Influence of the magnesium-oxide content on the refining properties of converter slag

Бабенко, А. А.; Krivykh, L. Yu.; Levchuk, V. V.

doi:10.3103/s0967091210040042

Cited by 4 publications

(4 citation statements)

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“…Crucibles slag resistance estimation.The experimental results confirmed the fact that the more MgO in the slag, the less the lining dissolves[3,5]. The maximum corrosion of the lining, that is, the crucible wall thickness decrease (table 1,Fig.…”

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confidence: 62%

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Efficiency Estimation of the Bacal Siderites Using to Increase Stability of Steel-Melting Agregates Lining

Gulyakov

Vusikhis

Chentsov

2020

Kms

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During the melting processes in steel-melting aggregates, lining destruction takes place due to the Magnesium oxide of lining dissolution in slag. In this study, different materials containing Magnesium oxide have been introduced into slag to increase lining stability. Efficiency estimation of raw siderite (10-0 mm class) using for this aim is considered in the present work. Initial slag (basic capacity СаО/SiO2=2,1) of industrial ASM (Arc Steel Melting) was corrected by high magnesia introduction additives (siderite). Slag has been loaded into a magnesia crucible, heated up to 1700∘C, aged during 1 hour and cooled with the furnace. The final slag phase composition analysis detected considerable changes in it: increase of MeO-phase refractory with MgO prevalence (melting temperature 2800 ∘С) and replacement of monocellitic silicate component (CaO⋅MgO⋅SiO2, melting temperature 1498 ∘С) by larnite (β-2CaO ⋅SiO2 melting temperature 2130 ∘С). Crucible slag resistance was estimated by thinning of it walls. Experiment results confirmed affect of MgO content in slag to linings solubility in it. It was determined that siderite additives increase MeO-phase (melting temperature more than 2000 ∘С) content in slag approximately by 30 % that is rather essential for lining service period increasing. It is confirmed that siderite additives prolongate magnesia lining stability of steel-making aggregates. Keywords: Bacal siderite, refractory lining, steel-making aggregates, crucible, monocellit, magnesia

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confidence: 62%

“…During the melting process in steelmaking aggregates, its linings have been destroyed. This is mainly due to the dissolution of refractory materials in Magnesium oxide slag [5]. To increase the lining stability, various materials containing Magnesium oxide have been added to the slag.…”

Section: Technogen-2019mentioning

confidence: 99%

Efficiency Estimation of the Bacal Siderites Using to Increase Stability of Steel-Melting Agregates Lining

Gulyakov

Vusikhis

Chentsov

2020

Kms

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“…To define the saturation concentration of MgO, three models can be found in literature . Phase diagram calculations are required to define the saturation concentration of CaO in the converter slag.…”

Section: Description Of the Bof Process Modelmentioning

confidence: 99%

Thermodynamic and Kinetic Model of the Converter Steelmaking Process. Part 1: The Description of the BOF Model

Lytvynyuk

Schenk

Hiebler³

et al. 2013

steel research int.

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A new model for the simulation of the converter steelmaking process was developed after the detailed study of existing thermodynamic and kinetic models and approaches. This model consists of the reaction model and models for charge materials melting and dissolution. The reaction model is based on the coupled reaction model, which includes the combination of both thermodynamics and kinetics of the involved phases. The models of charge material melting and dissolution include the definition of the driving force for the melting and dissolution, and the mass transfer coefficients in the metal and slag phases.

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“…The phosphorus equilibrium concentration in metal beneath magnesia slags was determined using a model described in [5]. Results of simulating the effect of degree of saturation (MgO) p /(MgO) s for slags of the oxidation period with magnesium oxide on refining properties are presented in Table 2.…”

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confidence: 99%

Set of Production and Engineering Solutions for Reducing Energy and Material Consumption of Semifinished Steel Melting in Contemporary Electric Arc Furnaces

et al. 2014

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Development and assimilation of a production method for smelting periods in an EAF with rational composition magnesia slags are described. A set of engineering methods for improving EAF operating efficiency is developed and introduced. Keywords: steel melting electric arc furnace, magnesia slags, slag viscosity, slag foaming.Currently, one of the main trends for improving production technical and economic indices in electric steel making is smelting steel in contemporary EAF under magnesia slags [1][2][3]. The technology provides an increase in furnace lining life due to a reduction in slag corrosive action on refractories, and an increase in the efficiency of using arc power due to early formation of a stable slag foam. According to authors of an article [3], operation under magnesia slags reduces energy consumption by 3-10% and for refractories by 25-63%.Important slag properties that affect its foaming capacity are chemical composition, basicity, viscosity, surface tension, and presence of suspended solid particles, which may be centers of gas bubble generation and stabilize foam. In order to determine optimum slag composition providing foaming, the authors in [2, 3] recommend the use of those compositions that in phase transformation diagrams correspond to a region with magnesia wustite and larnite. These slags will not only foam well during carbon blowing, but also will be entirely compatible with magnesia refractories.Lime was used as the main slag forming material in the period of assimilating steel smelting technology in the 135-ton EAF of the Severskii Pipe Plant (STZ) electric steel smelting workshop. The slag smelting regime was provided with an overall lime consumption per melt of 5 tons added by two methods: 2.5 tons on reaching electric power consumption of 6 MW·h, and 2.5 tons with consumption of 19 MW·h. In these melting periods, carbon containing material was added to the EAF bath, i.e., anthracite in an amount of 1.1 and 0.9 tons, respectively.Implementation of a two-stage regime of lime addition provided the formation of slags of the oxidation period with basicity 2.3, containing on average 28.6% CaO, 25.7% FeO, and 4.3% MgO. Slags of this composition, exhibiting quite good

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Influence of the magnesium-oxide content on the refining properties of converter slag

Cited by 4 publications

References 1 publication

Efficiency Estimation of the Bacal Siderites Using to Increase Stability of Steel-Melting Agregates Lining

Efficiency Estimation of the Bacal Siderites Using to Increase Stability of Steel-Melting Agregates Lining

Thermodynamic and Kinetic Model of the Converter Steelmaking Process. Part 1: The Description of the BOF Model

Set of Production and Engineering Solutions for Reducing Energy and Material Consumption of Semifinished Steel Melting in Contemporary Electric Arc Furnaces

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