A Study on the Ion Exchange and th Chemical Stability of Na-fluor-tetrasilicic Mica by <TEX>$H^+$</TEX>ions

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J. Korean Ceram. Soc. > Volume 22(1); 1985 > Article

Journal of the Korean Ceramic Society 1985;22(1): 35.

나트륨형불소 4 규소운모의 $H^+$ 이온교환 및 화학적인 안정성에 관한 연구

송종택

단국대학교 재료공학과

A Study on the Ion Exchange and th Chemical Stability of Na-fluor-tetrasilicic Mica by $H^+$ions

ABSTRACT

Synthetic mica $NaMg_{2.5}(Si_4O_{10})F_2 (Na-TSM)$ was treated with HCl solution and H-type exchange resin to investigate the chemical stability and the ion exchange by measuring the dissolution of chemical components and the exchanged $H^+$ ion. The replacement of $Na^+$ ion occurred in contact with HCl solution and H-type ion exchange resin at the surface of Na-TSM particles reached $Na^+$ ions at maximum value of 70~80%. $Mg^{2+}$ ion of octahedral layer became to dissolve from the pH2 solution and th amount of it dissolved in-creased almost proportional to $H^+$ ion concentration from around 0.02N $H^+$ ion equilibrium concentration. The crystalline structure of Na-TSM was destructed by dissolution of Mg2+ ion in cncentrated hydrochloric acid solution and resulted silica gel precipitation.