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Dissolution Kinetics of Phlogopite. II. Open System Using an Ion-Exchange Resin

Published online by Cambridge University Press:  01 July 2024

Charles V. Clemency
Affiliation:
Department of Geological Sciences, State University of New York at Buffalo, 4240 Ridge Lea Road, Amherst, New York 14226
Feng-Chih Lin
Affiliation:
Department of Geological Sciences, State University of New York at Buffalo, 4240 Ridge Lea Road, Amherst, New York 14226
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Abstract

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The rate of dissolution of phlogopite in an open system was measured at low temperature and pressure and at pH 3–5. The maximum dissolution rate was achieved by maintaining extremely low ionic concentrations in the solution using a cation-exchange resin (hydrogen form) as a trap for released cations. The resin also served as a source of hydrogen ions and acted as a buffer. The concentrations of ions adsorbed on the resin and remaining in solution were measured, along with surface area and cation-exchange capacity. The amount of phlogopite dissolved after 1010 hr was 67 times that dissolved using a CO2-buffered, closed-system method. During the first hour of the experiment, dissolution was incongruent, but later became congruent from 1 to 1010 hr. From 1 to 200 hr the reaction had linear kinetics. The dissolution rate for the first 200 hr of the reaction was 2.0 × 10−14 mole KMg3AlSi3O10(OH)2/cm2/sec. Since no evidence of parabolic kinetics was found, there is no reason to postulate the formation of a “protective layer.”

Резюме

Резюме

Скорость растворения флогопита измерялась в открытой системе при низких температуре и давлении, и при рН от 3 до 5. Максимальная скорость растворения достигалась путем поддерживания очень низкой концунтрации ионов в растворе при использовании катионообменной смолы (водородная форма) для подхвата освобождающихся катионов. Смола использовалась также, как источник водородных ионов и действовала как буферный раствор. Измерялись концентрации ионов, которые были адсорбированы смолой и ионов, которые оставались в растворе, а также площадь поверхности и катионообменная емкость. Количество флогопита, растворенного после истечения 1010 часов, было в 67 раз больше, чем количество флогопита, растворенного с помощью буферного раствора СO2 методом замкнутой системы. Во время первого часа эксперимента растворение являлось инконгруэнтным, но потом, от 1 до 1010 часов становилось конгруэнтным. От 1 до 200 часов кинетика реакции была линейная. Скорость растворения во время начальных 200 часов реакции была 2,0 × 10−4 моль KМg3АlSi3О10(ОН)2/cm2/сек. Так как никакой параболической кинетеки не наблюдалось, нет оснований для предположения о формировании “защитного слоя.” [Е.С.]

Resümee

Resümee

Die Lösungsgeschwindigkeit von Phlogopit in einem offenen System wurde bei niedriger Temperatur und niedrigem Druck bei pH-Werten von 3–5 gemessen. Die größte Lösungsgeschwindigkeit erhielt man, wenn die Ionenkonzentrationen in der Lösung extrem niedrig gehalten wurden, indem ein Ionenaustauschharz (Wasserstoff-Form) als Falle für die in Lösung gegangenen Kationen verwendet wurde. Das Austauschharz diente auch als Wasserstoffionenquelle und als Puffer. Es wurden die am Austauschharz adsorbierten Ionenkonzentrationen und die in Lösung verbleibenden Ionenkonzentrationen gemessen sowie die Oberfläche und die Ionenaustauschkapazität. Die nach 1010 Stunden gelöste Phlogopitmenge war 67 × so hoch wie die, die im geschlossenen System mit CO2-Pufferung gelöst wurde. Während der ersten Stunde des Experimentes war die Lösung inkongruent, wurde aber später im Zeitraum von 1–1010 Stunden kongruent. Im Zeitraum von 1–200 Stunden hatte die Reaktion eine lineare Kinetik. Die Lösungsgeschwindigkeit für die ersten 200 Stunden der Reaktion betrug 2,0 × 10−14 Mol KMg3AlSi3O10(OH)2/cm2/ sec. Da kein Hinweis für eine parabolische Kinetik gefunden wurde, gibt es keinen Grund, die Bildung einer Schutzschicht anzunehmen. [U.W.]

Résumé

Résumé

Le taux de dissolution de la phlogopite dans un système ouvert a été mesuré à température et pression basses, et à un pH de 3–5. Le taux de dissolution maximum a été atteint en maintenant des concentrations ioniques extrèmement basses dans le système, utilisant une résine à échange de cations (forme hydrogène) comme piège pour les cations relâchés. La résine a aussi servi de source pour les ions hydrogène et s'est comportée comme tampon. Les concentrations des ions adsorbés sur la résine et de ceux restant en solution ont été mesurées, ainsi que l'aire de surface et la capacité d’échange de cations. La quantité de phlogopite dissoute après 1010 heures était 67 fois plus grande que celle dissoute utilisant une méthode tamponée au CO2, à système fermé. Pendant la première heure de l'expérience, la dissolution était inconforme mais elle est devenue conforme plus tard, de 1 à 1010 heures. D'une à 200 heures, la réaction avait une kinétique linéaire. Le taux de dissolution pour les 200 premières heures de la réaction était 2,0 × 10 −14 mole KMg3AlSi3O10(OH)2/cm2/sec. Puisqu'il n'a été trouvé aucune évidence de kinétique parabolique, il n'y a pas de raison pour postuler la formation d'une “couche protectrice.” [D.J.]

Type
Research Article
Copyright
Copyright © 1981, The Clay Minerals Society

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