Effect of Adsorbed Monovalent Cations on the Dehydration Characteristics of Kaolinite at Various Temperatures

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  • カオリナイトの加熱による水分の脱出性に及ぼす吸着一価陽イオンの影響
  • カオリナイト ノ カネツ ニ ヨル スイブン ノ ダッシュツセイ ニ オヨボス キュウチャク 1カ ヨウイオン ノ エイキョウ

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A study on the static dehydration of various ionic kaolinites in vacuum at the temperatures up to 1000°C was carried out, concentrating the attention to the difference of (1) the rate of removal of the water of hydration of adsorbed monovalent rations, and (2) the rate of dehydration of lattice water at constant temperatures.<br>Using Zettlitz and Kampaku (Japanese origin) kaolin, both being high degree of crystallinity, as samples hydrogen kaolinite was prepared by electrodialysis. The single ionic (Li, Na, K, NH4, Cs) kaolinite were obtained by neutralizing the acid clay with the respective bases. The processed samples were dried in vacuum of 10-3 mmHg at 28°C for 12 hours. They were heated successively to 70°, 100°, 150°, 190°, 265°, 300°, 400°, 600° and 1000°C and the water came out by dehydration was determined by volumetric method.<br>The results obtained are summarized as follows:<br>(1) Water of hydration of the adsorbed cations was removed at the temperatures lower than 150-200°C. The maximum rate of dehydration was observed in H+, and the amount of dehydrated water except the case NH4+ was in close correlation with the lyotropic series of the ions.<br>(2) It was confirmed that the lattice water came out at the temperature as low as 300°C.<br>(3) The adsorbed cations seemed to play some role in the dehydration process of lattice water, and the highest rate of dehydration was observed in H-kaolinite.

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