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Study of thermal behaviour up to 1550° of materials containing calcium sulphate

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Abstract

Thermal analysis up to 1550 °C on natural and synthetic materials containing CaSO4 revealed the temperature ranges of dehydration, impurity content decomposition and CaSO4 decomposition. CaSO4 decomposition starts above 1200 °C and proceeds in several steps, depending on the CaO content. CaSO4 forms several eutectic compositions with CaO (at 1340, 1390, 1410 and 1450 °C), each decomposition step being preceded by the formation and fusion of a eutectic composition, the decomposition taking place in the melt.

Zusammenfassung

Die thermische Analyse bis 1550 °C von CaSO4 enthaltenden natürlichen und synthetischen Materialien hat gezeigt, daß Temperaturbereiche zu unterscheiden sind, in denen die Dehydratisierung und die Zersetzung von Verunreinigungen und CaSO4 verlaufen. Die Zersetzung von CaSO4 setzt oberhalb 1200 °C ein und verläuft, abhängig vom CaO-Gehalt der Probe, in mehreren Schritten. Es wurde festgestellt, daß Calciumsulfat mit CaO mehrere eutektische Gemische (bei 1340, 1390, 1410 und 1450 °C) bildet. Jedem Zersetzungsschritt geht die Bildung und das Schmelzen eines eutektischen Gemischs voraus. Die Zersetzung selbst geht in der Schmelze vor sich.

Резюме

Проведенный до темпе ратуры 1550 °С, термическ ий анализ, природных и си нтетических материалов, содержащ их сульфат кальция, по зволил определить температ урные интервалы процессов дегидратации, содерж ания примесей и разложени я сульфата кальция. Разложение п оследнего начитаетс я выше 1200 °С и протекает в нескольк о стадий, в зависимости от соде ржания окиси кальция в образце. Установлено, что суль фат кальция и окись кальция образу ют при температурах 1340, 1390, 1410 и 1450°С несколько эвтектиче ских смесей. Каждой стадии разложения предшест вует образование и плавле ние эвтектики, а само разложение про текает в расплаве.

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Authors and Affiliations

  1. Institute of Construction, Bucharest, Romania

    M. Popescu, A. Simion & V. Matei

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  1. M. Popescu
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  2. A. Simion
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  3. V. Matei
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Popescu, M., Simion, A. & Matei, V. Study of thermal behaviour up to 1550° of materials containing calcium sulphate. Journal of Thermal Analysis 30, 297–303 (1985). https://doi.org/10.1007/BF02156495

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  • DOI: https://doi.org/10.1007/BF02156495

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