Tracer diffusivity of Ca45and electrical conductivity in CaO-SiO2 melts

Keller, Helmut; Schwerdtfeger, Klaus; Hennesen, K.

doi:10.1007/bf02653974

Cited by 50 publications

(28 citation statements)

References 6 publications

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“…These results represent reasonably well the structural properties of CaO-SiO 2 melts, which were restricted to the diffusion of Si and O ions by the formation of silica network structure in the melts. The calculated self-diffusion coefficients of Ca, Si and O ions are in good agreement with measured values by Keller et al [28][29][30] For the calculation of the degree of polymerization in CaO-SiO 2 melts, the fractions of oxygen species such as bridging (O ) oxygen were calculated as a function of composition. The cut-off distance between Si and O ions for the calculation of oxygen species was determined by minimum position of first peak in silicon-oxygen pair distribution function, g Si-O (r).…”

Section: )supporting

confidence: 85%

“…Figure 8 shows the calculated self-diffusion coefficients of Ca, Si and O ions as a function of composition at 1 873 K with observed results. [28][29][30] The calculated self-diffusion coefficients of each ion show the relationship D Ca ϾD O ϾD Si and decrease with increasing SiO 2 content in CaO-SiO 2 melts. These results represent reasonably well the structural properties of CaO-SiO 2 melts, which were restricted to the diffusion of Si and O ions by the formation of silica network structure in the melts.…”

Section: )mentioning

confidence: 92%

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Molecular Dynamics Simulation of the Thermodynamic and Structural Properties for the CaO-SiO2 System

Seo

Tsukihashi

2004

ISIJ International

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The thermodynamic, structural and transport properties for the CaO-SiO 2 system were calculated by molecular dynamics (MD) simulation using the pairwise potential model with partial ionic charges. The interatomic potential parameters were determined by fitting the physicochemical properties of calcium oxide and calcium silicates with experimentally measured results. The calculated structural properties such as the pair distribution functions and the fractions of bonding types (bridging, non-bridging and free oxygen) of oxygen with silicon atoms in CaO-SiO 2 melts were in good agreement with observed results, and also the self-diffusion coefficients of calcium, silicon and oxygen ions have been calculated at 1 873 K. The DH M , DS M and DG M for the CaO-SiO 2 system were calculated based on the thermodynamic and structural parameters obtained from MD simulation. The phase diagram for the CaO-SiO 2 system estimated by calculated Gibbs energy of mixing shows good agreement with observed result in the range above 50 mol% CaO and the liquid-liquid immiscibility region in the CaO-SiO 2 system have also been assessed by MD calculation.

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Section: )supporting

confidence: 85%

Section: )mentioning

confidence: 92%

Molecular Dynamics Simulation of the Thermodynamic and Structural Properties for the CaO-SiO2 System

Seo

Tsukihashi

2004

ISIJ International

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“…The overall diffusivity of any species can be determined simply by Fick's first law, [19] expanded for a multicomponent system, as shown in Eq. [4]. [4] The term D e denotes "effective diffusion coefficient," which is the experimentally measured diffusion coefficient.…”

Section: Correlation Between Diffusivity and Optical Basicitymentioning

confidence: 99%

“…[4]. [4] The term D e denotes "effective diffusion coefficient," which is the experimentally measured diffusion coefficient.…”

Section: Correlation Between Diffusivity and Optical Basicitymentioning

confidence: 99%

Multicomponent diffusion in molten slags

Dolan

Johnston

2004

Metall Mater Trans B

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A method for investigating the diffusion of metal cations in multicomponent slag systems was developed. This method used microprobe analysis and allowed the analysis of the diffusion of multiple species within a single system. This project focused on the diffusion behavior of manganese, iron, calcium, and silicon in silicate slags, in order to simulate industrial steel and ferromanganese production. The molecular structure of CaO-Al 2 O 3 -SiO 2 slags was investigated with Raman spectroscopy, and oxidation states of manganese and iron in slags of varying composition were determined. This study identified the variation in diffusivity of slag components with changes in composition and temperature of multicomponent slag systems. An empirical model based on the correlation between optical basicity and diffusivity was developed to predict the multicomponent diffusivity of ionic species in molten silicate slags. The model takes into account properties of the bulk slag and the network forming ability of the diffusing species. The relative rate of diffusion of metal cations is proportional to the optical basicity coefficient of that species, while the rate of diffusion of all species increases exponentially with the calculated optical basicity of the bulk slag.

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“…The principle applied is the same as that used for conductivity measurements in nonmetallic liquids. [10] The setup is shown in Figure 2. The resistance of the water between two wires, 10 mm apart, is measured, and depends on the immersion depth (L) according to R ϭ K/( w L), where w is the conductivity of the water.…”

Section: B Spout Heightmentioning

confidence: 99%

Dynamics of the spout of gas plumes discharging from a melt: Experimental investigation with a large-scale water model

Yonezawa

Schwerdtfeger

2000

Metall Mater Trans B

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In the present study, the spout region of a gas plume discharging from a melt has been investigated using a water model of 180 cm in height and 160 cm in diameter. The lateral movement of the spout, as measured optically, increases with the gas flow rate and has been found to be Ϯ 20-cm wide or wider, and very fast. The spout height, as measured with video-optical and electrical methods, strongly fluctuates with time. Clear definitions have to be made of the quantities to be determined in the highly dynamic process. Long-time averages of the radial height profiles and momentary maximum height values are reported. It is confirmed that the nondimensional spout height, defined and measured in a certain manner, is independent of the Froude number and of the nondimensional nozzle diameter.

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Tracer diffusivity of Ca45and electrical conductivity in CaO-SiO2 melts

Cited by 50 publications

References 6 publications

Molecular Dynamics Simulation of the Thermodynamic and Structural Properties for the CaO-SiO2 System

Molecular Dynamics Simulation of the Thermodynamic and Structural Properties for the CaO-SiO2 System

Multicomponent diffusion in molten slags

Dynamics of the spout of gas plumes discharging from a melt: Experimental investigation with a large-scale water model

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