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This article in SSSAJ

  1. Vol. 45 No. 4, p. 815-818
     
    Received: Feb 13, 1980
    Accepted: Feb 17, 1981


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doi:10.2136/sssaj1981.03615995004500040029x

Halloysite and Kaolinite Cesium Chloride-Urea Intercalation Facilitated by a Trace of Water at Elevated Temperature1

  1. T. Higashi and
  2. M. L. Jackson2

Abstract

Abstract

Addition of 75 µliters of H2O to a mixture of 50 mg of partially hydrated spherical and tubular halloysite or coarse kaolinite and 250 mg of CsCl at 80°C for 48 hours followed by two washings with 10% urea solution produces a complete CsCl-urea intercalation at a 10.4–10.6å x-ray diffraction spacing. Washing with 10% urea solution enhanced the 10.4–10.6å peak by removal of the excess CsCl. Fireclay and fine kaolinites require 1–4 min of grinding in CsCl for complete expansion to 10.4–10.6Å spacing. As a result of 3 min of grinding, an additional 8–23% of SiO2 + Al2O3 is dissolved from such kaolinites during 2.5 min of boiling in 0.5N NaOH.

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