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Electron Spin Resonance Studies of Iron Oxides Associated with the Surface of Kaolins

Published online by Cambridge University Press:  01 July 2024

B. R. Angel  and
W. E. J. Vincent
B. R. Angel
Affiliation:
Department of Mathematical Sciences, Plymouth Polytechnic, Plymouth, Devon, England
W. E. J. Vincent
Affiliation:
Department of Mathematical Sciences, Plymouth Polytechnic, Plymouth, Devon, England
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Abstract

The different types of iron oxide phases associated with the surfaces of two suites of kaolins from Georgia, U.S.A., and from the Southwest Peninsula of England, have been identified using electron spin resonance (ESR) spectroscopy combined with magnetic-filtration, thermal, and chemical treatments. It has been shown that the English kaolins are coated with a lepidocrocitelike phase, which is readily removed by de Endredy's method of deferrification, while the Georgia kaolins are coated with a hematite- or goethitelike phase, which is not removed by this treatment. Throughout the course of this study, the effects of the various physical and chemical treatments on the brightness values of the kaolins were examined.

Резюме

Резюме

Различные типы фаз окиси железа,приуроченные к поверхностям двух свит каолина,развитых в Джорджии,С.Ш.А.,и на Юго-западном полуострове Англии, были определены с помощью спектроскопического метода резонанса электронного спина/РЭС/в сочетании с магнитно-фильтрационной, тепловой и химической обработками. Было показано, что каолины из Англии покрыты фазой подобной ле-пидокрокиту, который легко удаляется методом деферризации де Ендреди,в то время как каолины из Джорджии покрыты фазами подобными гематиту или гетиту, которые не снимаются этой обработкой. В течение этих исследований были изучены эффекты разных физических и химических обработок на интенсивность осветления каолинов.

Kurzreferat

Kurzreferat

Die verschiedenen Arten von Eisenoxydphasen, verbunden mit der Oberfläche zweier verwandter Kaolins, von Georgia, USA und von der Süd-West Halbinsel Englands, wurden durch “electron spin resonance” (ESR),kombiniert mit magnetischer Filtration, thermischer und chemischer Behandlung, identifiziert. Es wurde gezeigt, daß die englischen Kaoline mit einer Lepi-dokrokit-artigen Phase bedeckt sind, die leicht mittels der de Endredy Methode des Eisenentfernens beScitigt werden kann, wohingegen die Georgia Kaoline mit einer Hematit-oder Goethit-artigen Phase überzogen sind, welche nicht durch diese Behandlung entfernt werden kann. Im Verlauf dieser Untersuchung, wurden die Effekte verschiedener physikalischer und chemischer Behandlungen auf die Glanz-Werte der Kaoline untersucht.

Résumé

Résumé

Les différentes espèces de phases d'oxide de fer associées avec les surfaces de 2 suites de kaolins de Géorgie, U.S.A. et de la Péninsule Sud-Ouest de l'Angleterre ont été identifiées utilisant la spectroscopie de spin (E S R) combinée avec des traitements thermiques, chimiques, et de filtration magnétique. Il a été démontré que les kaolins anglais sont recouverts d'une phase ressemblant à la lépidocrocite qui est facilement retirée par la méthode de déferrification de de Endredy, tandis que les kaolins de Géorgie sont recouverts d'une phase ressemblant à l'hématite ou à la goethite qui ne peut pas être retirée par ce traitement. Au cours de cette étude, les effets des traitements physiques et chimiques sur les valeurs de l’éclat des kaolins ont été examinés.

Keywords

GoethiteHematiteIronKaolinLepidocrocite
Type
Research Article
Information
Clays and Clay Minerals , Volume 26 , Issue 4 , August 1978 , pp. 263 - 272
Copyright
Copyright © 1978, The Clay Minerals Society

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