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The Thermal Decomposition of Polyhalite K2SO4 · MgSO4 · 2 CaSO4 · 2 H2O

✍ Scribed by Dr. S. Fischer; Prof. Dr. W. Voigt; Dr. K. Köhnke

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
301 KB
Volume
31
Category
Article
ISSN
0232-1300

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✦ Synopsis

The Thermal Decomposition of Polyhalite K2SO4 -MgS04 -2 CaS04.2 HzO

The thermal decomposition of polyhalite (K2SO4 . MgS04 . 2 CaS04 . 2 H20) was investigated by DSC/TG and X-ray powder diffraction. The decomposition of the polyhalite starts at 285 "C in releasing the crystal water within one step. Simultaneously the decomposition of the polyhalite into anhydrite and two solid solutions of the compositions K2S04 . 1.76 MgS04 '0.24 CaS04 and K2SO4 .0.64 MgS04 . 1.36 CaS04 is taking place. The mechanism of decomposition runs through K2SO4 . MgS04 CaS04. This phase reacts immediately to the solid solutions, mentioned above. Die thermische Zersetzung von Polyhalit (KzSO.1 . MgS04 . 2 CaS04 . 2 H20) wurde mittels DSClTG und Rontgenpulverdiffraktometrie untersucht. Die Zersetzung des Polyhalits beginnt bei 285 "C mit der Abspaltung des Kristallwassers in einem einstufigen ProzeO. Gleichzeitig kommt es zur Zersetzung des Polyhalits in Anhydrit und zwei Mischkristalle der Zusammensetzung K2S04. 1,76 MgS04.0,24 CaS04 und K~S04.0,64 MgS04 . 1,36 CaS04. Der Zersetzungsmechanismus verlhft uber K2S04 . MgS04 . CaS04. Diese Phase zerfallt dann unmittelbar zu den oben angefuhrten Mischkristallen.

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