The nature of clay volatiles and condensates and the effect on their environment: A review

L. Heller-Kallai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

When clays are heated, a mass loss occurs due to the evolution of volatiles. Most of these are water vapour, but in addition minor amounts of a complex assemblage of other species are liberated. The corresponding condensates are colloidal suspensions. The composition of the volatiles and condensates and the release patterns of the gases are reviewed. The nature of the assemblages varies from one clay to another and depends on the thermal regime. Both volatiles and condensates are very reactive. Their reactivity persists even after prolonged storage. They act as acid catalysts in reactions with organic matter and decompose calcite and other carbonates. Condensates were found to etch the surfaces of quartz crystals and to dealuminate and partly destroy an Al-rich faujasite (zeolite). Possible implications of reactions of clay volatiles and condensates for natural processes are discussed.

Original languageEnglish
Pages (from-to)154-156
Number of pages3
JournalJournal of Thermal Analysis
Volume50
Issue number1-2
StatePublished - 1997

Keywords

  • Acid catalysis
  • Calcite
  • Clay condensates
  • Clay volatiles
  • Quartz
  • Zeolite

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