Composition and Morphology of Magnesium Carbonate Hydrates Synthesized by the Reaction of MgSO4 with Na2CO3 in 283~363 K
SHAO Ping-ping LI Zhi-bao MI Jian-guo
School of Chemical Engineering of Beijing University of Chemical Technology Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences School of Chemical Engineering of Beijing University of Chemical Technology
Abstract： Precipitation of various forms of magnesium carbonate hydrates was investigated by the reaction of MgSO4 with Na2CO3 at the temperatures from 283 to 363 K. XRD and SEM analysis showed that the reaction temperature had great effect on the morphology of precipitate. Three morphologies, needle-like, spherical-like and sheet-like, were obtained. The needle-like nesquehonite (MgCO3×3H2O) was synthesized from 283 to 313 K. When the temperature was below 303 K, the crystals obtained exhibited a smooth surface, with the increase of reaction temperature to 313 K, the needle-like particles displayed coarse surface covered by little rod-like crystals. When the temperature was up to 323~363 K, the spherical-like crystals were obtained, and with the temperature increasing, the diameter of crystals increased. The initial concentration of MgSO4 and Na2CO3 titration speed had also significant effect on crystal morphology of nesquehonite.
邵平平 李志宝 密建国. 碳酸镁水合物在283~363 K范围内的晶体组成及晶型[J]. , 2009, 9(3): 520-525.
SHAO Ping-ping LI Zhi-bao MI Jian-guo. Composition and Morphology of Magnesium Carbonate Hydrates Synthesized by the Reaction of MgSO4 with Na2CO3 in 283~363 K. , 2009, 9(3): 520-525.
2009, Vol. 9 
