The Thermal Decomposition of Polyhalite K 2 SO 4  · MgSO 4  · 2 CaSO 4  · 2 H 2 O | Zendy

Fischer S. | Zendy; Voigt W. | Zendy; Köhnke K. | Zendy

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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.

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