Density Measurements of Mould Flux Slags by Electrostatic Levitation Method

Matsushita, Taishi; Ishikawa, Takehiko; Paradis, Paul‐François; Mukai, Kusuhiro; Seetharaman, Seshadri

doi:10.2355/isijinternational.46.606

Cited by 10 publications

(9 citation statements)

References 14 publications

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“…Density measurements of slag systems at high temperatures have been carried out by various methods, some of the most prominent being the Maximum bubble pressure method, [4] Pycnometric method, [5] Levitation method, [6] Sessile drop method, [7,8] and Archimedean method. [9] The CaO-SiO 2 -Al 2 O 3 ternary is the most extensively studied silicate system with several researchers carrying out density measurements at various compositions.…”

Section: Introductionmentioning

confidence: 99%

Density Measurements of Low Silica CaO-SiO2-Al2O3 Slags

Muhmood

Seetharaman

2010

Metall Mater Trans B

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Density measurements of a low-silica CaO-SiO 2 -Al 2 O 3 system were carried out using the Archimedes principle. A Pt 30 pct Rh bob and wire arrangement was used for this purpose. The results obtained were in good agreement with those obtained from the model developed in the current group as well as with other results reported earlier. The density for the CaO-SiO 2 and the CaO-Al 2 O 3 binary slag systems also was estimated from the ternary values. The extrapolation of density values for high-silica systems also showed good agreement with previous works. An estimation for the density value of CaO was made from the current experimental data. The density decrease at high temperatures was interpreted based on the silicate structure. As the mole percent of SiO 2 was below the 33 pct required for the orthosilicate composition, discrete SiO 4À 4 tetrahedral units in the silicate melt would exist along with O 2-ions. The change in melt expansivity may be attributed to the ionic expansions in the order ofStructural changes in the ternary slag also could be correlated to a drastic change in the value of enthalpy of mixing.

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Section: Introductionmentioning

confidence: 99%

Density Measurements of Low Silica CaO-SiO2-Al2O3 Slags

Muhmood

Seetharaman

2010

Metall Mater Trans B

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“…[87] In general, slag density can be determined by (a) numerical calculations based on previously established models [88] and (b) experimental methods, such as the sessile drop technique, [89] the Archimedes principle [90] or electrostatic levitation method. [91] One of the most well-known numerical methods for calculating density of a multicomponent slag in liquid state is based on calculation of partial molar volumes, [88] which are expressed as:…”

Section: Densitymentioning

confidence: 99%

Slag Properties in the Primary Production Process of Mn-Ferroalloys

Tangstad

Bublik

Haghdani

et al. 2021

Metall Mater Trans B

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The thermodynamic and kinetic properties of the carbothermic reduction of MnO in the five-component slag, MnO-SiO2-CaO-MgO-Al2O3, is critical in the production process of Mn-ferroalloys. While the reduction rate is mainly dependent on the presence of a solid MnO phase in the slag for Mn-Fe-alloys, the rate for the Mn-Si-Fe alloys has two distinct steps, a slow step followed by a fast step. The extent of the slow step has been shown to be dependent on the S content in the slag. The thermo-physical properties of viscosity, density, interfacial tension and electrical resistivity is reviewed, and these properties are mainly determined by the total basicity.

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“…Reasonable estimates can be obtained using partial molar volumes (V) for the various slag constituents but special procedures are There are few reported data for the density of mould slags. Values have been reported for the glassy phase [14][15][16] the liquid state 17,18) and for some slag films.…”

Section: Density (ρ) Thermal Expansion Coefficient (α)mentioning

confidence: 99%

“…17,18,[35][36][37][38][39][40] The model is based on a previous model 41) in which the following assumptions were made: (i) The various slag components were divided into, surfactants and bulk components. (ii) The surface tension of bulk components ( Fig.…”

Section: Surface Tension (γ) and Interfacial Tension (γ Msl )mentioning

confidence: 99%

Calculation of Physical Properties for Use in Models of Continuous Casting Process-Part 1: Mould Slags

et al. 2016

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Physical properties of both steels and mould slags are needed as input data for the mathematical modelling of the continuous casting process. Routines for calculating the properties of mould slags and for estimating steel properties have been developed and are described in Parts 1 and 2, respectively. Many mould powders, with differing compositions, are used in casting practice and their properties vary significantly. Reliable models have been developed to calculate these property values as a function of temperature from their chemical composition since this is available on a routine basis. Models have been developed to calculate the following properties: heat capacities, enthalpies, thermal expansion coefficient, density, viscosity, thermal conductivity and surface tension. Solid mould slags can exist as glassy or crystalline phases or as mixtures of the two (i.e. slag films) and the properties for the various phases can vary considerably; methods have been developed to calculate property values for these various states. The software used to calculate the properties is available via the link (i) http://www.mxif.manchester.ac.uk/ resources/software (ii) https://sites.google.com/site/shyamkaragadde/software/thermophysical-properties.KEY WORDS: mould slags; continuous casting; thermophysical properties; steels.carbonates decompose to form CO 2 (g) (ii) Carbon particles in the powder start to oxidise (iii) the oxide components sinter and (iv) then melt when the carbon is consumed, and molten globules mix to form a molten slag pool. Slag from the molten pool then infiltrates into the channel between the steel shell and the mould to form a slag film (Fig. 1); this consists of (i) a liquid layer (ca. 0.1 mm thick) and (ii) a solid layer (ca. 1-2 mm thick). The heat flux between shell and mould is determined, principally, by the thickness of this solid layer (and the amount of crystalline phase present) and the lubrication supplied to the shell is determined by the thickness of the liquid layer. Lubrication involves the following properties: viscosity (η), density (ρ) surface tension (γ) and break (or solidification) temperature (T br ). The heat flux involves the following properties of the mould slag: thermal conductivity (k), T br , the fraction of crystalline phase formed in the slag film (f crys ) and the optical properties of the mould slag.The objective of this study was to develop routines to provide reliable values of the thermo-physical properties of mould slags from their chemical compositions, for input into the model of the continuous casting process. The other aim was to make these routines available as Excel software; open access is provided at (i) http://www.mxif.manchester. ac.uk/resources/software (ii) https://sites.google.com/site/ shyamkaragadde/software/thermophysical-properties. Effect of Structure on Slag PropertiesThe properties of slags are principally determined by the structure of the slag. In silicate slags the basic building ISIJ International, Vol. 56 (2016)block is the Si-O tetrahedron, i...

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Density Measurements of Mould Flux Slags by Electrostatic Levitation Method

Cited by 10 publications

References 14 publications

Density Measurements of Low Silica CaO-SiO2-Al2O3 Slags

Density Measurements of Low Silica CaO-SiO2-Al2O3 Slags

Slag Properties in the Primary Production Process of Mn-Ferroalloys

Calculation of Physical Properties for Use in Models of Continuous Casting Process-Part 1: Mould Slags

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