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Thermal decomposition of the magnesium sulphate hydrates under quasi-isothermal and quasi-isobaric conditions

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Abstract

In the course of thermal decomposition of the magnesium sulphate hydrates MgSO4.nH2O (n=7; 6; 5; 4; 3; 2; 5/4; 1) the intermediate steps MgSO4.3H2O, MgSO4.2H2O, MgSO4.H2O andΒ — MgSO4 are observed under quasi-isothermal and quasi-isobaric conditions atp ≅ 0.1 MPa dependent on the water contents. The structure of the obtained monohydrate phase is identical with that of kieserite. Thermal decomposition of the magnesium sulphate hydrates is essentially influenced by the water vapour partial pressure.

Zusammenfassung

Beim thermischen Abbau der Magnesiumsulfathydrate MgSO4.nH2O (n=7; 6; 5; 4; 3; 2; 5/4; 1) unter quasiisothermen- und quasiisobaren Bedingungen werden bei p−0.1 MPa, in AbhÄngigkeit von den Wassergehalten, die Zwischenstufen MgSO4.3H2O; MgSO4.2H2O; MgSO4.H2O sowieΒ-MgSO4 beobachtet. Die erhaltene Monohydratphase ist strukturell mit Kieserit identisch. Der thermische Abbau der Magnesiumsulfathydrate wird wesentlich vom Wasserdampfpartialdruck beeinflu\t.

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Authors and Affiliations

  1. Bergakademie Freiberg Fachbereich Chemie, Leipziger Strasse, 9200, Freiberg, Deutschland

    H. -H. Emons, G. Ziegenbalg & R. Naumann

  2. Institute for General and Analytical Chemistry, Technical University and Research Group for Technical Chemical Analysis of The Hungarian Academy of Sciences, 1521, Budapest, Hungary

    F. Paulik

Authors
  1. H. -H. Emons
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  2. G. Ziegenbalg
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  3. R. Naumann
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  4. F. Paulik
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Additional information

We gratefully acknowledge the assistance of Dr. K. Köhnke in providing X-ray diffraction investigations and the scanning electron micrographs provided by Dr. Ulrich, Bergakademie Freiberg.

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Emons, H.H., Ziegenbalg, G., Naumann, R. et al. Thermal decomposition of the magnesium sulphate hydrates under quasi-isothermal and quasi-isobaric conditions. Journal of Thermal Analysis 36, 1265–1279 (1990). https://doi.org/10.1007/BF01914050

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