摘要
以MgC l2.6H2O和CO(NH2)2为原料,由均匀沉淀法制备氢氧化镁沉淀,采用溶剂置换直接煅烧法、溶剂置换箱式干燥法、溶剂置换微波干燥法和超临界CO2萃取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,研究不同溶剂置换干燥方式对纳米氧化镁粉体形貌、尺寸和团聚行为的影响;讨论了溶剂置换干燥的基本原理和溶剂置换的方法。
Magnesium hydroxide precipitate was prepared from MgCl2·6H2O and CO（NH2） 2 by homogenous precipitation method. Before it was calcined to produce magnesium oxide nanoparticles,the precipitate was dried to remove its solvent by the following methods： solventdisplacement calcining, solvent-displacement oven drying, solvent-displacement microwave drying and supercritical CO2 extraction-drying. All samples were characterized by X-ray diffraction and transmission electron microscope to investigate the effects of solvent-displacement drying methods on the morphology and particle size of nanoscale magnesia. Principle and methods of solvent-displacement drying were discussed.
出处
《盐业与化工》
CAS
北大核心
2006年第4期13-16,共4页
Jounral of Salt and Chemical Industry
关键词
置换干燥
纳米氧化镁
氢氧化镁
溶剂置换
团聚
displacement drying
nanoscale magnesia
magnesium hydroxide
solvent displacement
agglomeration
