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Thermal decomposition of calcium sulphate in carbon monoxide

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Abstract

Simultaneous TG and DTA studies were performed on analytical grade calcium sulfate and on samples of natural gypsum and phosphogypsum in carbon monoxide atmosphere. The decomposition temperatures and mechanism are influenced by the mineral impurities of the sample and the heating rate as well as the CO content of the gas atmosphere.

Zusammenfassung

Simultane TG- und DTA-Untersuchungen von analytisch reinem Calciumsulfat und Proben von natürlichem Gips und Phosphogips wurden in Kohlenmonoxidatmosphäre ausgeführt. Temperatur und Mechanismus der Zersetzung werden durch mineralische Verunreinigungen der Probe, durch die Aufheizgeschwindigkeit und durch den CO-Gehalt der Gasatmosphäre beeinflußt.

Резюме

Совмещенный метод ТГ и ДТА был использован для изучения в атмосфере окиси углерода анали тически чистого суль фата кальция и образцов природног о гипса и фосфогипса. Температ уры разложения и меха низм реакций зависят от ми неральных при-месей в образцах, скорости н агрева, а также от соде ржания окиси углерода в газо вой атмосфере.

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Author notes

  1. R. Kuusik

    Present address: Tallion Polytechnic Institute, Tallinn, Estonian SSR, USSR

Authors and Affiliations

  1. Department of Chemistry, Helsinki University of Technology, SF-02150 ESPOO 15, Otaniemi, Finland

    R. Kuusik, P. Salkkonen & L. Niinistö

Authors
  1. R. Kuusik
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  2. P. Salkkonen
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  3. L. Niinistö
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Additional information

The authors are indebted to Professor M. Veiderma for fruitful discussions and continuous support. The scholarship from Finnish Government to one of us (R. K.) is gratefully acknowledged.

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Kuusik, R., Salkkonen, P. & Niinistö, L. Thermal decomposition of calcium sulphate in carbon monoxide. Journal of Thermal Analysis 30, 187–193 (1985). https://doi.org/10.1007/BF02128129

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  • DOI: https://doi.org/10.1007/BF02128129

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