水热法制备超细氢氧化镁

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

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。

Superfine Mg（OH）2 particles 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） 2 particles 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.