Improvement of corrosion resistance of spinel-bonded castables to converter slag

Mukhopadhyay, Siddhartha; Pal, Tapan Kr.; Daspoddar, P. K.

doi:10.1016/j.ceramint.2007.11.008

Cited by 18 publications

(2 citation statements)

References 15 publications

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“…Moreover, they are stable, with high corrosion resistance to various metals and their slags. Many researchers have focused on testing the corrosion resistance of refractory ceramics to different corrosive media on magnesia or spinel refractory ceramics with positive results [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of Novel Fly Ash-Based Forsterite-Spinel Refractory Ceramics

Nguyen

Sokolar

2022

Materials

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This article aims to investigate the corrosion resistance of novel fly ash–based forsterite–spinel (Mg2SiO4-MgAl2O4) refractory ceramics to various corrosive media in comparison with reactive alumina–based ceramics. Because fly ash is produced in enormous quantities as a byproduct of coal-burning power stations, it could be utilized as an affordable source of aluminum oxide and silicon oxide. Corrosion resistance to iron, clinker, alumina, and copper was observed by scanning electron microscope with an elemental probe. The influence on the properties after firing was also investigated. Fly ash–based and reactive alumina–based mixtures were designed to contain 10%, 15% and 20% of spinel after firing. Raw material mixtures were sintered at 1550 °C for two hours. X-ray diffraction analysis and scanning electron microscopy were used to analyze sintered samples. The apparent porosity, bulk density, modulus of rupture, and refractory and thermo–mechanical properties were also investigated. The experimental results disclosed that the modulus of rupture, thermal shock resistance and microstructure were improved with increasing amounts of spinel in the fired samples. An analysis of the transition zones between corrosive media and ceramics revealed that all mixtures have good resistance against corrosion to iron, clinker, aluminum and copper.

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Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of Novel Fly Ash-Based Forsterite-Spinel Refractory Ceramics

Nguyen

Sokolar

2022

Materials

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“…The penetration and corrosion process of slag is considered to be a very complicated physical chemistry one. Many studies have been carried out to investigate the slag penetration and slag corrosion mechanisms of the corundum based material [4][5][6][7], and most researchers agree that slag penetrates into the material through cracks, apparent pores, boundaries of matrix and grains, as well as the intergranulars. As molten slag penetrating into the material, the slag can react with the material and makes the grains and matrix of the material dissolve into the molten slag, then the microstructure of the material can be deteriorated.…”

Section: Introductionmentioning

confidence: 99%

Influences of Commercial SiC and Al<sub>2</sub>O<sub>3</sub>-SiC Synthesized from Clay on the Slag Resistance of Corundum Material

Yue

Zhu

Sun

et al. 2010

AMR

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The corundum based material was prepared, with fused white corundum, commercial SiC powder and superfine Al2O3-SiC powder synthesized from clay by carbothermal reduction reaction as raw materials. The influences of SiC and Al2O3-SiC powders on the slag penetration and corrosion resistance of the material were investigated, and the slag resistance mechanisms of the additives were also discussed. It was found that the slag resistance of the corundum material by adding Al2O3-SiC and SiC powders could be improved obviously. For improving the slag resistance of the corundum material, adding Al2O3-SiC was much better than adding commercial SiC. When the Al2O3-SiC powder contacted with the molten slag, Al2O3 in the additive could be dissolved into the molten slag immediately, while SiC remained, which caused the viscosity of molten slag to be increased. So, the slag penetration and slag corrosion into the corundum material could be effectively inhibited.

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Nanomaterials in refractory technology

et al. 2010

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A short review is presented of prospects for using nanomaterials in various refractory technologies, and an estimate is given of existing and future directions of their use for improving the operating properties of refractories. The possibility of controlling material properties at the atomic level makes it possible to create new innovative refractory materials and technology.The main stimulus in the development of the contemporary refractory industry is improvement of existing and the development of new high-temperature technology with even more severe specifications for refractory operating conditions, i.e. temperature, chemical erosion, mechanism, etc.Here the task of improving the service properties of refractories is inseparably connected with the question of reducing the cost of production, observation of ecological standards, the possibility if utilizing waste products, and recycling refractories.The requirement for finding comprehensive solutions has led to use in the majority of heating units, in particular ferrous metallurgy, of complex multicomponent composite materials, including oxide ceramics, metals and carbon. During the last thirty years significant success has been achieved in optimizing the physicochemical properties and chemical composition of these refractories for specific operating conditions. Currently the main areas of development include a change-over to controlling the refractory properties for an evermore finer size level, since the microstructure of any material is mainly determined by occurrence within it of different physicochemical processes.In view of this use in refractories of highly-(0.1 -1 mm) and nanodispersed (10 -100 nm) systems with a controlled composition and morphology is very important. In fact, the refractory branch, for tens of years and thousand of tons of consumed technical grade carbon (soot) and silica (microsilica, aerosil) is already one of the largest world users of nanomaterials. Development of new refractory technology has a favorable effect on formation of the market for new industrial nanomaterials, stimulating an increase in the volume of their production and a reduction cost.Interest in this class of materials is due to the possibility of a marked change in properties of normal substances by converting them to a nanosize condition [1]. An increase in the relative proportion of atoms or molecules, that are at the surface of particles, leads to an increase in the contribution of surface energy in practically all physicochemical processes of nanodispersed system reaction with the surroundings. Such a change, important from the point of view of dispersed refractory systems, may be a reduction in the melting and sintering temperatures, an increase in chemical activity and the rate of occurrence of chemical reactions, the possibility of preparing alloys, compounds and composites, impossible in traditional materials from a thermodynamic point of view. In turn, an increase in the relative interphase surface of bulky compacted refractories leads to a marked impro...

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Improvement of corrosion resistance of spinel-bonded castables to converter slag

Cited by 18 publications

References 15 publications

Corrosion Resistance of Novel Fly Ash-Based Forsterite-Spinel Refractory Ceramics

Corrosion Resistance of Novel Fly Ash-Based Forsterite-Spinel Refractory Ceramics

Influences of Commercial SiC and Al<sub>2</sub>O<sub>3</sub>-SiC Synthesized from Clay on the Slag Resistance of Corundum Material

Nanomaterials in refractory technology

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