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Determination of impurity in sepiolite by thermal analysis

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Abstract

The aim of this work was to demonstrate, by means of thermoanalytical methods (DTA, TG and DTG), that sepiolite from Vallecas (Spain) is mixed with another mineral which is difficult to determine by X-ray diffraction and chemical analysis in routine mineralogical studies.

The low temperature endothermic effect and weight loss shown by this material can be separated into two effects: one from sepiolite and the other from an accompanying mineral-identified as a magnesium smectile. The concentration of this latter mineral in the mixture attained up to 15%.

Zusammenfassung

Mit vorliegender Untersuchung sollte mittels DTA, TG und DTG gezeigt werden, daß Sepiolith aus Vallecas (Spanien) mit einem anderen, in mineralogischen Routineuntersuchungen durch Röntgendiffraktion und chemische Analyse schwer bestimmbaren Mineral vermischt ist.

Der durch diese Substanz bei niedrigerer Temperatur gezeigte endotherme Effekt und Gewichtsverlust kann in zwei Teileffekte untergliedert werden: der eine von Sepiolith herrührend, der andere von dem Begleitmineral, was als Magnesium-Smektit identifiziert wurde. Die Konzentration letzteren Mineralstoffes erreicht im Gemisch bis zu 15%.

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Authors and Affiliations

  1. Instituto de Ciencia de Materiales, Centro Mixto, Universidad de Sevilla-C.S.I.C., Apdo. 1115, 41080, Sevilla, Spain

    J. L. Pérez-Rodríguez

  2. Departamento de Cristallografía, Mineralogía y Química Agrícola, Facultad de Química, Universidad de Sevilla, Apdo. 553, 41071, Sevilla, Spain

    E. Galán

Authors
  1. J. L. Pérez-Rodríguez
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  2. E. Galán
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Dedicated to Professor Lisa Heller-Kallai on the occasion of her 65th birthday

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Pérez-Rodríguez, J.L., Galán, E. Determination of impurity in sepiolite by thermal analysis. Journal of Thermal Analysis 42, 131–141 (1994). https://doi.org/10.1007/BF02546996

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