The effect of calcining conditions on the rehydration of dead burnt magnesium oxide using magnesium acetate as a hydrating agent |
| |
| Authors: | C. A. Strydom E. M. van der Merwe M. E. Aphane |
| |
| Affiliation: | (1) Department of Chemistry, University of Pretoria, Pretoria 0002, South Africa;(2) Department of Chemistry, P. O. Box 392, UNISA 0003, South Africa;(3) Department of Chemistry, P. O. Box 392, UNISA 0003, South Africa |
| |
| Abstract: | Summary 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. |
| |
| Keywords: | rehydration magnesium oxide reactivity calcination rehydration agent |
| 本文献已被 SpringerLink 等数据库收录！ |
|
