超细氧化镁的直接沉淀法制备及其表征

Synthesis and Characterization of Superfine-MgO Powders by Direct Precipitation Method

通过正交实验法,研究了直接沉淀法合成超细氧化镁的诸因素对粒径和收率的影响,得到了最佳的工艺条件:反应物MgCl2浓度为1.2 mol/L,NH3.H2O浓度为0.2 mol/L,反应温度为45℃,反应配比MgCl2∶NH3.H2O为1∶10,表面活性剂量1.5‰,反应时间为25 min.用X-射线衍射、红外光谱、扫描电镜和粒度分析等对最佳条件下制得的MgO进行了表征.结果表明:该法得到的氧化镁分散性好、收率较高(60%)、平均粒径小(330 nm左右)且粒度分布均匀.

Superfine-sized magnesium oxide powders were synthesized by direct precipitation method. The optimum synthesis conditions were investigated by an orthogonal test as follows：the optimum concentration of reactants is MgC12 1.2 mol/L, NH3·H2 0 0.2 mol/L, their volume ratio of reactants [ V（MgC12 ） ： V（NH3·H2 O） ] is 1 ： 10, temperature of reactants is 45 ℃, surfactants is 1.5%, and time of the reaction is 25 min. The product were characterized by X-ray diffraction （XRD）, infrared （IR） spectroscopy, scanning electron microscope （SEM） ,particle size analysis, and so on. Results showed that the yield of the superfine sized MgO is more than 60 % with good dispersion behavior and narrow particles size of about 330 nm.