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Effect of degradation of montmorillonite by vibration grinding on the dTA curves in the range 20–1500°C

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Abstract

The effect of vibration grinding on the DTA curves of montmorillonite isolated from the most important locality of bentonite in the Slovak Republic (Jelšovy potok, Middle Slovakia) was studied in the temperature range 20–1500°C. Interpretation is offered for 6 endothermic and 3 exothermic peaks. vibration grinding modified the course of dehydration of the mineral, suppresses the “dehydroxylation’ peak at 700°C, enables the crystallization of high-temperature quartz, cristobalite and cordierite at lower temperatures in comparison with unground natural montmorillonite. Vibration griding slows down the crystallization of mullite which—unlike quartz, cristobalite and cordierite—does not belong to high-temperature phases of Cheto-montmorillonite. The order in which these high-temperature phases occur is not influenced by vibration grinding.

Zusammenfassung

Im Temperaturbereich 20–1500°C wurde der Effekt von Vibrationsmahlen auf DTA-Kurven von Montmorillonit untersucht, welches aus den bekanntesten Bentonit-Vorkommen der Slowakischen Republik (Jelšovy potok, Mittelslowakei) isoliert wurde. Für 6 endotherme und 3 exotherme Peaks wurde eine Interpretation vorgeschlagen. Vibrationsmahlen verändert den Weg der Dehydratation des Minerals, unterdrückt im Vergleich zu ungemahlenem natürlichen Montmorillonit den “Dehydroxylierungs”-Peak bei 700°C und ermöglicht die Kristallisation von Hochtemperatur-Quarz, Cristobalit und Kordierit bei niedrigeren Temperaturen. Vibrationsmahlen verlangsamt die Kristallisation von Mullit, welches—im Gegensatz zu Quarz, Cristobalit und Kordierit—nicht zu den Hochtemperatur-Phasen von Cheto-Montmorillonit gehört. Die Reihenfolge, in der diese Hochtemperatur-Phasen vorkommen, wird durch Vibrationsmahlen nicht beeinflußt.

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Authors and Affiliations

  1. Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, Mlynská Dolina, 842 15, Bratislava, Slovak Republic

    V. Š. Fajnor & L'. Kuchta

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  1. V. Š. Fajnor
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  2. L'. Kuchta
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Fajnor, V.Š., Kuchta, L. Effect of degradation of montmorillonite by vibration grinding on the dTA curves in the range 20–1500°C. Journal of Thermal Analysis 45, 481–489 (1995). https://doi.org/10.1007/BF02548780

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  • DOI: https://doi.org/10.1007/BF02548780

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