Preparation of α-Alumina from Coal Fly Ash by Sintering with Sulfuric Acid

Abstract:

A technology was studied to prepare -alumina from fly ash, and the integrated process flow including sintering with sulfuric acid, leaching, recrystallization, calcination was established in this paper. The influences including the particle size of fly ash, sintering temperature, sintering time and the mass ratio of sulfuric acid to fly ash on the extraction ratio of alumina were investigated and discussed during sintering process, and the optimal parameters were determined. The product of -alumina was examined by chemical analysis, XRD and SEM, and the results show that α-alumina reach the national standards.

• Periodical: Advanced Materials Research (Volumes 113-116)
• Pages: 2039-2044
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.113-116.2039
• Online since: June 2010
• Authors: Wen Ning Mu, Yu Chun Zhai
• Keywords: Coal Fly Ash, Sintering, Sulfuric Acid, α-Alumina

References

[1] R.K. Dhir, Emerging trends in fly ash utilization. World Scenario. In: Proceedings of International Congress Fly Ash Utilization Programme (FAUP), TIFAC, DST, New Delhi. 4-7 December, p.1. 1-1. 5 (2005).

[2] X. P Liang., C.D. Su. Comprehensive Utilization of Powdered Coal Ash and Focal Point of Further Development. Journal of Hebei Institute of Technology 27(3), 148-150 (2005).

[3] H.Y. Ding, H.W. Ma, F. Gao. Preparation of Aluminum Hydroxide from High-alumina Fly Ash: An Experimental Study. Bulletin Mineralogy Petrology Geochemistry, 20(3), 405-408 (2006).

[4] H. C. Park. Synthesis of alumina from high purity alum derived from coal fly ash. Materials Science and Engineering A 367, 166-170 (2004).

DOI: 10.1016/j.msea.2003.09.093

[5] R. H Matjie, J. R Bunt, H. Van. Extraction of alumina from coal fly ash generated from a selected low rank bituminous South Afric coal. Minerals Engineering 18(3): 299-310 (2005).

DOI: 10.1016/j.mineng.2004.06.013

[6] G. Burnet, M.J. Murtha, J.W. Dunker. Recovery of metals from coal ash. Ames Laboratory, US DOE Iowa State University Ames, Iowa 50011 (1984).

DOI: 10.30919/es8d1118

[7] E. Jackson. Hydrometalurgical Extraction and Reclamation. Ellis Horwood Ltd., John Wiley and sons, New York, pp.109-137, 145-165, 29-70 (1986).

[8] M.J. Freeman. The manufacture of alumina in South Africa, Mintek Report No. M376 D. 200 Hans Strijdom Drive, Randburg, SA (1993).

[9] X.Y. Zhang, H.W. Ma, J.L. Wang. Study of Preparation of Aluminum Oxide from High-alumina Fly Ash. China Non-metallic Mining Industry Herald 48(4): 27-30 (2005).

[10] H. C Yang, S.L. Zheng. Character of Fly Ash and Actuality of Synthetic Using, Journal of Nonmetal Industry of China 34(4), 38-41 (2003).

[11] Y.Y. Liu. Present status of research on extracting alumina from fly ash. Inorganic Chenmicals Industry 39(10), 16-18 (2006).

[12] Y. Wu, Y.C. Zhai, L. S Li. Preparation of High-purity Al2O3 and Super Fine SiO2 from Fly Ash by the New Acid and Alkali Combination Method. Light Metals 9, 2-27 (2007).

[13] L.S. Li, Y.C. Zhai. Extracting Alumina from Fly Ash by Sulfuric Acid. Light Metals 12, 9-12 (2006).