水热处理法制备超细氢氧化镁  

Synthesis of Superfine Mg(OH)_2 Particles by Using Hydrothermal Treatment Method

作　　者：牛永效[1] 王恩德[1] 席晓风[1] 付建飞[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110004

出　　处：《矿物学报》2010年第2期242-247,共6页Acta Mineralogica Sinica

基　　金：辽宁省自然科学基金资助项目(20072029)

摘　　要：以水镁石为原料,与盐酸反应制得氯化镁,然后将氯化镁和氨水碱溶液在室温下反应得到氢氧化镁,再通过水热处理制备出了超细、高纯的氢氧化镁颗粒,通过利用X射线衍射仪（XRD）和扫描电子显微镜（SEM）对所制得氢氧化镁颗粒的晶相、形貌和颗粒尺寸进行了表征。实验结果表明水热处理温度、填充度和搅拌速度对氢氧化镁晶体的晶相和颗粒尺寸有显著的影响,升高温度有助于改善颗粒的晶形和分散性、并减小颗粒的尺寸,较高的填充度有利于六方片状颗粒的生成,当填充度为40%,搅拌速度为400 r/min,水热处理温度为150℃时,制备出了半径约100-250 nm,厚度为10-100 nm,晶形完整,分散性好、大小均一的六方片状超细、高纯的氢氧化镁颗粒。Mg（OH）2 solution was prepared through the reaction of NH3·H2O and MgCl2,which was prepared through the reaction of HCl and brucite at room temperature.Superfine particles of high pure Mg（OH）2 were synthesized by using hydrothermal treatment of Mg（OH）2 solution.The crystal phase,morphology and particles size of prepared Mg（OH）2 particles were determined with X-ray（XRD） and scanning electron microscopy（SEM）.The results indicated that the hydrothermal treatment temperature,stirring speed and degree of filling had interesting effects on the crystal phase and particle size.Higher hydrothermal treatment temperature can produce well crystallized Mg（OH）2 with small crystallite size and dispersion.Higher degree of filling can lead to Mg（OH）2 particles with regular hexagonal platelet morphology.The prepared superfine particles of high pure Mg（OH）2 exhibited regular hexagonal platelet morphology and narrow size distribution with an average radius of 100-250 nm and thickness of 10-100 nm,under the preparing condition that degree of filling was 40%,stirring speed was 400 r/min and hydrothermal treatment temperature was 150℃.

关 键 词：超细氢氧化镁 制备方法 水热处理温度 填充度 形态 

分 类 号：P578.4[天文地球—矿物学] P579[天文地球—地质学]