Abstract
Mixed-layer kaolinite/smectites containing 40–90% kaolinite layers have been synthesized from Wyoming smectite. Run times were 4 months at 156°C in solutions of A1C13∙6H2O and KCl or CaCl2. Similar KCl runs devoid of Al3+ yielded mixed-layer illite/smectites. The supply of Al3+, rather than pK or pH, seems to control the alteration of smectite toward kaolinite or illite.
Резюме
Смешанно-слойные каолиниты/смектиты, содержающие 40–90% каолинитовых слоев, были синтезированы из смектитов Вайоминга. Процесс продолжался 4 месяца при 156°С в растворах А1С13–6Н2O и КС1 или СаС12. Подобные процессы с КС1 но без А13+ приводили к формированию смешано-слойных иллит/смектитов. Поступление А13+, а не рК или рН, по-видимому, контролирует превращение смектита в каолинит или иллит. [К.К.]
Resümee
Aus dem Smektit von Wyoming wurden Kaolinit/Smektit-Wechsellagerungen mit 40–90% Kaolinitlagen synthetisiert. Die Versuchszeiten betrugen 4 Monate bei 156°C mit Lösungen aus A1C13-6H20 mit KCl oder CaCU. Ähnliche KCl-Versuche ohne Al3+ lieferten Illit/Smektit-Wecbsellagerungen. Das Angebot an Al3+ scheint die Umwandlung von Smektit in Kaolinit oder Illit in stärkerem Maß zu kontrollieren als pK oder pH. [U.W.]
Résumé
Des smectites/kaolinite à couches mélangées contenant de 40-90% de couches de kaolinite ont été synthétisées à partir de smectite du Wyoming. Les périodes étaient de 4 mois à 156°C dans des solutions d’ACl3∙6H2O et de KCl ou CaCl2. Des séries de KCl semblables sans Al3+ ont fourni des smectites/illite à couches melangées. La provision d’Al3+, plutôt que le pK ou le pH semble contrôler l’altération de la smectite vers une kaolinite ou une illite. [D.J.]
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Środoń, J. Synthesis of Mixed-Layer Kaolinite/Smectite. Clays Clay Miner. 28, 419–424 (1980). https://doi.org/10.1346/CCMN.1980.0280603
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DOI: https://doi.org/10.1346/CCMN.1980.0280603