有色金属(冶炼部分)

以六水氯化镁和草酸钠为原料,用聚乙二醇作保护剂,通过室温固相化学反应制备了纳米氧化镁的前驱物,真空干燥后,在500℃焙烧前驱物3 h,得到产物纳米氧化镁。采用热分析仪、红外光谱仪、X-射线粉末衍射仪和透射电镜等研究了纳米氧化镁的形成过程和结构;并考察了焙烧温度、焙烧时间和高分子用量对粒径大小的影响。结果表明:高分子保护固相法制备的纳米氧化镁为球形立方晶系结构,纯度高,粒径小,分布范围窄,分散性好,无硬团聚,平均粒径约7.8 nm;高分子保护固相法制备纳米氧化镁的适宜工艺条件为:焙烧温度500℃,焙烧时间3 h,高分子用量3 mL。

The precursor for nanometer MgO was prepared with MgCl2·6H2O and Na2C2O4 as raw materials,the polymer(PEG)as protection reagent for particles by solid-state reaction at room temperature.Nanometer MgO was obtained by calcining the precursor at 500℃ for 3 h after vacuum drying at a constant temperature.The formation process and structure of MgO nanoparticles were investigated by means of TG-DTA,FTIR,XRD and TEM.The effects of calcination time and temperature on the size of MgO nanoparticles were discussed.The results showed that nanometer MgO which was gained by solid-state reaction at polymer protection method had an average diameter of about 7.8 nm with sphere,cubic structure,higher purity,smaller particle size,narrower distribution scope,better dispersivity and no hard reunion,the suitable process conditions of preparing nanometer MgO by solid-state reaction at polymer protection method were determined as following: calcination time 3 h,calcination temperature 500℃,dosage of PEG 3 mL.