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J. Anal. Appl. Pyrolysis

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Publication Date
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Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
Keywords
  • Dehydration
  • Magnesium Chloride Hexahydrate
  • Hydrolysis
  • Anhydrous Magnesium Chloride
  • Science & Technology
  • Physical Sciences
  • Technology
  • Chemistry, Analytical
  • Spectroscopy
  • Chemistry
  • Spectroscopy
  • Anhydrous Magnesium-Chloride
  • Thermal-Decomposition
  • Hexahydrate
  • Kinetics
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Abstract

The dehydration of MgCl2 center dot 6H(2)O in MgCl2 center dot 6H(2)O-NH4Cl-KCl system was investigated. The dehydration process was characterized by X-ray diffraction and chemical analysis. The dehydration effects of MgCl2 center dot 6H(2)O in different systems were compared. The dehydration mechanism of MgCl2 center dot 6H(2)O in MgCl2 center dot 6H(2)O-NH4Cl-KCl system was proposed and discussed. The formation of NH4Cl center dot MgCl2 center dot nH(2)O (6 > n >= 0) below 300 degrees C can effectively suppress hydrolysis. The anhydrous KMgCl3 formed above 400 degrees C is more stable than anhydrous MgCl2 at elevated temperature, which can effectively protect the dehydration product from hydrolyzing at high temperature. The content of MgO in anhydrous MgCl2 was 0.02 wt.% when dehydrating MgCl2 center dot 6H(2)O in MgCl2 center dot 6H(2)O-KCl-NH4Cl system with the molar ratio of MgCl2 center dot 6H(2)O:KCl:NH4Cl was 1:2.87:1. (C) 2014 Elsevier B.V. All rights reserved.

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