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·Whereas supersaturated solutions β = 5 caused gypsum growth in the entire temperature range solutions close to equilibrium β = caused various responses of the gypsum surface The most prominent was a sharp transition from fast growth to very fast dissolution at 120 °C suggesting a sudden nucleation of a phase more stable
·The spectral behavior of gypsum dehydration in the visible to near infrared 350 2500 nm wavelength range was investigated by partially dehydrating the four main habits of gypsum alabaster satin spar selenite and massive to form bassanite No consistent relationship was observed between dehydration temperature and grain size or
·On the basis of the analysis of the electron spin resonance spectrum of the SO 3 − radical ion it is established that the transformation of gypsum CaSO4 · 2H2O into bassanite CaSO4 · with partial removal of water molecules occurs through the formation of an anhydrous metastable phase This phenomenon reflecting the processes of recrystallization
·Methods The dehydration process of FGD gypsum was performed with simultaneous TG/DSC analysis NETZSCH STA 409 Luxx Selb/Bavaria Germany at N 2 atmosphere with a gas flow of 20 mL min − isothermal analysis was carried out at different heating rate 2−20 K min −1 Isothermal analysis was conducted in the temperature range of
·The effects of pressure on the dehydration of gypsum materials were investigated up to 633 K and 25 GPa by using Raman spectroscopy and synchrotron X ray diffraction with an externally heated diamond anvil cell At GPa gypsum starts to dehydrate around 428 K by forming bassanite CaSO4 hemihydrate which completely dehydrates to γ
·The plot of the solubility product values against pressure and temperature according to Eqs 2 to 4 for both gypsum and anhydrite is shown in Fig 5
·KEY WORDS High temperature dehydration Gypsum rock Hydration effect Physical and mechan ical properties Expansibility INTRODUCTION With the development of Chinas national economy and the increasing demand for clean en ergy the development of nuclear energy geother mal energy and natural gas will be the important
·Temperature measurements at pre selected board locations indicated three distinct stages of gypsum dehydration; free moisture evaporation transformation of calcium sulfate dihydrate to calcium
·Low temperature dehydration of gypsum single crystals By isothermal measurements over time ranges up to 60 h at temperatures between 76 °C and 140 °C the dehydration of gypsum CaSO4·2H2O
·In this case the specific heat of dry gypsum is used as a base upon which two peaks usually obtained through Gaussian interpolation [6] [15] are superimposed in the temperature region of gypsum dehydration; the integral of each peak corresponds to the endothermic heat required to complete each corresponding dehydration
·The dehydration is an endothermic process and until the dehydration is finished the temperature of the gypsum does not exceed 150 °C However the dehydration mechanism and the phase transitions in the CaSO 4 n H 2 O system were not fully described yet and the literature sources differ
Dehydration Temperature of Gypsum Keiichi MURAKAMI Yosihisa SHIMAMURA Hirobumi TANAKA Author information In an atomsphere the primary dehydration temperature of natual dihydrated gypsum used as a test sample is 133°C while its secondary dehydration temperature being 192°C Under pressure of saturated water vapor the same sample is
·The pure gypsum ordinary foamed gypsum with different densities 800 kg/m 3 650 kg/m 3 foamed gypsum with glass fiber or with expanded vermiculite were tested in the temperature range of 25 °C 800 °C The results show that the low density ordinary foamed gypsum generates less thermal cracks than the high density gypsum at elevated
·Because gypsum contains water in its structure it can accommodate large shear deformation under external load Laboratory experiments show that during gypsum dehydration the escaping water weakens the rock facilitating deformation In our study we employ microindentation tests to examine the micromechanics of gypsum during dehydration
·In this work we have reinvestigated the thermal degradation kinetics of synthetic gypsum CaSO4·2H2O using a novel approach based on peak deconvolution followed by the application of Model Free isoconversional method Gypsum was prepared using wet chemical route and characterized by conventional X ray diffraction in situ high temperature X
·Thermal conductivity of gypsum boards beyond dehydration temperature K Ghazi Wakili M Koebel T Glaettli M Hofer Materials Science Thermal dehydration of gypsum and borogypsum was investigated under nonisothermal conditions in air by using simultaneous thermogravimetric differential thermal analyzer
·As one of the biggest hazardous solid waste in the metallurgical industry arsenic bearing gypsum ABG is a great threat to environmental safety owing to possible leakage and diffusion contamination
·Keywords gypsum dehydration non isothermal kinetic thermal analysis Introduction The thermal behaviour of gypsum was frequently investigated due to its use as construc tion material The thermal decomposition of gypsum depends on the experimental condi tions Among them the heating rate and the atmosphere of the thermal treatment are par
·The temperature and humidity dependent formation of different crystalline phases CaSO 4 ·xH 2 O with 0 ≤ x ≤ 2 was investigated by in situ X ray powder diffraction using a Bruker D8 diffractometer equipped with an Anton Paar CHC cryo−/ humidity chamber By isothermal measurements over time ranges up to 60 h at temperatures between 76 °C and 140 °C the
·The dehydration is complete integral transformation of gypsum into anhydrite in the case of experiments carried out in liquid water No dehydration of gypsum was observed at 40°C temperature at which gypsum is stable in the presence of water vapor for PCO2 from 120 to 135 bar and a duration of 2 weeks
·The dehydration path gypsum bassanite anhydrite III was shown to have strong parallels to a physical drying process which depends on many parameters beyond the burning temperature
