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Description:    Magnesium hydroxide with high purity and uniform particle size distribution was synthesized by the direct precipitation method using MgCl 2 and NaOH as reactive materials and NaCl as additive to improve the crystallization behavior of the product. The particle size distribution, crystal phase, morphology, and surface area of magnesium hydroxide were characterized by Malvern laser particle size analyzer, X-ray diffraction (XRD), scanning electron microscope (SEM) and Branauer-Emmett-Teller (BET) method, respectively. The purity of products was analyzed by the chemical method. The effects of synthesis conditions on the particle size distribution and water content (filtration cake) of magnesium hydroxide were investigated. The results indicated that feeding mode and rate, and reaction temperature had important effects on water content and the particle size distribution of the product, and sodium chloride improved the crystallization behavior of magnesium hydroxide. The ball-like magnesium hydroxides with the particle size distribution of 6.0–30.0 μm and purity higher than 99.0% were obtained. This simple and mild synthesis method was promising to be scaled up for the industrial production of magnesium hydroxide. Content Type Journal Article Category Research Article Pages 416-421 DOI 10.1007/s11705-011-1125-9 Authors Xingfu Song, State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237 China Shuying Sun, State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237 China Dengke Zhang, State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237 China Jin Wang, State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237 China Jianguo Yu, State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237 China Journal Frontiers of Chemical Science and Engineering Online ISSN 2095-0187 Print ISSN 2095-0179 Journal Volume Volume 5 Journal Issue Volume 5, Number 4