Reactions of salts with kaolinite at elevated temperatures - Part 2

L. Heller-Kallai, M. Frenkel

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Abstract

Abstract Reactions of kaolinite and metakaolinite with salts of alkali metals were studied in the temperature range of 570-950°C, in air and in a nitrogen atmosphere, using thermal and chemical analyses and infra-red spectroscopy, supplemented by other methods. The mixtures react according to the equation 2SiO2.Al2O3-xH2O + 2yMA → 2SiO2.Al2O3.yM2O + (x-y)H2O + 2yHA The water required may be derived from clay hydroxyls or from the atmosphere. The rate is faster when the clay has not been entirely dehydroxylated, but even trace amounts of water in the surrounding atmosphere sustain the reaction. With Li, Na or K salts products resembling eucryptite, nepheline or kalsilite, respectively, tend to be formed. Molten K2CO3 reacts with dehydroxylated kaolinite even in the absence of detectable amounts of water. Prolonged heating with KF leads to anion exchange.

Original languageEnglish
Pages (from-to)629-637
Number of pages9
JournalDevelopments in Sedimentology
Volume27
Issue numberC
DOIs
StatePublished - 1 Jan 1979

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