Synthesis and characterization of MgSO_4·5Mg(OH)_2·2H_2O flake powders  

作　　者：符剑刚 梁威 王晖 何章兴 

机构地区：[1]School of Chemistry and Chemical Engineering, Central South University

出　　处：《Journal of Central South University》2011年第6期1871-1876,共6页中南大学学报（英文版）

基　　金：Project(50704036) supported by the National Natural Science Foundation of China;Project(08JJ3027) supported by the Natural Science Foundation of Hunan Province, China

摘　　要：Magnesium oxysulfate （MgSO4·5Mg（OH）2·2H2O） flake powders with an average diameter of 2 ~tm and a thickness of 0.052 μm were prepared using magnesium sulfate and sodium hydroxide as raw materials by hydrothermal synthesis process. The composition, morphology and structural features of the hydrothermal products were examined with X-ray powder diffraction （XRD）, scanning electron microscopy （SEM） and Fourier transform infrared spectroscopy （FTIR）. The experimental results indicate that in the conditions of n（NaOH）/n（MgSO4） of 1.25, the dosage of w（Na3PO4） crystal additives of 1.0% w（MgSO4）, stirring for 5 h at 180 ℃, the morphology of MgSO4·5Mg（OH）2·2H2O products is flaky and laminar, which is a kind of complex magnesium singlecrystal. The recycling of MgSO4 mother liquor was also investigated to make a full use of the materials and reduce disposal. The results prove that there is no adverse effect on the yield and purity of the products.Magnesium oxysulfate (MgSO4·5Mg(OH)2·2H2O) flake powders with an average diameter of 2 μm and a thickness of 0.052 μm were prepared using magnesium sulfate and sodium hydroxide as raw materials by hydrothermal synthesis process. The composition, morphology and structural features of the hydrothermal products were examined with X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The experimental results indicate that in the conditions of n(NaOH)/n(MgSO4) of 1.25, the dosage of w(Na3PO4) crystal additives of 1.0% w(MgSO4), stirring for 5 h at 180 °C, the morphology of MgSO4·5Mg(OH)2·2H2O products is flaky and laminar, which is a kind of complex magnesium single- crystal. The recycling of MgSO4 mother liquor was also investigated to make a full use of the materials and reduce disposal. The results prove that there is no adverse effect on the yield and purity of the products.

关 键 词：hydrothermal synthesis magnesium oxysulfate flake powders crystal additives 

分 类 号：O614.22[理学—无机化学]