NDLI: THERMAL CONDUCTIVITY OF THE Na 2 OSiO 2 AND THE CaO-Al 2 O 3-SiO 2 MELTS MEASURED BY HOTWIRE METHOD

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THERMAL CONDUCTIVITY OF THE Na 2 OSiO 2 AND THE CaO-Al 2 O 3-SiO 2 MELTS MEASURED BY HOTWIRE METHOD

Content Provider	Semantic Scholar
Author	Kang, Youngjo
Copyright Year	2009
Abstract	The thermal conductivity of some silicate melts including the CaO-Al2O3-SiO2 system, which is a typical blast furnace slag system, was measured in their pure liquid region using non-stationary hot-wire method. Initially, the thermal conductivity of the Na2O-SiO2 melts was measured up to 1473 K and the measurement results showed a good agreement to previous studies. Further measurements were carried out at various compositions in pure liquid region of the CaO-Al2O3-SiO2 system and iso-thermal conductivity line was drawn in iso-thermal sections at 1673 K, 1773 K, and 1873 K. Thermal conductivity drastically decreased as basicity increases when CaO/SiO2 ratio is smaller than unity, whereas it showed rather constant value when CaO/SiO2 ratio is larger. In the temperature range of interest, the thermal conductivity of each composition decreased as temperature rises. Temperature dependence in this study showed negative deviation from linearity with the reciprocal of absolute temperature, which has been conventionally understood to be valid to crystalline solid. The deviation was considered to be due to the thermally-induced deploymerization of the silicate structure at higher temperature. Infrared absorption analysis has confirmed the breakage of the silica tetrahedral structure as temperature rises. Furthermore, it could be well supported by a good linearity of the logarithm function of thermal conductivity against 1/T during deploymerization.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.pyrometallurgy.co.za/MoltenSlags2009/0171-Kang.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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