摘 要: 以六水氯化镁和尿素为原料, 采用均匀沉淀法制备出氢氧 化镁沉淀, 利用不同改性干燥法除去沉淀中的湿分, 再将干燥的氢 氧化镁粉体经马弗炉煅烧得到纳米氧化镁粉体, 通过透射电子显微 镜和 X 射线衍射仪的表征与分析, 研究了改性干燥方式对纳米氧 化镁粉体形貌、颗粒尺寸和团聚情况的影响, 讨论了改性干燥的基 本原理和改性剂的作用。研究结果表明, 改性干燥方式对纳米氧化 镁颗粒形貌和大小的影响不大, 对其颗粒间团聚状态影响很大。 

关键词: 改性干燥; 氢氧化镁; 纳米氧化镁; 团聚

Abstract: Magnesium hydroxide precipitate was prepared by homoge nous precipitation method, using MgCl₂·H₂O and CO(NH₂)₂ as raw ma terials. Before it was calcined to produce magnesium oxide nano-parti cles, the precipitate was dried to remove its solvent by different meth ods of surface modification drying. All samples were characterized by X-ray diffraction and transmission electron microscope to investigate the effects of drying methods on the morphology and particle size of nano-scale magnesia. Principle of surface modification drying and ac tion of modifiers were discussed. The results indicate that magnesium oxide nano-particles obtained by different surface modification drying processes are with almost same particle diameters of 20 nm to 30 nm and a great difference in agglomeration state. 

Keywords: surface modification drying; magnesium hydroxide; nano scale magnesia; agglomeration