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Mass Transfer and Kinetics Study of Heterogeneous Semi‐Batch Precipitation of Magnesium Carbonate
Author(s) -
Han Bing,
Qu Haiyan,
Niemi Harri,
Sha Zuoliang,
LouhiKultanen Marjatta
Publication year - 2014
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201300855
Subject(s) - dissolution , precipitation , mass transfer , carbonation , magnesium , chemistry , kinetics , raman spectroscopy , crystallization , hydroxide , carbonate , analytical chemistry (journal) , inorganic chemistry , chemical engineering , chromatography , organic chemistry , physics , quantum mechanics , meteorology , optics , engineering
Precipitation kinetics and mass transfer of magnesium carbonate (MgCO 3 ) hydrates from a reaction of magnesium hydroxide (Mg(OH) 2 ) and CO 2 were analyzed. The effect of CO 2 flow rate and mixing intensity on precipitation was investigated under ambient temperature and atmospheric pressure. Raman spectroscopy was used to determine the composition of the solids during semi‐batch crystallization. The obtained spectra revealed the dissolution of Mg(OH) 2 and the formation of MgCO 3 . The precipitation rate increased with higher gas flow rate. The rotation speed of the stirrer had a significant effect on the dissolution of Mg(OH) 2 . In the researched system, the main driver of the precipitation kinetics was the mass transfer of CO 2 . Nesquehonite (MgCO 3 ·3H 2 O), as needle‐like crystals, was precipitated as the main product. Raman spectroscopy can serve as a potential tool to monitor the carbonation precipitation process.