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Alteration of imogolite by dry grinding

Published online by Cambridge University Press:  09 July 2018

Teruo Henmi
Affiliation:
Faculty of Agriculture, Ehime University, Matsuyama 790, Japan
Naganori Yoshinaga
Affiliation:
Faculty of Agriculture, Ehime University, Matsuyama 790, Japan

Abstract

The effects of dry grinding on the structure, morphology and properties of imogolite have been investigated by means of X-ray powder diffraction analysis, IR, DTA, and measurements of CEC and specific surface area. Imogolite is very susceptible to alteration by grinding compared to layer silicate minerals such as halloysite, kaolinite and montmorillonite. In the earlier stages of grinding, the parallel array of imogolite tubular structure units is markedly disturbed. On further grinding, disruption of Si-O-Al linkages, polymerization of the silica component released and loss of structural OH groups proceed simultaneously, these changes eventually resulting in complete breakdown of the structure. Ground imogolite is reaggregated finally into granular particles of irregular shape. All these changes are associated with a decrease in water holding capacity, CEC and specific surface area.

Résumé

Résumé

Les effets du broyage à sec sur la structure, la morphologie et les propriétés de l'imogolite ont été étudiés par diffraction des rayons X, IR, ATD., et la mesure de la CEC. et des surfaces spécifiques. L'imogolite est très sensible à l'altération par broyage, compareée aux minéraux phylliteux tels l'halloysite, la kaolinite et la montmorillonite. Dès le début du broyage l'empilement parallèle des unités structurales tubulaires de l'imogolite est détruit. En continuant le broyage, les liaisons Si-O-Al sont rompues, la silice passée en solution polymérise et la perte des groupes OH structuraux s'amplifie; ces changements peuvent conduire à l'effondrement complet de la structure. L'imogolite broyée est finalement reaggrégée en particules granulées de forme irrégulière. Tous ces changements sont associés avec une diminution de la capacité de rétention de l'eau, de la CEC. et de la surface spécifique.

Kurzreferat

Kurzreferat

Die Einflüsse trockenen Mahlens von Imogolit auf dessen Struktur, Morphologie und Eigenschaften wurden mittels Pulverdiffraktometrie, IR, DTA, sowie Messungen der Kationenaustauschkapazität und der spex. Oberfläche untersucht. Im Vergleich zu Schichtsilikaten wie Halloysit, Kaolinit und Montmorillonit reagiert Imogolit sehr empfindlich auf Veränderungen durch Mahlen. Zu Beginn wird die Parallelanordnung der Imogolitröhren-struktureinheiten deutlich zerstört. Bei weiterem Mahlen zeigte sich eine Sprengung der Si-O-Ai Bindungen, die Polymerisation des Silicatbestandteiles löste sich und ein struktureller OH-Gruppenverlust stellte sich gleichzeitig ein. Alles zusammen verursacht eventuell einen kompletten Strukturzusammenbruch. Gemahlener Imogolit ordnet sich letztlich wieder in unregelmäßig geformte Granulatpartikel an. Begleitet sind alle vorgänge mit einer Abnahme der Wasserhalte und Kationenaustauschkapazität, sowie der spez. Oberfläche.

Resumen

Resumen

Los efectos de la molienda en seco sobre la estructura morfológica y propiedades de la imogolita, han sido estudiadas por DR X, IR, ATD., medidas de capacidad de cambio y de superficie especifica. La imogolita es muy sensible a la alteración por molienda comparada con otros silicatos laminares tales como la haloisita, caolinita y montmorillonita. En las primera etapas de la molienda, el ordenamiento paralelo de las unidades tabulares de la estructura de la imogolita se ve fuertemente alterado. Moliendas posteriores dan lugar a la rotura de los enlaces Si-O-Al, la polimerización de la sílice liberada ya la desaparición de los grupos OH estructurales. En algunos casos estos cambios provocan la completa destrucción de la estructura. La imogolita molida se reagrupa finalmente en partículas granulares de forma irregular. Todos estos cambios van asociados a una disminución de la capacidad de retención de agua, de la capacidad de cambio y de la superficie especifica.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1981

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