Abstract
Semibatch reactive crystallization of basic magnesium carbonate (BMC) and magnesium carbonate trihydrate (MCT) was conducted to clarify the mechanism of reactive crystallization of BMC and MCT produced by precipitation from magnesium hydroxide with carbon dioxide gas. The production regions of BMC and MCT were partitioned by the reaction temperature and the initial concentration of magnesium hydroxide. The reactive crystallization processes of BMC and MCT were confirmed by the experimental results of SEM photographs and X-ray diffraction analysis.