水热法制备超细氢氧化镁

以水镁石为原料，通过煅烧，制得氧化镁粉末，然后将氧化镁和尿素碱溶液反应，通过氧化镁水合法制备出了超细氢氧化镁颗粒，同过利用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。试验结果表明，溶液浓度和添加剂对氢氧化镁晶体的晶相和颗粒尺寸有显著的影响，当溶液浓度为2.5 mol/L，添加剂为PEG 6000的情况下，制备出了半径为250 nm，片厚约150 nm，晶形完整，大小均一的六方片形超细氢氧化镁颗粒，但是样品的纯度有待于进一步的提高。

Synthesis of Superfine Mg(OH)2 Particles by Hydrothermal Method

Superfine Mg(OH)₂particles were synthesized by hydration of MgO made from brucite calcination in CO(NH₂)₂ alkali solutions.The crystal phase,morphology and size distribution of the Mg(OH)₂ particles as prepared were characterized with X-ray(XRD) and scanning electron microscopy(SEM).The results indicated that the solution concentration and additive can remarkably affect the crystal phase and particle size.At a solution concentration of 2.5 mol/L and using PEG 6000 as an additive,the resultant superfine Mg(OH)₂particles exhibit a regular hexagonal platelet morphology and a narrow size distribution with an average radius of 250nm and thickness of 150 nm,but the purity of particles remains to be improved.