Abstract
The composition of basic magnesium carbonate varies, mainly due to the decomposition conditions of magnesium bicarbonate. In the present study, we researched the specific composition of samples prepared at different decomposition temperatures of magnesium bicarbonate. Combining XRD, TG-DSC and wet chemical analysis, we found that single component which the formula is MgCO33H2O can be got at room temperature (30 °C). Content of MgCO33H2O in the decomposition products decreases with the increase of decomposition temperature. The decomposition products obtained at 90 °C is 4MgCO3Mg (OH)24H2O based and contain a little MgO, Mg (OH)2, trace amount MgCO33H2O and 4MgCO3Mg (OH)25H2O. Further study show that content of MgCO33H2O influences the density of final product of magnesium oxide. Density of magnesium oxide got by calcining MgCO33H2O is 0.944 g.ml-1, and density of magnesium oxide got by calcining product that was prepared at 90°C is 0.078 g.ml-1.
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