Hydration
of medium reactive magnesium oxide using hydration agents |
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| Authors: | E M van der Merwe C A Strydom |
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| Institution: | (1) Department of Chemistry, UNISA, South Africa, 392, 0003;(2) Department of Chemistry, University of Pretoria, Pretoria, South Africa, 0002 |
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| Abstract: | Water, magnesium acetate,
magnesium chloride, acetic acid and hydrochloric acid were used as hydrating
agents for an industrially obtained MgO sample. The influence of these different
hydrating agents on the pH of the hydrating solution, degree of hydration
to Mg(OH)2, and product surface area was studied as
a function of the temperature of hydration. When compared to the hydration
in water, all hydrating agents improved the degree of hydration between 5
and 50% at all temperatures. MgCl2 and a mixture of
HCl and Mg(CH3COO)2 seemed to
be the most effective hydrating agents below 60°C, while at temperatures
above 60°C Mg(CH3COO)2 formed
the largest percentage Mg(OH)2. Mg(CH3COO)2
was the hydrating agent that showed the strongest temperature dependence.
The mechanism of the hydration reaction seems to be dependent of the availability
of Mg2+ ions and the increased formation of Mg(OH)2
as temperature increases. |
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| Keywords: | acetic acid hydration hydrochloric acid magnesium acetate magnesium chloride magnesium oxide pH temperature |
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