Properties of lime and lime-periclase refractories on a ceramic binder

Gropyanov, V. M.; Vezikova, R. M.; Kuznetsov, G. I.

doi:10.1007/bf02226985

Cited by 4 publications

(1 citation statement)

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“…After reducible process, it can be concluded that temperature loads of molten steel on the circumferential wall are equal. On the same horizontal line, the lateral pressure that exerted by gravity of molten steel is equal, as the depth increases; it increases accordingly [11][12][13]. The heat of molten steel has been reduced to a very small part by the thermal resistance of the working and permanent layers, the heat loss have been reduced to a very small part, the shell mainly plays the role of load-bearing.…”

Section: Finite Element Modelingmentioning

confidence: 99%

Archives of Metallurgy and Materials

Chang¹,

Li²,

Liu³

et al. 2018

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Based on the theory of heat transfer, the influence of expansion joints on the temperature and stress distribution of ladle lining is discussed. In view of the current expansion joint, the mathematical model of heat transfer and the three dimensional finite element model of ladle lining brick are established. By analyzing the temperature and stress distribution of ladle lining brick when the expansion joints are in different sizes, the thermal mechanical stress caused by the severe temperature difference can be reduced by the suitable expansion joint of the lining brick during the ladle baking and working process. The analysis results showed that the thermal mechanical stress which is caused by thermal expansion can be released through the 2 mm expansion joint, which is set in the building process. So we can effectively reduce the thermal mechanical stress of the ladle lining, and there is no risk of steel leakage, thus the service life of ladle can be effectively prolonged.

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Section: Finite Element Modelingmentioning

confidence: 99%

Archives of Metallurgy and Materials

Chang¹,

Li²,

Liu³

et al. 2018

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Sintering and properties of calcium monoxide

Kuznetsov

Gropyanov

et al. 1998

Refract Ind Ceram

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A High-Density Water-Resistant Magnesia-Lime Material Based on Dolomite

et al. 2005

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A method for preparation of water-resistant magnesia-lime granules of high density (95 -98%) is developed using dolomites and dolomitized magnesites. The use of granulated materials for manufacture of water-resistant clinker, powders, and magnesia-lime refractories with superior performance and economical characteristics is discussed.In recent years, much interest has been focused on the development of water-resistant materials using free calcium oxide [1 -5]. Dolomite from the Ekaterininskoe deposit (city of Krasnoyarsk) for fabrication of water-resistant granulated magnesia-lime materials was used. The dolomite composition was, %: MgO, 22.0 -24.5; CaO, 28.5 -30.5; Al 2 O 3 , 0.07 -0.25; SiO 2 , 0.22 -0.95; Fe 2 O 3 , 0.16 -0.45; MnO, 0.07 -0.10; Dm calc , 45.0 -46.8.A differential thermal analysis was used to examine the decarbonization of dolomite (Fig. 1). The onset of decarbonization was recorded at 500°C, and the end, at 900°C. The decarbonization was carried out in two steps.Step 1 was decarbonization of MgCO 3 (the onset at 500, the end at 770°C; Dm calc = 22.09%), and step 2 was decarbonization of CaCO 3 (onset at 770°C, complete decarbonization at 900°C; Dm calc = 46.77%).To prepare granules with a density close to theoretical (3.35 -3.39 g/cm 3 ), a sintering aid was added to the precursor mixture (calcined dolomite from the Ekaterininskoe deposit, stepwise hydrated with controlled amount of water to yield Mg(OH) 2 and Ca(OH) 2 ). The specimens were pelletized using a hydraulic press under a pressure of 40 MPa. The granules had the shape of a cylinder of diameter 15 and length 15 mm, or of an ellipsoid (with major axis not exceeding 20 mm and a major-to-minor axis ratio of 1.1 -2.0); the compressive strength of green granules was 2 -3 MPa. The granules were first sintered in a muffle furnace at 900°C and then in a vacuum furnace at 1750°C (granules 1) and under nitrogen at 1800°C (granules 2); the heating rate was 20 K/min. The calcined granules retained the initial dimensions and showed no visible imperfections. The granulated material was tested for open porosity P op , apparent density r ap , and compressive strength s c . Relevant data are given in Table 1.Using x-ray phase analysis techniques, the major components MgO and CaO (a sum total of 97.8%) were identified in the granules, with the occasional occurrence of alite crystals. The petrographic analysis data showed the granules to be composed of a uniform matrix of free CaO, with embedded individual crystals of periclase of irregular isometric or

show abstract

Properties of lime and lime-periclase refractories on a ceramic binder

Cited by 4 publications

References 0 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Sintering and properties of calcium monoxide

A High-Density Water-Resistant Magnesia-Lime Material Based on Dolomite

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