乾燥および水熱条件下におけるFe-セピオライトの相変化について : Fe-セピオライトの鉱物学的研究・第3報

概要

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Phase transformations of Fe-sepiolite under dry and hydrothermal conditions were investigated. On dry heating, Fe-sepiolite was stable below 300℃. Above this temperature it converted to sepiolite-anhydride, and to enstatite at 900℃, in agreement with the results reported previously for Mgsepiolite. Under hydrothermal conditions, the specimen was treated in the temperature range from 250 to 550℃ at water vapor pressures of 250 and 500 kg/cm^2 for 120 hours. As the result, Fe-sepiolite is stable below 325℃. Above this temperature, it transforms into Fe-bearing talc (minnesotaite) with a small amount of hematite and cristobalite. This result differs from the results reported previously for Mg-sepiolite with respect to the formation of hematite and cristobalite.
日本粘土学会の論文
1991-11-20