Hydrothermal Synthesis and Characterization of One-dimensional Magnesium Hydroxide Chloride Hydrate in CaO-MgCl2-H2O System

doi:10.3724/SP.J.1077.2010.00129

Abstract

Abstract:

One-dimensional magnesium hydroxide chloride hydrate (MHCH) with different structures and morphologies was prepared in CaO-MgCl₂-H₂O system via a hydrothermal method. The effects of MgCl₂ concentration, molar ratio of CaO to MgCl₂ (R), and hydrothermal conditions on the structure and morphology of MHCH were investigated. It was found that MHCH could be prepared when the concentration of MgCl₂ was greater than 3mol/L and R was less than 0.5. Both the diameter and radius length ratio of MHCH increased with the MgCl₂ concentration and R, and the optimum conditions of preparing MHCH were ［MgCl₂］=4mol/L and R=0.05. The phases of MHCH was strongly depended on the reaction temperature, where phase 3 (Mg₂(OH)₃Cl·4H₂O) was stable below 150℃ and phase 9 (Mg₁₀(OH)₁₈Cl₂·5H₂O) was formed above 150℃. In this reaction system at room temperature,Mg₃(OH)₅Cl·3H₂O and phase 5 (Mg₃(OH)₅Cl·4H₂O) appeared firstly, they were both transformed to phase 3 after aged for 1 d. Phase 3 could be converted to phase 9 during hydrothermal treatment at 160℃.

CLC Number:

TB321

CHEN Xue-Gang,Lv Shuang-Shuang,ZHANG Lu,YE Ying,CHENG Ji-Peng,YIN Su-Hang. Hydrothermal Synthesis and Characterization of One-dimensional Magnesium Hydroxide Chloride Hydrate in CaO-MgCl₂-H₂O System[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2010.00129.

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Hydrothermal Synthesis and Characterization of One-dimensional Magnesium Hydroxide Chloride Hydrate in CaO-MgCl₂-H₂O System

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