Magnesite Refractories

McDowell, J. Spotts; Howe, Raymond M.

doi:10.1111/j.1151-2916.1920.tb18622.x

Cited by 16 publications

(5 citation statements)

References 26 publications

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“…On the other hand, frozen Ar material is a very soft solid due to the weak Ar-Ar binding. The melting point of Ar is 83.78 K [59], much lower than that of MgO around 3073 K [60]. The softness of the Ar material thus changes the energy balance to the extent that the Ar substrate takes up most of the impinging energy, leaving rather little internal excitation for the cluster itself.…”

Section: Mgo Versus Ar Substratementioning

confidence: 99%

Modeling of the deposition of Na Clusters on MgO(001)

et al. 2009

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We investigate the dynamics of deposition of small Na clusters on MgO͑001͒ surface. A hierarchical modeling is used combining quantum mechanical with molecular mechanical description. Full time-dependent density-functional theory is used for the cluster electrons while the substrate atoms are treated at a classical level. We consider Na 6 and Na 8 at various impact energies. We analyze the dependence on cluster geometry, trends with impact energy, and energy balance. We compare the results with deposit on the much softer Ar͑001͒ surface.

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Section: Mgo Versus Ar Substratementioning

confidence: 99%

Modeling of the deposition of Na Clusters on MgO(001)

et al. 2009

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“…Lesser uses are in the manufacture of magnesium oxychloride cement, magnesimn metal, and in the paper, cermnic, synthetic rubber, glass, insulation, and chemical industries. Details of processing of magnesite for these uses have been described by McDowell and Howe ( 1920), Comber ( 1937), Seaton (1942), and Harness and Jensen (1943). The first step in processing almost all magnesite is heating, or calcining, during which the bulk of the carbon dioxide is driven off, leaving a rmnainder consisting principally of magnesium oxide; the residue is known as "dead-burned magnesia," "periclase," or "caustic-calcined magnesia," depending on its purity and chemical reactivity.…”

Section: Magnesite Occurrencesmentioning

confidence: 99%

Magnesite deposits in the Serra das Eguas, Brumado, Bahia, Brazil

Bodenlos¹

1954

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Aluminum silicate and associated minerals____________________ Magnesite textures and their relation to deposition_________________ Chemical composition of magnesite______________________________ Lime_____________________________________________________ Silica____________________________________________________ Ironoxide________________________________________________ Alumina _____________________________ •_____________________ Manganeseoxide__________________________________________ Other impurities___________________________________________

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“…The final product can vary depending on the type of magnesite used and where it originated from. McDowell and Howe 1 describe two main types of magnesite: “crystalline” and “amorphous” (in reality, coarse and fine grained, respectively). Magnesite rock will often contain some amount of impurities, often iron oxide, calcium oxide, and silicate‐based compounds.…”

Section: Introductionmentioning

confidence: 99%

High temperature confocal scanning laser microscopy analysis of dead‐burned magnesia aggregates

Richards

Athavale

Smith

et al. 2023

Int J Ceramic Engine & Sci

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Dead‐burned magnesia is a commonly used material in the manufacturing of refractories for the steelmaking industry. Aggregates of dead‐burned magnesia contain secondary phases due to the impurities within the magnesite rock used in its production. While these phases can aid in sintering magnesia, they may have some impact on the high‐temperature performance of the refractory product. High‐temperature confocal scanning laser microscopy was utilized to observe the behavior of dead‐burned magnesia aggregates at elevated temperatures (up to 1550°C). Liquid formation was detected even at temperatures below 1350°C. In some cases, this liquid quickly exuded from the aggregate surface. This liquid phase was characterized through microscopy and chemical analysis to determine the impact of impurity content on the formation and behavior of this liquid phase, and conclusions are drawn on its detrimental impact on the material's refractoriness in a steelmaking environment.

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Magnesite Refractories

Cited by 16 publications

References 26 publications

Modeling of the deposition of Na Clusters on MgO(001)

Modeling of the deposition of Na Clusters on MgO(001)

Magnesite deposits in the Serra das Eguas, Brumado, Bahia, Brazil

High temperature confocal scanning laser microscopy analysis of dead‐burned magnesia aggregates

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