Journal of Thermal Analysis and Calorimetry

, Volume 80, Issue 3, pp 659–662 | Cite as

The effect of calcining conditions on the rehydration of dead burnt magnesium oxide using magnesium acetate as a hydrating agent

  • C. A. Strydom
  • E. M. van der Merwe
  • M. E. Aphane


Magnesium oxide was produced through calcination of magnesite ore. A rehydration percentage of MgO to Mg(OH)2 of higher than 60% is obtained using calcination temperatures of 1000°C and below. At these temperatures medium reactive MgO was formed. The extend to which dead burnt MgO (obtained after calcination at 1200°C and higher) may be rehydrated is dependent on the calcination time, but even after 1 h and using magnesium acetate as a hydrating agent only 40% of the initial product has rehydrated to Mg(OH)2. After 4 and more hours of calcinations at 1200°C, a maximum of approximately 14% of the initial MgO is rehydrated back to Mg(OH)2. Thermogravimetric analysis was performed on the various compounds to determine the amounts of Mg(OH)2 that formed.

rehydration magnesium oxide reactivity calcination rehydration agent 


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Copyright information

© Springer-Verlag/Akadémiai Kiadó 2005

Authors and Affiliations

  • C. A. Strydom
    • 1
  • E. M. van der Merwe
    • 2
  • M. E. Aphane
    • 3
  1. 1.Department of Chemistry, University of Pretoria
  2. 2.Department of Chemistry
  3. 3.Department of Chemistry

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