2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 3: Oye Intl. Symp. / Ionic Liquid and Aluminum
| Editors: | Kongoli F, Feng N, Polyakov P, Gaune-Escard M |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 180 pages |
| ISBN: | 978-1-987820-40-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Preparation of ultrafine ¦A-Al2O3 powder from fly ash by ammonium sulfate roasting technology
yan Wu1;1, Shenyang, China;
Type of Paper: Regular
Id Paper: 100
Topic: 37
Abstract:
(NH4)2SO4 roasting technology was used for extract alumina from fly ash which is located in Shandong Zibo power plant. The roasting temperature, the molar ratio of (NH4)2SO4/Al2O3 and roasting time on the effect of the extract rate of alumina was studied. The optimal roasting technology condition is 380¡aC for 120min with a molar ratio of (NH4)2SO4/Al2O3 to 6:1. Under the optimal roasting condition, the alumina extraction rate can reach 83% and a new phase NH4Al(SO4)2 was formed in the clinker. NH4Al(SO4)2 in clinker was leached by distilled water and separated from clinker by filtration. Fe in leached liquid was removed by NH4Fe3(SO4)2(OH)6 formation. Results showed that Fe precipitation of 95% and Al precipitation less than 5% could be achieved with pH value keeping from 1.5 to 2.0 for 2h at 95¡æ and a final pH value keeping at 3.0. NH4Al(OH)2CO3 was prepared by adding (NH)4HCO3 in leached liquid. Ultrafine ¦A-Al2O3 powder was prepared by calcining NH4Al(OH)2CO3 in 1100¡æ for 120min, which was characterized by XRD and SEM.
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