Corrosion Activity of Alkali-Containing Slags With Respect to a Blast Furnace Refractory Lining

Togobitskaya, D. N.; Khamkhot’ko, A. F.; Tsivataya, N. A.; Stepanenko, Dmytro

doi:10.1007/s11148-013-9568-9

Cited by 4 publications

(3 citation statements)

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“…These compounds react with alkali metals and zinc vapors and cause expansion and damage of refractory materials. [ 70–74 ] Jiao et al [ 21 ] studied the mechanism by which potassium, an alkali metal, damages carbon brick. Potassium vapor penetrates into the carbon brick through pores and cracks and then reacts with silicon dioxide and aluminum oxide to form potassium nepheline (K 2 O·Al 2 O 3 ·2SiO 2 ) and leucite (K 2 O·Al 2 O 3 ·4SiO 2 ).…”

Section: Erosion Mechanism Of Hearth Refractoriesmentioning

confidence: 99%

Erosion Behavior and Longevity Technologies of Refractory Linings in Blast Furnaces for Ironmaking: A Review

Cui

Wang

et al. 2022

steel research int.

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Erosion of the refractory materials in blast furnaces (BFs) greatly limits their campaign life, which seriously reduces the economic benefits of iron and steel plants and endangers workers. Therefore, it is important to detect and monitor the erosion process of refractory materials in the BF hearth. In this review, the mechanisms of physical damage, chemical corrosion, and mechanical erosion of BF hearths during BF operation are analyzed and summarized. In addition, the effects of hearth structure, refractory type, and protective layer on hearth erosion behavior and hearth life are analyzed and discussed. Some longevity technologies of BF hearths are analyzed and compared, such as reasonable hearth structure design, refractory selection, and technologies to form protective layers. Finally, some suggestions and prospects for the future development of long campaign life BF hearths are discussed.

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Section: Erosion Mechanism Of Hearth Refractoriesmentioning

confidence: 99%

Erosion Behavior and Longevity Technologies of Refractory Linings in Blast Furnaces for Ironmaking: A Review

Cui

Wang

et al. 2022

steel research int.

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“…The zinc vapor suffer oxidation, and then occurs its solidification and deposition in the isotherm near to 800ºC, Equation 1. raw materials in current use in this furnace it was founded that new corrosion agent are the elements zinc and sulfur.…”

Section: Region Around the Tap Holesmentioning

confidence: 99%

“…Refractories are materials that presents sufficient physical and chemical properties stability to be applied for structural purposes in equipment that works in high temperatures in the industries process 1 . To produce hot metal just a few refractories could be used.…”

Section: Introductionmentioning

confidence: 99%

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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