Wu Qisheng

（Yancheng Institute of T echnology，Yancheng224002）

Zhang Shaoming

Ma Zhenhua

（ Nanjing University of Chemical T echnology，Nanjing210009）

Abstract

T he dispersing performance of ultrafine α-Al₂O₃ suspensions w ith addition of the polyacrylic acid（ PAA） ，tannic acid and calgon is studied．T he results show that it is strongly influenced by the concentration of dispersing medium，pH value and powder size distribution．The appropriate medium and its using condition are discovered．

Keywords： polyelectrolyte；wet classification；ultafine pow der；α-Al₂O₃

DOI：10.13732/j.issn.1008-5548.1999.03.007