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The Thermal Decomposition of Polyhalite K 2 SO 4 · MgSO 4 · 2 CaSO 4 · 2 H 2 O
Author(s) -
Fischer S.,
Voigt W.,
Köhnke K.
Publication year - 1996
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170310115
Subject(s) - decomposition , thermal decomposition , chemistry , crystallography , phase (matter) , crystal structure , diffraction , mineralogy , solid solution , x ray crystallography , crystal (programming language) , powder diffraction , analytical chemistry (journal) , inorganic chemistry , physics , optics , organic chemistry , programming language , computer science
The thermal decomposition of polyhalite (K 2 SO 4 · MgSO 4 · 2 CaSO 4 · 2H 2 O) 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 K 2 SO 4 · 1.76 MgSO 4 · 0.24 CaSO 4 and K 2 SO 4 · 0.64 MgSO 4 · 1.36 CaSO 4 is taking place. The mechanism of decomposition runs through K 2 SO 4 · MgSO 4 CaSO 4 . This phase reacts immediately to the solid solutions, mentioned above.