利用高岭土制备纳米氧化铝  

Preparing of Nanometer Alumina Powder from Kaolin

作　　者：周竹发[1] 吴铭敏[1] 冯杰 

机构地区：[1]苏州大学材料工程学院,江苏苏州215021 [2]中国高岭土公司,江苏苏州215151

出　　处：《材料科学与工程学报》2008年第3期335-338,共4页Journal of Materials Science and Engineering

摘　　要：采用高岭土为原料制备纳米氧化铝成本低廉,可以大幅度提高高岭土的产品附加值,提高经济效益。实验以苏州高岭土为原料,通过酸溶、过滤、干燥和煅烧等步骤制备纳米氧化铝粉体。研究了高岭土煅烧温度、分散剂、沉淀剂及干凝胶煅烧温度等因素对氧化铝的浸取率及纳米氧化铝细度、形貌、晶型的影响。实验得出高岭土经700℃煅烧,盐酸浓度20%,Al/HCl摩尔比为1∶7,100℃酸浸3h,浸取率达到93.83%,干燥产物在800℃煅烧得到长度为50nm、长径比为10左右的针状γ-Al2O3,1300℃完全转变为α-Al2O3。Using Kaolin as a raw material to prepare nanometer alumina powder can reduce the cost, improve the kaolin＇s attaohment value and economic efficiency in a large scale. Nanometer alumina powder can be acquired after hydrochloric acid digesting of kaolin, filtering, drying and thermal treatment processing. Some preparing factors were discussed, such as kaolin calcining temperature, dispersant agent, precipitating agent, dry-gelatin calcining temperature etc. These factors make great effects on the leaching rate of alumina and the particle size, pattern, crystal style of the nanometer alumina prepared. The results show that the leaching rate of 93. 83% can be achieved when the kaolin calcined at 700℃ , reacted within HCI of 20% with 1 ： 7 Al/HCl mol ratio at 100℃ for 3h. Acerose nano-sized γ-Al2O3 of about 50nm long with the respect ratio of 10 was prepared by calcining the dry-gelatin at 800℃. The γ-Al2O3 powders were achieved at 1300℃.

关 键 词：高岭土 纳米氧化铝 酸浸 

分 类 号：TQ174[化学工程—陶瓷工业]