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Lithium and Potassium Absorption, Dehydroxylation Temperature, and Structural Water Content of Aluminous Smectites

Published online by Cambridge University Press:  01 July 2024

Leonard G. Schultz
Leonard G. Schultz*
Affiliation:
U.S. Geological Survey, Federal Center, Denver, Colo. 80225
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Abstract

X-ray analysis of Li+- and K+-saturated samples, differential thermal analysis (DTA), thermal gravimetric analysis (TGA), and chemical analysis of 83 samples enable a distinction to be made between Wyoming, Tatatilla, Otay, Chambers, and non-ideal types of montmorillonite, and between ideal and non-ideal types of beidellite. The Greene-Kelly Li+-test differentiates between the montmorillonites and beidellites. Re-expansion with ethylene glycol after K+-saturation and heating at 300°C depends upon total net layer charge and not upon location of the charge. Wyoming-type montmorillonites characteristically have low net layer charge and re-expand to 17 Å, whereas most other montmorillonites and beidellites have a higher net layer charge and re-expand to less than 17 Å.

Major differences in dehydroxylation temperatures cannot be related consistently to the amount of Al3+-for-Si1+ substitution, nor to the amount of Mg, Fe, type of interlayer cations, or particle size. The major factor controlling temperature of dehydroxylation seems to be the amount of structural (OH). Of 19 samples analyzed by TGA, montmorillonites and the one ideal beidellite that give dehydroxylation endotherms on their DTA curves between 650° and 760°C all contain nearly the ideal amount of 4(OH) per unit cell, but the non-ideal montmorillonites and beidellites that give dehydroxylation peaks between 550° and 600°C do not. Non-ideal beidellites contain more than the ideal amount of structural (OH) and non-ideal montmorillonites seem to contain less, although the low temperature of dehydroxylation of the latter could also be due to other structural defects. Change in X-ray diffraction intensity of the 001 reflection during dehydroxylation suggests that the extra (OH) of beidellite occurs at the apex of SiO4 or AlO4 tetrahedrons with the H+ of the (OH)− polarized toward vacant cation sites in the octahedral sheet.

Résumé

Résumé

Une analyse radiographique d’échantillons saturés de Li+ et de K+, analyse différentielle thermique (DTA), analyse gravimetrique thermique (TGA), et analyse chemique de 83 échantillons permettent de faire une distinction entre Wyoming. Tatatilla, Otay, Chambers, et les types de montmorillonites non idéaux, et entre les types de beidellites idéaux et non idéaux. Le test Greene-Kelly Li+ différencie les montmorillonites des beidellites. La redilation par éthylène glycol après saturation de K+ et chauffage à 300°C, dépend de la charge de couche totale nette et non pas de l’emplacement de la charge. Les montmorillonites du type Wyoming sont caractérisées par une charge de couche nette relativement basse, elles ont pour propriété de se redilater à 17 A, alors que la plupart des autres montmorillonites et beidellites possèdent une charge de couche nette plus élevée et se redilatent à moins de 17 A.

Les écarts importants de température de déshydroxylation ne peuvent constamment se rapporter à la quantité de Al3+ pour la substitution de Si4+, ni à la quantité des cations de couche intermédiaire du type Mg, Fe ou à la grosseur des particules. Le plus important facteur de contrôle de la température de déshydroxylation semble être la quantité de (OH) structurel. Des 19 échantillons analysés d’après le procédé d’analyse gravimétrique thermique (TGA), les montmorillonites et le beidellite idéal qui donnent des endothermes de déshydroxylation sur les courbes de l’analyse différentielle thermique (DTA) entre 650° et 760°C, contiennent tous à peu près la quantité idéale de 4(OH) par cellule unitaire. Les beidellites non idéaux contiennent plus que la quantité idéale de (OH) structurel et les montmorillonites non idéaux semblent en contenir moins, bien que la basse température de déshydroxylation de ces derniers puisse être causée par d’autres défauts de structure. Le changement d’intensité de la diffraction des rayons X de la réflexion 001 au cours de la déshydroxylation suggère que le supplément de (OH) des beidellites se produit au sommet des tétraèdres de SiO4 ou AlO4 avec le H+ du (OH) polarisé vers les zones libres de cations de la feuille octaèdre.

