The Immobilization of fluorides from spent carbon cathode in a copper smelting slag
Abstract
The fluorides from spent carbon cathodes could be effectively solidified in a molten copper smelting slag (FeO-Fe3O4-SiO2-CaO-Al2O3) in forms of CaF2 and Ca4Si2F2O7. The results of thermodynamic analysis, chemical analysis, and XRD and EPMA analyses showed that the F solidification efficiency increased with the CaO amount and decreased with the addition of Al2O3 and SiO2. In addition, it was noteworthy that the F solidification efficiency decreased with an excessive CaO amount, which could be ascribed to the consumption of SiO2 through forming CaSiO3 and Ca3Si2O7. It restricted the solidification of the fluoride into Ca4Si2F2O7. Under the conditions of melting temperature of 1300°C, residence time of 60 min, and N2 flow rate of 40 ml/min, the optimum CaO and NaF amounts were found to be 20 wt.% and 6 wt.%, respectively, in which the F solidification efficiency in the copper smelting slag of FeO-Fe3O4-SiO2-CaO-Al2O3 obtained 98.35%.
References
[1] L. F. Andrade-vieira, L. C. Davide, L. S. Gedraite, J. M. S. Campos, H. Azevedo, Genotoxicity of SPL (spent pot lining) as measured by Tradescantia bioassays, Ecotoxicology and Environmental Safety, 74 (2011) 2065-2069. https://doi.org/10.1016/j.ecoenv.2011.07.008
[2] T. K. Pong, R. J. Adrien, J. Besida, T. A. O’donnell, D. G. Wood, Spent potling – A hazardous waste made safe, Process Safety and Environmental Protection, 78 (2000)204-208. https://doi.org/10.1205/095758200530646
[3] K. Yang, Z. L. Tao, K. P. Wang, Z. L. Tian, Y. Q. Lai, Upcycling of spent carbon cathode (SCC) into SCC-2600@rGO facilitates ultrastable and fast lithium storage, Journal of Alloys and Compounds, 877 (2021) 160196. https://doi.org/10.1016/j.jallcom.2021.160196
[4] D. F. Lisbona, C. Somerfield, K. M. Steel, Leaching of spent pot-lining with aluminum anodizing wastewaters: Fluoride extraction and thermodynamic modeling of aqueous speciation, Industrial & Engineering Chemistry Research, 51(2012) 8366-8377. https://doi.org/10.1021/ie3006353
[5] D. F. Lisbona, C. Somerfield, K. M. Steel, Leaching of spent pot-lining with aluminium nitrate and nitric acid: Effect of reaction conditions and thermodynamic modelling of solution speciation, Hydrometallurgy, 134-135 (2013) 132-143. https://doi.org/10.1016/j.hydromet.2013.02.011
[6] Y. Y. Wang, Y. J. Luo, H. Xu, H. J. Xiao, Corrosion behavior and electrochemical property of Q235A steel in treated water containing halide ions (F-, Cl-) from nonferrous industry, Journal of Central South University, 27 (2020) 1224−1234. https://doi.org/10.1007/s11771-020-4362-6
[7] K. W. Dong, F. Xie, W. Wang, Y. F. Chang, D. K. Lu, X. W. Gu, C. L. Chen, The detoxification and utilization of cyanide tailings: A critical review, Journal of Cleaner Production, 302 (2021) 126946. https://doi.org/10.1016/j.jclepro.2021.126946
[8] G. Holywell, R. Breault, An overview of useful methods to treat, recover, or recycle spent potlining, Journal of Metals, 65 (2013) 1441-1451. https://doi.org/10.1007/s11837-013-0769-y
