to improve the water‐wettability of tailored glassy carbon cellular matrices and to ease the subsequent infiltration of aqueous MgO suspensions into open porous, cellular carbon structures a low cost YSZ, and SiC coating concept is proposed using an electrophoretic deposition (EPD) method and subsequent sintering in order to achieve the reinforcement of carbon phase, respectively. These as‐received wettable and reinforced coatings and functional layers on the interconnected cellular glassy carbon network are able to reliably allow the infiltration of aqueous MgO suspensions to build up low carbon functional C/SiC‐ as well as C/YSZ–MgO refractories with designed and controlled thermo‐mechanical properties.

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Hot metal corrosion behavior for graphite refractory impregnated with TiO2, ZrO2 carrying solutions

Cited by 16 publications

References 1 publication

Blast Furnace Hearth Lining: Post Mortem Analysis

Blast Furnace Hearth Lining: Post Mortem Analysis

Effect of Temperature on the Properties and Microstructures of Carbon Refractories for Blast Furnace

Reinforced Cellular Carbon Matrix–MgO Composites for High Temperature Applications: Microstructural Aspects and Colloidal Processing

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