Reactions of kaolinites and metakaolinites with NaOH-comparison of different samples (Part 1)

L. Heller-Kallai*, I. Lapides

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

112 Scopus citations

Abstract

Reactions with aqueous sodium hydroxide of eight different kaolinites and of metakaolinites derived from them were studied under hydrothermal conditions. All the kaolinites gave basic hydrosodalite 8:2:2 (8Na+/2OH-/2H2O) as the primary product. The metakaolinites reacted to produce mainly zeolite A, in some of the samples associated with minor amounts of zeolite X. After 5 days, all the metakaolinites were converted to hydrosodalite. The kinetics of the reactions of the samples differed, but no correlation could be established between the rates of the reactions and the crystallinity of the kaolinites, the impurities present or any other observed feature of the starting material.

Original languageEnglish
Pages (from-to)99-107
Number of pages9
JournalApplied Clay Science
Volume35
Issue number1-2
DOIs
StatePublished - Jan 2007

Keywords

  • Hydrosodalite
  • Kaolinite
  • Metakaolinite
  • Precursor gel
  • Zeolite A
  • Zeolite X

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