摘要
以MgCl2·6H2O和CO(NH2)2为原料,采用均匀沉淀法制备出氢氧化镁沉淀,分别经直接干燥法、置换干燥法和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、X射线衍射仪和红外光谱仪的表征与分析,研究干燥方法对纳米氧化镁粉体形貌和团聚情况的影响,探讨了干燥过程的防团聚机理。
Abstract： Taking magnesium chloride and urea as raw materials, magnesium hydroxide precipitate was prepared by homogenous precipitation method. Before it was calcined to produce nanoscale magnesium oxide, the precipitate was dried to remove its solvent by the following methods： drying. direct drying, displacement drying and surface modification 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 nanoscale magnesia. Mechanism of agglomeration for drying process was discussed.
关键词
纳米氧化镁
氢氧化镁
置换干燥
改性干燥
团聚
magnesium hydroxide
nanoscale magnesia
displacement drying
surface modification drying
agglomeration
