Comprehensive Recovery of Carbon and Iron from Fly Ash

Abstract:

Fly ash, which is nominally solid wastes generated during the combustion of coal, contains plenty of valuable minerals. Thus, comprehensive recovery of these valuable minerals not only solves environmental pollution problems but also realizes secondary utilization and added values increase of fly ash resources. The Joint process flow of flotation and magnetic separation was adopted in the experiments to recover carbon and iron from fly ash comprehensively, and good technical indexes had been obtained. Flotation separation was conducted on a sort of fly ash whose ignition loss was about 17%. And the ignition loss of concentrates and tailings obtained are above 55% and below 5%, respectively, which can be for further use. Based on the relatively high contents of iron in flotation tailings, magnetic separation for iron enrichment was carried on subsequently. After concentration, the content of Fe₂O₃ in iron concentrate is above 60%.

• Periodical: Advanced Materials Research (Volumes 634-638)
• Pages: 3321-3324
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.634-638.3321
• Online since: January 2013
• Authors: Jia Liu, Qin Zhang, Song Mao, Xian Hai Li, Shen Jun Zhang
• Keywords: Carbon, Fly Ash (FA), Iron, Recovery

References

[1] Bingxin Bian and Zhe Li: Separation and Utilization Technology of Fly Ash (China University of Mining and Technology Press, Xuzhou 2005). (In Chinese).

[2] Qiang Li, Changhe Chen, Yufen Yang, Xinxi Zhang and Qingru Chen: submitted to Journal of Coal Conversion(2002) (In Chinese).

[3] Yun Tang, Fulin Chen and Anrong Liu: submitted to Journal of Mining R&D (2008) (In Chinese).

[4] GB/T 1596-2005: Fly ash used for cement and concrete (2005). (In Chinese).