Kurzreferat

Kurzreferat

Die Röntgenanalyse Li+- und K+-gesättigter Proben, die differentielle Thermoanalyse (DTA), die gravimetrische Thermoanalyse (GTA) und die chemische Analyse von 83 Proben ermöglicht es eine Unterscheidung zu treffen zwischen Wyoming. Tatatilla, Otay, Chambers und nichtidealen Typen von Montmorillonit, sowie zwischen idealen und nichtidealen Typen von Beidellit. Die Greene-Kelly Li+-Prüfung unterscheidet zwischen Montmorilloniten und Beidelliten, Wiedererweiterung durch Äthylenglykol nach K+ Sättigung und Erwärmung auf 300° hängt von der Gesamtschichtladung und nicht vom Ort der Ladung ab. Die Wyoming-Typ Montmorillonite haben charakteristisch niedrige Schichtladungen und erweitern sich erneut auf 17 Å, während die meisten anderen Montmorillonite und Beidellite eine höhere Schichtladung aufweisen und sich auf weniger als 17 Å erweitern.

Grössere Unterschiede in der Dehydroxylierungstemperatur können auf konsequente Weise weder zu dem Ausmass des Al3+ gegen Si4+ Austausches, noch zu der Menge von Mg, Fe, dem Typ der Zwischenlagenkationen oder der Teilchengrösse in eine Beziehung gebracht werden. Der hauptsächlichste, die Temperatur der Dehydroxylierung beeinflussende Faktor scheint die Menge des (OH) im Gefüge zu sein. Von den 19 durch TGA untersuchten Proben von Montmorilloniten und dem einen Beidellit, die auf ihren DTA Kurven Dehydroxylierungsendotherme zwischen 650° und 760°C ergeben, enthalten alle beinahe die ideale Menge von 4 (OH) pro Einheitszelle, die nichtidealen Montmorillonite und Beidellite, die Dehydroxylierungsspitzen zwischen 550° und 600°C ergeben, jedoch nicht. Nichtideale Beidellite enthalten mehr als die ideale Menge von (OH) im Gefüge, wahrend die nichtidealen Montmorillonite weniger zu enthalten scheinen, obwohl die niedrige Dehydroxylierungstemperatur der letzteren auch auf andere Gefügefehler zurückzuführen sein könnte. Die Veränderung in der Röntgenbeugungsintensität der 001 Reflexion während der Dehydroxylierung deutet darauf hin, dass die zusätzlichen (OH) des Beidellits am Scheitel der SiO4 oder AlO4 Tetraeder Vorkommen, wobei die H+ der (OH)− gegen leere Kationenstellen in der oktaedrischen Platte hin polarisiert sind.

Резюме

Резюме

Рентгеновское изучение образцов, насыщенных Ы и Лi+ дифференциальный термический анализ (ДТА), термогравиметрический анализ (ТГА) и данные химических анализов 83 образцов позволяют установитразличие между монтмориллонитами из Вайоминга, Тататилла, Отэй и Чеймберса, монтмориллонитами неидеального типа и бейделлитами идеального и неидеального типов.

Насыщение Li+, предложенное Грин-Келли, позволяет отличать монтмориллониты от бейделлитов. Набухание, которое вызывает этилен-гликоль после насыщения K+ и нагревания до 300°С, зависит от полной величины заряда слоя, но не от его положения: монтмориллониты вайомингского типа отличаются низкой величиной заряда слоя и при набухании их d(001) возрастает до 17 А;у большинства других монтмориллонитов и бейделлитов заряд слоя больше, при набухании их d(001) не достигает 17 А. Основные различия в температурах дегидроксилизаиии не обнаруживают строгой зависимости как от количества Аl3+, замещающего Si4+, так и от количества Мg, Fе, типа межслоевых катионов, величины частиц. Главным фактором, контролирующим температуру дегидроксилизаиии, по-видимому, является количество структурных (ОН). Из 19 изученных с помощью ТГА образцов все монтмориллониты и один идеальный бейделлит, давшие на кривых ДТА эндотермические прогибы дегидроксилизаиии между 650 и 760°С, содержат почти идеальное количество гидроксилов—4 (ОН) на элементарную ячейку. В этом отношении они отличаются от неидеальных монтмориллонитов и бейделлитов, которые дают прогиб дегидроксилизаиии между 550° и 600°С: неидеальные бейделлиты содержат больше, а неидеальные монтмориллониты меьнше структурных (ОН), чем идеальные; причиной низкой температуры дегидроксилизаиии неидеальных монтмориллонитов могут быть их другие структурные дефекты. Изменение интенсивности рефлекса (001) на рентгенограммах во время дегидроксилизаиии служит указанием на возможность того, что дополнительный (ОН) бейделлита находится на вершине тетраэдров ЗЮт или АЮт, причем Н+ в группе (ОН)− ориентирован по направлению к вакантным позициям катионов в октаэдрическом слое.

Type
Research Article
Information
Clays and Clay Minerals , Volume 17 , Issue 3 , August 1969 , pp. 115 - 149
Copyright
Copyright © 1969, The Clay Minerals Society

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Footnotes

*

Publication authorized by the Director, U.S. Geological Survey.

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