Open AccessPreparation of ultrafine α-Al2O3 powder from fly ash by ammonium sulfate roasting technology
Author(s) -
Yan Wu,
Haixia Xin,
Yan Xu,
Jianan Liu
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1347/1/012111
Subject(s) - roasting , calcination , extraction (chemistry) , nuclear chemistry , distilled water , sulfate , chemistry , fly ash , ammonium , materials science , metallurgy , catalysis , chromatography , organic chemistry
(NH 4 ) 2 SO 4 roasting technology was used for extracting alumina from fly ash which located in Shandong Zibo power plant. The roasting temperature, the mole ratio of Al 2 O 3 to (NH 4 ) 2 SO 4 and roasting time on the effect of the extraction rate of alumina was studied. The optimal roasting technology condition is 380°C for 120min with mole ratio of Al 2 O 3 to (NH 4 ) 2 SO 4 of 1:6. Under the optimal roasting condition, the extraction rate of Al 2 O 3 can reached 82% and a new phase NH 4 Al(SO 4 ) 2 was formed in clinker. NH 4 Al(SO 4 ) 2 in clinker was dissolved by distilled water and then separated from silicon-rich residue by filtration. Iron in NH 4 Al(SO 4 ) 2 solution was removed by goethite process, and then, NH 4 Al(OH) 2 CO 3 was synthesized by adding (NH 4 ) 2 CO 3 in NH 4 Al(SO 4 ) 2 solution. Ultrafine α-Al 2 O 3 powder was prepared by calcining NH 4 Al(OH) 2 CO 3 in 1200°C for 120min, which was characterized by XRD and SEM.