中和法制取Al_2O_3微粉时晶种对相变温度的影响  

The Effect of Seeding on the Phrase Transformation Temperature in the Preparation of Alumina by Neutralization Preparation Process

作　　者：李小斌[1] 黄彦强[1] 刘桂华[1] 周秋生[1] 

机构地区：[1]中南大学,湖南长沙410083

出　　处：《湖南有色金属》2005年第5期18-21,共4页Hunan Nonferrous Metals

摘　　要：在中和沉淀法制备超细氧化铝粉末时,存在目前科研人员普遍难以解决的团聚问题。在由氢氧化铝粉末煅烧得到氧化铝的过程中,由于煅烧温度过高,原本超细的粉末发生了严重的团聚,针对此问题,文章通过添加晶种的方法来降低相变温度,使得在相对较低温度条件下即可得到α-Al2O3。取得了较好的试验结果,将相变温度降低了200℃左右,有效地防止了团聚现象的发生。Currently the problem of agglomeration is generally problem to overcome for the researchers in preparation of Alumina ultra-fine powder by neutralization precipitation. Because of the high calcinations temperature, deteriorated the problem of agglomeration of the ultra-fine powder in the process of making Alumina calcined from Aluminum Hydroxide. To deal with this problem, the addition of seed to the process to decrease the phrase-transformation temperature,thus α- Al2O3 is prepared at lower temperature. The experiment indicates that the decrease of phrase-transformation temperature by 200℃ effectively prevent the problem of agglomeration.

关 键 词：氧化铝 晶种 相变温度 

分 类 号：TQ133.1[化学工程—无机化工]