化学処理によるモルデンフッ石系凝灰岩の物理化学的特性の変化(第1報) : 水酸化ナトリウム溶液処理による影響

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The effect of alkali treatment on some physico-chemical properties of mordenite tuff was investigated with powder X-ray diffraction, chemical analyses, measurement of CO_2 adsorption and gaschromatography. Mordenite tuff from Shirasawa. Miyagi-cho, Miyagi Pref., was used as a starting material and treated with 0.01-5 N NaOH aqueous solution at 97-98℃ in the water bath for 2 hrs. At the concentration of NaOH below 0.5 N, all chemical compositions in the tuff were virtually insoluble and the mordenite structure did not change. At the concentration above 1 N, the chemical compositions such as silica, alumina, etc., were dissolved. The dissolution ratio of silica was larger than that of alumina, and the ratio of silica to alumina in the tuff decreased sharply in the concentration range of 2-3 N. Intensity of X-ray diffraction peak of mordenite (202) and the amount of CO_2 adsorbed also decreased with the increasing concentration of NaOH above 1 N. These decreases corresponded to the degree of mordenite structure collapsed. By alkali treatment, only H^+ was exchanged by Na^+, and K^+ and Ca^<++> in mordenite were not exchanged, hence Na-rich mordenite was obtained. Gaschromatographic separation of O_2, N_2 and CO was not affected by the alkali treatment, but elution peaks of CH_4 and Kr tended to be broadened and their retention time was shortened. The elution peaks of both CH_4 and Kr tended to be overlapped with those of N_2 and O_2.
日本粘土学会の論文
1979-05-25

化学処理によるモルデンフッ石系凝灰岩の物理化学的特性の変化(第1報) : 水酸化ナトリウム溶液処理による影響

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