Ceramics, Refractories, and Glasses

Cardarelli, François

doi:10.1007/978-3-319-38925-7_10

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…The calcined grains appears as agglomerate of α -alumina crystallites which are bigger when temperature of calcination is higher. The α -alumina crystallites have porous vermicular or wormy structure, as also found by other researchers (Cardarelli 2008; Yang et al 2009; Wang et al 2015). In the UC1150-2 sample (Figure 11(a, b)), due to large particle size and low calcination temperature, in some areas (denoted as A) α -alumina crystallites were not formed, but in the UC1300-2 sample (Figure 11(c, d)), although the gibbsite particle size was large, due to the higher calcination temperature α -alumina crystallites were fully formed in all areas of the sample, which corresponds to their XRD patterns (Figure 10(a, c)).…”

Section: Resultssupporting

confidence: 83%

“…Gibbsite, Al(OH) 3 , a common polymorph of aluminium trihydroxide, is produced commercially from bauxite by the Bayer process and is used as a precursor for the manufacture of α -alumina powder (Cardarelli 2008; Lee et al 1996). The gibbsite precipitated in the Bayer process from seeded sodium aluminate solutions often occurs as agglomerates of tabular and hexagonal shaped crystals (Lee et al 1996).…”

Section: Introductionmentioning

confidence: 99%

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The relation between particle size and transformation temperature of gibbsite to αLPHA-alumina

Ahmadabadi

Nemati

Arzani

et al. 2020

Mineral Processing and Extractive Metallurgy

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The transformation of gibbsite to α-alumina occurs in the range 1100 to 1300°C. The higher the calcination temperature, the larger the crystallites and this leads to abnormal grain growth. The main goal of this research was to reduce the transformation temperature of gibbsite to αalumina by reducing the gibbsite particles size. The sodium content of the gibbsite used in the study was reduced to less than 0.1% by washing it in HCl solution. It was then ground in a fast mill at ambient conditions for different times then calcined at different temperatures. The microstructure, particles size and thermal behaviour of the samples were examined with SEM, XRD, XRF, PSA and STA, respectively. In a sample ground for 180 min, the transformation temperature decreased from about 1300°C to 1150°C. The reduction in the calcination temperature led to a reduction in α-alumina crystallite size from about 77.16 nm to 64.37 nm.

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Section: Resultssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

The relation between particle size and transformation temperature of gibbsite to αLPHA-alumina

Ahmadabadi

Nemati

Arzani

et al. 2020

Mineral Processing and Extractive Metallurgy

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“…Materials used in furnaces must withstand the adverse conditions during the operation at high temperatures required to produce metals, which include: (i) corrosion and erosion by solids, liquids, fumes, and gases; (ii) thermo-mechanical loads generated in different parts of the furnace [ 1 , 2 , 3 , 4 , 5 ]. Refractory ceramics are used with this aim in the refractory lining of furnaces, and, within this context, around 70% of the worldwide refractory production is used by the metallurgy industry [ 2 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

MgO–ZrO2 Ceramic Composites for Silicomanganese Production

et al. 2022

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The deterioration of the refractory lining represents a significant problem for the smooth operation in the ferroalloys industry, particularly in the production of silicomanganese, due to the periodic requirements of substitution of the damaged refractory. Within this context, magnesia refractories are commonly employed in the critical zones of the furnaces used in silicomanganese production since the slag involved in the process has a basic character. The behavior of MgO–ZrO2 ceramic composites with different ZrO2 nanoparticles (0, 1, 3, and 5 wt.%) contents in the presence of silicomanganese slags is proposed in this manuscript. XPS, XRD and SEM–EDX were used to evaluate the properties of the ceramic composite against the silicomanganese slag. The static corrosion test was used to evaluate the corrosion of the refractory. Results suggest that corrosion is controlled by the change in slag viscosity due to the reaction between CaZrO3 and the melted slag. Besides, ZrO2 nanoparticles located at both triple points and grain boundaries act as a barrier for the slag advance within the refractory. The utilization of MgO refractories with ZrO2 nanoparticles can extend the life of furnaces used to produce silicomanganese.

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“…Este tratamiento agresivo le permite al material contraer y ser menos reactivo que la doloma. Este producto resultante se denomina dolomita calcinada a muerte ("burnt calcined dolomite") (Cardarelli, 2008). La microestructura consiste de una matriz de calcia con cristales embebidos de magnesia (escrito como CaO•MgO), como puede apreciarse en la siguiente micrografía (Figura 9): Figura 9.…”

Section: Comportamiento Térmicounclassified

Dolomía y dolomita: un abordaje desde las perspectivas geológica, cerámica y refractaria

Resio

2023

Tesla rev. cient.

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En el presente trabajo de revisión se propone llevar adelante un análisis de la bibliografía relacionada al mineral dolomítico. El estado del arte de las dolomías indica al presente un uso creciente como material refractario debido a la alternativa más económica que representa en comparación con otros materiales como lo es el óxido de magnesio. La importancia de la dolomía aparte de su aplicación en la industria siderúrgica radica en que se ha expandido a otros campos industriales como lo es la producción de catalizadores, soportes de catalizadores, y materiales de depuración de efluentes industriales. La revisión se ha llevado a cabo extrayendo la síntesis de trabajos de investigación desde 1924 al presente, desde tres perspectivas: geológica, cerámica y refractaria, puesto que las revisiones de dolomía sólo analizan los aspectos refractario o geológico en forma separada. Dado este marco, se hace necesario un documento que agrupe las áreas mencionadas.

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Ceramics, Refractories, and Glasses

Cited by 5 publications

References 11 publications

The relation between particle size and transformation temperature of gibbsite to αLPHA-alumina

The relation between particle size and transformation temperature of gibbsite to αLPHA-alumina

MgO–ZrO2 Ceramic Composites for Silicomanganese Production

Dolomía y dolomita: un abordaje desde las perspectivas geológica, cerámica y refractaria

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