水熱ホットプレス法による高炉スラグを原料とした微細孔を有する固化体の作製および熱伝導率測定(高温プロセス基盤技術)

概要

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To produce insulating construction materials using hydrothermal reaction from blast furnace slag (BF slag) such as air-cooled, air granulated, and water-cooled slags, we investigated the fabrication of porous solidified materials from BF slag by a hydrothermal hot-pressing method. The thermal conductivity of the solidified materials was also investigated. The experimental conditions were; hydrothermal holding time from 0 to 120min, hydrothermal temperature from 250 to 350℃, hydrothermal pressure from 20 to 80MPa, and slag powder sizes less than 15μm, 39±24μm, 84±21μm, 178±72μm, 375±125μm and more than 500μm. It was found that growth of the hydrothermally reacted phase led to a higher density and higher thermal conductivity of the solidified materials. It was noteworthy that the thermal conductivity of the hydrothermal solidified materials became smaller when the size of the slag powder was larger. This was because the more porous structure introduced into the solidified materials resulted in a lower density of the solidified materials. It was also found that glassy slag such as water-cooled and air granulated slags can be solidified even if the size of the slag powder was more than 500μm.
社団法人日本鉄鋼協会の論文
2009-01-01