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Journal of Thermal Analysis and Calorimetry

, Volume 133, Issue 3, pp 1549–1562 | Cite as

The influence of water-soluble impurities on thermal dehydration kinetics of phosphogypsum in self-generated atmosphere

  • K. G. Gorbovskiy
  • A. I. Ryashko
  • A. I. Kazakov
  • A. M. Norov
  • A. I. Mikhaylichenko
Article
  • 41 Downloads

Abstract

The paper presents the results of studies of the effect of water-soluble impurities on the thermal dehydration of phosphogypsum in a self-generated atmosphere, which are obtained by thermogravimetry and differential scanning calorimetry. For comparison, the results of the thermal dehydration of gypsum are given. The information about the change in activation energy depending on the extent of the dehydration and the effect of temperature on the mechanism of the dehydration is obtained by the use of integral isoconversional and model-fitting methods. It has been established that water-soluble impurities have a significant influence on the kinetics of the dehydration. It has been shown that in the thermal dehydration of gypsum an abnormal change in the reaction rate and activation energy is observed. In the dehydration of phosphogypsum, this phenomenon is not observed. This is due to the impact of the water-soluble impurities on the recrystallization of an intermediate amorphous phase during the thermal decomposition.

Keywords

Phosphogypsum Gypsum Thermal dehydration kinetics Self-generated atmosphere Thermogravimetry DSC 

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.The Research Institute for Fertilizers and Insecto-Fungicides Named After Professor Y. SamoilovCherepovetsRussia
  2. 2.Institute of Problems of Chemical PhysicsRussian Academy of SciencesChernogolovkaRussia
  3. 3.D. Mendeleev University of Chemical Technology of RussiaMoscowRussia

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