蒸気養生による緑泥石-絹雲母-石英-セッコウー石灰系多孔質材料の製造に関する基礎的研究

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Utilization of mining wastes of Kuroko-type ore deposit has been attempted to prepare novel porous materials called KGL (Kuroko-Gypsum-Lime) by steam curing. Gypsum and slaked lime were added as reaction agents. The wastes comprise chlorite, sericite and quartz all associated with a small amount of barite. The mining wastes were calcined beforehand at various temperatures below 1000℃. Processing above 500℃ yielded very reactive pozzolana III-anhydrite converted from desulfuration gypsum or commercial hemihydrate was used as gypsum source in order to obtain consolidated precursors from slurry mixtures of the three raw materials in a short period of time. The precursors were steam-cured for 24 h under the conditions of 80℃ and 90% R.. H. Thus, water resistant porous materials with the lowest bulk density of 0.62g/cm^3 were prepared, depending on the W/S (weight ratio of water to solid). The resulting hydrates are gypsum and C-S-H. The gypsum showed acicular to lath-like morphology, when the wastes processed above 500℃ were used, whereas it showed irregular platy morphology, when the wastes processed below 400℃ were used. The elongated form of gypsum may be useful to strengthen the porous materials. The thermal conductivity values are dependent on the W/S, their lowest value being 0.14 kcal/m・h・℃. Consequently, KGL has a potential of practical use as heat and sound insulating materials, judging from the resulting thermal conductivity and bulk density.
社団法人日本セラミックス協会の論文
1990-12-01

蒸気養生による緑泥石-絹雲母-石英-セッコウー石灰系多孔質材料の製造に関する基礎的研究

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