Thermal decomposition of the magnesium sulphate hydrates under quasi-isothermal and quasi-isobaric conditions |
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| Authors: | H -H Emons G Ziegenbalg R Naumann F Paulik |
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| Institution: | (1) Bergakademie Freiberg Fachbereich Chemie, Leipziger Strasse, 9200 Freiberg, Deutschland;(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 |
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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 and — 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 sowie-MgSO4 beobachtet. Die erhaltene Monohydratphase ist strukturell mit Kieserit identisch. Der thermische Abbau der Magnesiumsulfathydrate wird wesentlich vom Wasserdampfpartialdruck beeinflu\t.
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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