Thermal Conductivity of the Molten CaO-SiO2-FeO
                x
               System

Kang, Youngjo; Nomura, Kiyoshi; Tokumitsu, Kazuto; Tobo, Hiroyuki; Morita, Kazuki

doi:10.1007/s11663-012-9706-7

Cited by 27 publications

(21 citation statements)

References 8 publications

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“…3,10,[24][25][26] Kang and Morita 23) measured the thermal conductivity in the CaO-SiO2-Al2O3 conventional iron-making slag system using the hot-wire method, reporting that the movement of phonons through covalent bonds is more effective than through ionic bonds in silicate melts; thus resulting in a higher thermal conductivity in more polymerized slag systems.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Molten Oxide Structure and Thermal Conductivity in the CaO–SiO2–B2O3 System

Kim

Morita

2014

ISIJ Int.

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Using a transient hot-wire method, the thermal conductivity of the CaO-SiO2-B2O3 mold flux system was measured. The effects of temperature, BO1.5 concentration and basicity on the thermal conductivity were considered, along with structural investigation by Raman spectroscopy. It was found that the addition of boron oxide caused both a decrement and increment of thermal conductivity, depending on the basicity. These conflicting effects on thermal conductivity were considered to be caused by the following two different behaviors in the oxide melts. Boron oxide is incorporated into silicate networks at a lower basicity, while it tends to form borate networks at higher CaO/SiO2 ratios. In the case of basicity dependency, thermal conductivity initially decreases or remains constant with increasing CaO/SiO2 ratio in regions of low basicity, but increases when the CaO/SiO2 ratio is higher than 1.15. Due to the incorporated state of boron oxide in silicate networks at low basicity, the thermal conductivity is likely to be predominantly affected by the silicate networks. However, at a relatively high CaO/SiO2 ratio, an increase in chain-type metaborate was observed through Raman spectroscopy; this structural change in borate being responsible for the increment in thermal conductivity with higher basicity. Finally, the apparent activation energy of thermal conductivity was calculated, and was found to be reduced by the addition of boron oxide.

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Section: Introductionmentioning

confidence: 99%

Relationship between Molten Oxide Structure and Thermal Conductivity in the CaO–SiO2–B2O3 System

Kim

Morita

2014

ISIJ Int.

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“…Considering the characteristics of each oxide, Mill suggested that the NBO/T value of a silicate melt can be estimated from its composition. 48) As with the basicity of the slag, the dependence of thermal conductivity on NBO/T in silicate melts is clearly shown in a number of published results, 33,48) as shown in Figs. 15 and 16.…”

Section: )mentioning

confidence: 81%

“…2,6,26,27,[30][31][32] Soon after, the hot wire method was also established for measuring the thermal conductivity of the CaO-Al2O3-SiO2, 7,[26][27][28] CaO-Al2O3-SiO2-MgO, 31) and CaO-SiO2-FeOx slag systems. 32,33) The fundamental measurement principle of the hot wire method can be described as follows: First, a thin thermoresistor wire is placed vertically in the middle of a molten sample. Under a constant supply of electric power, heat is then generated from the hot wire at a constant rate and transfers into the sample surrounding it mainly by conduction.…”

Section: Non-steady-state Methodsmentioning

confidence: 99%

Thermal Conductivity of Molten Slags: A Review of Measurement Techniques and Discussion Based on Microstructural Analysis

Kang¹,

Morita²

2014

ISIJ Int.

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In order to properly interpret the thermal conductivity of molten silicate slags, several different measurement methods are briefly reviewed, along with a discussion as to their respective advantages and limitations. In addition, a large number of thermal conductivity values measured by these methods are assessed, in order to evaluate their dependence on composition and temperature. The behavior of the thermal conductivity of molten silicate slags was found to show good agreement with well-focused analyses into its microstructure. Moreover, with an improved understanding of the microstructure of silicate slags, there is an apparent co-relation between thermophysical properties such as thermal conductivity, viscosity, and so forth.KEY WORDS: thermal conductivity; molten slag; silicate; hot-wire method; laser flash method.

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“…However, above the Debye temperature, owing to the approximately constant specific heat capacity (C) and mean particle velocity (v), the thermal conductivity of the oxide system decreases with increasing temperature as a result of the decrease in the phonon mean free path of collision (l), which is proportional to the inverse of the temperature (1/T). [25][26][27][28][29]31] Hence, it can be inferred that thermal conductivity reaches the maximum value around the Debye temperature, and then it decreases with higher temperatures. Therefore, identifying the Debye temperature in the oxide system is essential to evaluate the temperature at which thermal conductivity shows the maximum and to determine which variables mainly affect the thermal conductivity at the given temperature.…”

Section: Consideration Of One-dimensional Debye Temperature (θ D1 )mentioning

confidence: 99%

“…Although understanding the thermal conductivity of the molten oxide is also important for the thermal processing of the glass [22], the thermal conductivity measurement in the molten oxide system has been limited because of the large convection and the radiation effects [23]. However, owing to the several modifications of the non-steady state method, the thermal conductivity has been successfully measured in the molten oxide system over the last few decades [24][25][26][27][28][29][30][31][32][33]. Similar to other physical properties of the molten oxide system, the thermal conductivity is closely related to the network structure (i.e., silicate, aluminate, and borate structure.)…”

Section: Introductionmentioning

confidence: 99%

The effect of borate and silicate structure on thermal conductivity in the molten Na2O–B2O3–SiO2 system

Kim

Yanaba

Morita

2015

Journal of Non-Crystalline Solids

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Thermal Conductivity of the Molten CaO-SiO2-FeO x System

Cited by 27 publications

References 8 publications

Relationship between Molten Oxide Structure and Thermal Conductivity in the CaO–SiO2–B2O3 System

Relationship between Molten Oxide Structure and Thermal Conductivity in the CaO–SiO2–B2O3 System

Thermal Conductivity of Molten Slags: A Review of Measurement Techniques and Discussion Based on Microstructural Analysis

The effect of borate and silicate structure on thermal conductivity in the molten Na2O–B2O3–SiO2 system

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