Author/Authors :
Nakahira، نويسنده , , Kenji and Hotta، نويسنده , , Tadashi and Naito، نويسنده , , Makio and Shinohara، نويسنده , , Nobuhiro and Cho، نويسنده , , Yong-ick and Katori، نويسنده , , Shigemi and Emoto، نويسنده , , Hideyuki and Yamada، نويسنده , , Tetsuo and Takahashi، نويسنده , , Takashi and Okumiya، نويسنده , , Masataro and Kumagai، نويسنده , , Chie and Uematsu، نويسنده , , Keizo، نويسنده ,
Abstract :
The wet-sieving method was applied to determine the content of coarse particles in commercial alumina powders by four independent research organizations participated in the Round-Robin Testing. The results showed that those powders clearly contain 700 to several thousands ppm of coarse particles with the size >25 μm, whereas they could not be detected with the conventional particle size analyzer because of their low concentration. SEM and polarized light microscope observations revealed that the coarse particles contained several types of aggregates which survived during the production processes of alumina by the Bayer process.
Keywords :
Al2O3 , Sieving , Coarse Particles , testing
