Efficient Extraction of SiO₂ and Al₂O₃ from Coal Gangue by Means of Acidic Leaching

Abstract:

Coal gangue is mainly composed of SiO₂, Al₂O₃ and other components. It is a huge reserve of aluminum and silicon resources. The coal gangue stockpiles in China is more than 5 billion tons at present, of which contain Al₂O₃ more than 1 billion tons, SiO₂ more than 2.5 billion tons. It will make supplement for the lack of bauxite resources in China to some extent by extracting Al₂O₃ with appropriate methods. In the same time, it will meet the strong demand of national economic growth for aluminum and silicon requirement, and to ensure the safety of national mineral resources. Research for extraction of Al₂O₃, SiO₂ by acid leaching way was carried out in this paper. The influence of acid material ratio, leaching temperature, and leaching time on Al₂O₃, SiO₂ extraction was dealt with in detail. Al₂O_3, SiO₂ in accordance with China national products standard were obtained by optimization of the leaching conditions and parameters.

• Periodical: Advanced Materials Research (Volume 878)
• Pages: 149-156
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.878.149
• Online since: January 2014
• Authors: Ling Dong, Yu Li, Jie Yan, Xin Qian Shu
• Keywords: Acid Leaching, Al₂O₃, Coal Gangue, SiO₂

References

[1] P. Si, Activation technology research of extraction aluminum of coal gangue by acid, Ph.D. Dissertation of east China University of Science and Technology. (2011).

[2] H. Li, Sustainable development research of bauxite resources industry in china, Ph.D. Dissertation of China University of Geosciences (Beijing). (2010).

[3] J.X. Liu, Bauxite resources shortage and the countermeasure analysis, J. Powder industry in China. 2 (2013) 4-6.

[4] X.Y. Li, J.G. Fan, Y.F. Lei, Hazards and comprehensive utilization of coal gangue, J. Ecol . Environ. 11 (2009) 19-26.

[5] Z.X. Ma, Z.J. Ma, Y.D. Ma, The study of preparation of alumina and aluminum hydroxide from coal gangue, J. Non-ferrous Smelting. 8 (2006) 17-23.

[6] C.S. Zhang et al, the new technologies of comprehensive utilization of coal gangue, Beijing: chemical industry press, (2008).

[7] A.L. Jiang. Mineral composition characteristics and utilization way of coal gangue, J. Coal. Chin. 26 (2003) 20 - 23.

[8] P. Zhou. The study of coal gangue utilization, China University of Mining and Technology (Beijing), master thesis. (2007).

[9] W.R. Livingston, D.A. Rogers, R.J. Chapman, et al, The use of coal spoils as feed materials for alumina recovery by acid – leaching routs. 1, The suitability and variability of the feed Materials Hydrometallurgy. 10 (1983) 79-96.

DOI: 10.1016/0304-386x(83)90079-8

[10] W.R. Livingston, D.A. Rogers, R.J. Chapman, et al, The use of coal spoils as feed materials for alumina recovery by acid – leaching routs. 2, The effete of the calcinations conditions on the leaching, properties of the colliery spoil, Hydrometallurgy. 10 (1983).

DOI: 10.1016/0304-386x(83)90079-8

[11] W.R. Livingston, D.A. Rogers, R.J. Chapman, et al, The use of coal spoils as feed materials for alumina recovery by acid-leaching routs. 3, The effete of the leaching conditions on the extraction of aluminium and iron from a fluidized bed ash, Hydrometallurgy. 13 (1985).

DOI: 10.1016/0304-386x(85)90017-9

[12] P. Mahi, N.T. Bailey, The use of coal spoils as feed materials for alumina recovery by acid-leaching routs. 4, The extraction of iron from aluminiferous solutions with amines, in particular Alamine 336, Hydrometallurgy. 13 (1985) 293-304.

DOI: 10.1016/0304-386x(85)90018-0

[13] N.T. Bailey, R.J. Chapman. The use of coal spoils as feed materials for alumina recovery by acid-leaching routs. 5, the effect of fluoride additions on the extraction of aluminum with hydrochloric acid. Hydrometallurgy. 18 (1987) 337-350.

DOI: 10.1016/0304-386x(87)90074-0

[14] W.Y. Lv, Extraction and determination of Al2O3 in coal gangue, J. Env. Eng. (1995)23-26.

[15] L.X. Yang, Y.F. Zhang, J. Lin, The research of extracting alumina by acid leaching method from alumina gangue, J. Coal Pro. Utiliza. 5 (2009) 46.

[16] L. Chen, X.Q. Shu, L.X. Zhang, The research of acid leaching extracting Al2O3 from fly ash, J. Coal Pro. Utiliza. 6 (2007).

[17] Z.M. Zhao, W.D. Zhang, Y.S. Li, Aluminum sulfate was produced by compression process with coal gangue, J. Coal Pro. Utiliza. 1 (1999) 23-24.

[18] S.J. Cui, Q.F. Zhang, J.Y. Zhang, The process discussion of extracting coal gangue, J. non-metal ores mine. 33 (2010) 26.

[19] G.X. Li, Z.D. Wang, et al, The leaching experiments of aluminum from Coal gangue, J. Inner Mongolia Petrochem. Industry. 30 (2004) 23.

[20] F.Q. Cheng, L. Cui, H. Zhang, The experimental research of dissolving alumina from coal gangue, J. Environ. Eng. 1 (2007).

[21] H.Z. Li, Y. Jiang, The comprehensive utilization of coal gangue, J. Coal. technol. 18 (1999) 25-26.