Ca adsorption on dickite, sericite and quartz.

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  • ディッカイト，セリサイトおよび石英に対するＣａの吸着
  • ディッカイト セリサイト オヨビ セキエイ ニ タイスル Ca ノ キュウチャ

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Abstract

The adsorption characteristics of Ca, Na+ and K+ on H-form dickite (a two-layer clay), mainly below pH10, were studied. The results were compared with those for H-form sericite (a non-expanding three-layer clay) and quartz.<BR>The Ca adsorption in the region of weakly acid to neutral pH decreased in the order sericite>dickite>quartz. The Ca adsorption on dickite was more strongly hindered by K+ than by Na+; whereas for quartz, the effect of these monovalent cations was similar. The saturation adsorption of Ca on dickite increased with pH; on sericite it was constant over the pH range below 10. The negative zeta potential of dickite was reversed at high Ca concentration; as for sericite, the charge reversal was not observed.<BR>The above results show that the mechanism of Ca adsorption on dickite involves some specific interaction in addition to the simple electrostatic one with the negative surface charge and to the exchange reaction with H+ which is considered to be the dominant mechanism of the adsorption on sericite.

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  • Shigen-to-Sozai

    Shigen-to-Sozai 106 (2), 93-98, 1990

    The Mining and Materials Processing Institute of Japan

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