Na 型フッ素四ケイ素雲母の酸処理による比表面積の変化

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Synthetic mica, NaMg_<2.5>(Si_4O_<10>) F_2(Na-TSM) , was treated with HCl solution and the correlations between the dissolutions of chemical components and the changes of specific surface area caused by the collapse of crystal structure were investigated. 3.00 g of Na-TSM was dispersed in 300 ml of 0.1 N HCl at 60℃. The replacement of Na^+ ion in the interlayer space and of Mg^<2+> ion dissolved from octahedral layer by H^+ ion took place fast. The dissolution of Mg^<2+> ion facilitated the dissolution of F^- ion accompanied with Si^<4+> ion coordinated in tetrahedral layer and then resulted in making mica particles fine. Meanwhile, MgF_2 would first presipitate from the liquid phase and then the decrease of F^- ion concentration in the liquid resulted in the precipitation of silica gel. The maximum values of specific surface area of 1 hour treated Na-TSM obtained by N_2 adsorption method and ethyleneglycol monoethyl ether adsorption method were 210 m^2/g and 1100 m^2/g respectively. Na-TSM decomposed completely to MgF_2 and silica gel within 24 hours. The measurement of pore size distribution of 1 hour treated Na-TSM showed the existence of many micro pores with radii less than 40Å. Na-montmorillonite was also similarly treated with HCl solution. The rate of ion dissolution from Na-montmorillonite was found to be slower than that from Na-TSM. The maximum values of specific surface area obtained by N_2 adsorption method and ethyleneglycol monoethyl ether adsorption method were 50 m^2/g for 4 hours treated Na-montmorillonite and 880 m^2/g for 1 hour treated Na-montmorillonite respectively.
1980-03-25

Na 型フッ素四ケイ素雲母の酸処理による比表面積の変化

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