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• W2184951808 abstract "Sulphate minerals are the main constituent of the evaporite deposits and are used as building material. Evaporite deposits preserve a wealth of information on Earth’s past surface conditions. Such deposits are sensitive indicators of depositional environment and climate, recorded in a wide variety of mechanically and chemically produced sedimentary structures and fabrics. Gypsum is often exploited by plaster industry, for which it represents the raw material to be transformed into hemihydrate (plaster) by dehydration at 393-453 K and atmospheric pressure. The quality and properties of the final material is influenced by the starting material and by the working process. Consequently the study of the chemical-physical features of the phases of the system CaSO4-H2O is necessary. Despite several studies having the CaSO4-H2O system as subject, considerable debate persists on many points, such as the stability and existence of sub-hydrate phases, the mechanism of the dehydration and rehydration processes (Abriel, 1983; Abriel et al., 1990; Chang et al., 1999; Prasad et al., 2001; Follner et al., 2002; Prasad et al., 2005). Consequently much attention have to be used to define the parameters controlling hydrationdehydration processes, thermal behaviour, reaction mechanisms and empirical activation energies. The purpose of this work is to study the thermal stability and the kinetics of phase transition within the CaSO4-H2O system. In particular, the aim is to define the phases and the mechanism of hydration and dehydration of the system CaSO4-H2O. Moreover the thermal stability of γ-anhydrite (γ-CaSO4), β-anhydrite (β-CaSO4), gypsum (CaSO4·2H2O) and bassanite (CaSO4·1/2H2O) have been evaluated. In addition, the kinetics of dehydration of gypsum and bassanite have been studied. Some of the investigated minerals are hygroscopic and unstable in ambient conditions and are microcrystalline. For these reasons, angular dispersive X-ray powder diffraction (ADXD) in ambient and non ambient conditions was used. Experiments were carried out in situ real time by measuring diffraction patterns either in isothermal or in non isothermal conditions. Non ambient data were collected on a parallel-beam Bruker AXS D8 Advance automated diffractometer operating in θ-θ geometry with a PSD Vantec-1 detector set to a 6° 2θ aperture and a prototype of capillary heating chamber (Ballirano & Melis, 2007). Diffraction data were evaluated by the Rietveld method to obtain structural and quantitative information (Young, 1993). Two softwares were used to elaborate the experimental data, GSAS (Von Dreele & Larson, 2001) and TOPAS (Bruker AXS, 2005) that implements the Fundamental Parameters Approach, FPA (Cheary & Coelho, 1992). This study is divided into three main parts. The first one is dedicated to the structural characterization of the phases of the CaSO4-H2O system. The second part is devoted to the thermal stability of the phases of the CaSO4-H2O system. The last part reports the kinetics of the dehydration of gypsum and bassanite." @default.
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• W2184951808 date "2008-01-01" @default.
• W2184951808 modified "2023-09-27" @default.
• W2184951808 title "THERMAL STABILITY AND KINETIC STUDY OF CaSO4-H2O SYSTEM" @default.
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