Vacuum Distillation-Treated Spent Potlining as an Alternative Fuel for Metallurgical Furnaces
- 9 Downloads
Spent potlining (SPL) is a well-known hazardous waste from primary aluminum production, and recycling it as an alternative fuel for metallurgical furnaces is a promising application. However, because of the presence of volatile fluorides and fluoride compounds, there are significant environmental concerns and practical/engineering issues. An environmentally friendly technique involving pretreatment of SPL first cut at 700°C by vacuum distillation (VDM) is proposed herein. Using this process route, volatile and leachable fluorides (NaF, LiF, and Na3AlF6) in SPL first cut samples were successfully recycled. The distillation process was found to be beneficial for improving the fixed carbon content of the samples, and the combustion characteristics of the VDM residue were superior to those of raw untreated SPL. Such VDM residue could potentially be used in metallurgical furnaces and burners, with promising applications such as partial or full replacement of coal in pulverized coal injection (PCI) systems.
This work was supported by Postdoctoral Research Foundation of China (No. 2018M633421), Science Foundation of Yunnan Provincial Department of Education (Grant No. 2017FH001-120), and Initial Foundation for Advanced Talents of Honghe University (Grant No. XJ16B02).
- 1.D. Yu, V. Mambakkam, A.H. Rivera, D. Li, and K. Chattopadhyay, Alum. Int. Today 27, 17 (2015).Google Scholar
- 4.W.K. O’Connor, P.C. Turner, and G.W. Addison, “Method for processing aluminum spent potliner in a graphite electrode arc furnace” (United States Patent). http://www.freepatentsonline.com.
- 6.P.D. Indurkar, Doctoral thesis, Rourkela, Odisha (2014).Google Scholar
- 9.R.P. Pawlek, TMS Light Met. 2012, 1313 (2012).Google Scholar
- 10.B. Meirelles and H. Santos, TMS Light Met. 2014, 565 (2014).Google Scholar
- 11.I.V. Flores, F. Fraiz, R.A.L. Junior, and M.C. Bagatini, J. Mater. Res. Technol. in press, 2017.Google Scholar
- 13.L. Gao, S. Mostaghel, S. Ray, and K. Chattopadhyay, Metall. Mater. Trans. E 3, 1 (2016).Google Scholar
- 14.D. Yu, V. Mambakkam, D. Li, K. Chattopadhyay, and L. Gao, TMS Light Met. 1, 579 (2017).Google Scholar
- 18.H.A. Øye. Discussion of industrial spent potlining treatment, in: Proceedings of 35th International ICSOBA Conference, Hamburg, Germany (2017).Google Scholar
- 19.China’s State Environmental Protection Administration. GB 5085.1-2007 Identification standards for hazardous wastes—identification for corrosivity. http://www.gb688.cn/bzgk/gb/index. Accessed 25th April 2007.
- 20.United States Environmental Protection Agency. SW-846 Test Method 1311: Toxicity Characteristic Leaching Procedure. https://www.epa.gov/hw-sw846/sw-846-test-method-1311-toxicity-characteristic-leaching-procedure. Accessed July 1992.
- 22.China’s State Environmental Protection Administration. GB/T 1574-2007 Test method for analysis of the coal ash. http://www.gb688.cn/bzgk/gb/index. Accessed 1 Nov 2007.
- 25.A.V. Proshkin, A.M. Pogodaev, P.V. Polyakov, V.V. Pingin, and I.A. Yarosh, Refract. Ind. Ceram. 84, 49 (2008).Google Scholar
- 26.V. Dassylva-Raymond, L.I. Kiss, S. Poncsak, P. Chartrand, J.F. Bilodeau, and S. Guérard, TMS Light Met. 2014, 603 (2014).Google Scholar