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Prototropy in Kaolinite during Percussive Grinding

Published online by Cambridge University Press:  01 July 2024

John G. Miller  and
T. Dixon Oulton
John G. Miller
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia 4, Pa. 19104, U.S.A.
T. Dixon Oulton
Affiliation:
Engelhard Minerals & Chemicals Corp., Menlo Park, Edison, New Jersey 08817, U.S.A.
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Abstract

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When kaolinite undergoes percussive grinding, pronounced changes take place in its i.r. absorption spectrum even in the earliest stages of the grinding when the lattice is not yet destroyed. In this report, attention is directed to the change in the stretching bands of the hydroxyl ions. A remarkably rapid effect on the band of the intralayer hydroxyl ions has been observed and is attributed to a permanent removal of the protons from these ions. Auxiliary measurements of X-ray diffraction, thermal water loss, and DTA were used to corroborate the spectroscopic evidence for this ready prototropy.

Résumé

Résumé

Quand la kaolinite subit un broyage par percussion, des changements prononcés se produisent dans son spectre d’absorption de l’infra-rouge, même dès les premiers stades du broyage, quand l’édifice cristallin n’est pas encore détruit. Dans cet exposé l’attention est orientée au changement des ions hydroxyles dans les bandes d’allongement. Un effet extrêmement rapide sur la bande des ions hydroxyles entre les couches intermédiaires a été observé et est attribué à un enlèvement permanent des protons de ces ions. Les mesures auxiliaires de la diffraction des ryons X, de la perte d’eau thermique et des analyses thermiques différentielles ont été utilisées afin de corroborer l’évidence spectroscopique pour cette prototropie.

Kurzreferat

Kurzreferat

Wenn Kaolinit in der Schlagmühle zerkleinert wird, treten deutliche Veründerungen im ultraroten Absorptionsspektrum auf, und zwar in den Frühstadien der Zerkleinerung, ehe noch das Kristallgitter zerstört worden ist. Im gegenwärtigen Bericht wird auf die Veränderung in den sich dehnenden Banden der Hydroxylionen hingewiesen. Es wurde ein bemerkenswert prompter Effekt auf die Bande der Zwischenschicht-Hydroxylionen beobachtet, der einer bleibenden Entfernung der Protonen von diesen lonen zugeschrieben wird. Zur Bekraftigung der spektroskopischen Bejundung dieser schnellen Prototropie wurden Hilfsmessungen der Röntgenbeugung, des thermischen Wasserverlustes und der differentiellen thermischen Analyse (DTA) durchgeführt.

Резюме

Резюме

Если каолинит подвергается ударному размалыванию, то в его инфракрасных спектрах поглощения даже на ранних стадиях, когда решетка еще не разрушена, обнаруживаются заметные изменения. Наблюдалось весьма быстрое изменение полос межслоевых гидроксилов, которое, очевидно, обусловлено непрерывным удалением из них протонов. Для подтверждения этого процесса переноса протонов в структуре каолинита использованы рентгенографическое исследование, определение потери воды при нагревании и диференциально-термический анализ.

Type
Research Article
Information
Clays and Clay Minerals , Volume 18 , Issue 6 , December 1970 , pp. 313 - 323
Copyright
Copyright © 1970 The Clay Minerals Society

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