Abstract
The hydrothermal synthesis process for anhydrous magnesium carbonate (MgCO3) from Na2CO3 and three different soluble magnesium sources (MgSO4, MgCl2 and Mg(NO3)2) are investigated. High purity MgCO3 particles are synthesized at the reaction temperature of 160 °C, the reaction time of 6 h, and the reactant ratio of 1:1 in the three groups of experiments. The effect of different anions of the magnesium sources are investigated through comparison of the morphologies and specific surface areas of the obtained MgCO3 particles. MgCO3 particles using Mg(NO3)2 as the magnesium source shows the thinnest layers stacked structure with flawless surface and the least specific surface area. Besides, the PHREEQCI computation results show that the water activity of the reaction solution using Mg(NO3)2 as the magnesium source is the lowest. Based on the above results, the possible synthesis mechanism of MgCO3 with the different magnesium sources are proposed.
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