NIE Yujuan, WANG Erdong, WANG Xuyun. New approach to prepare high purity and superfine alumina powder[J]. CIESC Journal, 2017, (9): 3616-3622.DOI: 10.11949/j.issn.0438-1157.20170176.
99.99% high-purity aluminum is introduced as anode material to obtain aluminum hydroxide
the precursor of alumina
by an electrochemical method. The influence of calcination temperature and holding time on preparing high purity and superfine alumina is discussed. And effects on morphology and size of alumina at different current densities are studied. Experimental results show that the average size of 268 nm aluminum hydroxide can be obtained at 70 mA·cm-2
a relative high current density in aluminum/air batteries. After washing aluminum hydroxide and roasting at 1400℃
holding 3 h
the average size of 200 nm and near-spherical alumina powder is received. However
alumina particles agglomerate seriously at low current densities
which is mainly caused by narrowing of metastable zone width at high current densities.