[9] M. Y. Luo, X. P. Gu, T. Qu, L. Shi, Y. N. Dai, F. Lv, Y. Tian, Separation of electrolyte and carbon from electrolytic aluminum spent cathode carbon block by vacuum distillation, Nonferrous Metals Engineering, 10 (2020) 47-52 (in Chinese). https://doi.org/10.3969/j.issn.2095-1744.2020.07.008
[10] Y. W. Wang, J. P. Peng, Y. Z. Di, Separation and recycling of spent carbon cathode blocks in the aluminum industry by the vacuum distillation process, Journal of Metals, 70 (2018) 1877-1882. https://doi.org/10.1007/s11837-018-2858-4
[11] K. Yang, Z. J. Zhao, X. Xin, Z. L. Tian, K. Peng, Y. Q. Lai, Graphitic carbon materials extracted from spent carbon cathode of aluminium reduction cell as anodes for lithium ion batteries: Converting the hazardous wastes into value-added materials, Journal of the Taiwan Institute of Chemical Engineers, 104 (2019) 201-209. https://doi.org/10.1016/j.jtice.2019.09.012
[12] W. M. Xie, F. P. Zhou, J. Y. Liu, X. L. Bi, Z. J. Huang, Y. H. Li, D. D. Chen, H. Y. Zou, S. Y. Sun, Synergistic reutilization of red mud and spent pot lining for recovering valuable components and stabilizing harmful element, Journal of Cleaner Production, 243 (2020) 118624. https://doi.org/10.1016/j.jclepro.2019.118624.
[13] X. L. Wang, X. C. Chen, Development status of processing technology for spent potlining in China, Essential Readings in Light Metals, (2016) 1064-1066. https://doi.org/10.1007/978-3-319-48200-2_143
[14] G. Sun, G. Zhang, J. Y. Liu, W. M. Xie, F. Evrendilek, M. Buyukada, (Co-)combustion behaviors and products of spent potlining and textile dyeing sludge, Journal of Cleaner Production, 224 (2019) 384-395. https://doi.org/10.1016/j.jclepro.2019.03.208
[15] M. Z. Xie, R. B. Li, H. L. Zhao, W. Liu, T. T. Lu, F. Q. Liu, Detoxification of spent cathode carbon blocks from aluminum smelters by joint controlling temperature-vacuum process, Journal of Cleaner Production, 249 (2020) 119370. https://doi.org/10.1016/j.jclepro.2019.119370
[16] K. Yang, P. Y. Gong, Z. L. Tian, K. Peng, Y. Q. Lai, Carbon recovered from spent carbon cathode of aluminum reduction cell towards its valorisation as negative electrodes for lithium ion batteries, Diamond and Related Materials, 109 (2020) 108062. https://doi.org/10.1016/j.diamond.2020.108062
[17] J. Xiao, J. Yuan, Z. L. Tian, K. Yang, Z. Yao, B. L. Yu, L. Y. Zhang, Comparison of ultrasound-assisted and traditional caustic leaching of spent cathode carbon (SCC) from aluminum electrolysis, Ultrasonics Sonochemistry, 40 (2018) 21-29. https://doi.org/10.1016/j.ultsonch.2017.06.024
[18] J. Yuan, J. Xiao, F. C. Li, B. J. Wang, Z. Yao, B. L. Yu, L. Y. Zhang, Co-treatment of spent cathode carbon in caustic and acid leaching process under ultrasonic assisted for preparation of SiC, Ultrasonics Sonochemistry, 41 (2018) 608-618. https://doi.org/10.1016/j.ultsonch.2017.10.027
[19] Z. N. Shi, W. Li, X. W. Hu, B. J. Ren, B. L. Gao, Z. W. Wang, Recovery of carbon and cryolite from spent pot lining of aluminium reduction cells by chemical leaching, Transactions of Nonferrous Metals Society of China, 22 (2012) 222-227. https://doi.org/10.1016/S1003-6326(11)61164-3
[20] Z. Yao, Q. F. Zhong, J. Xiao, S. C. Ye, L. Tang, Z. A. Wang, Efficient separation of fluoride and graphite carbon in spent cathode carbon from aluminum electrolysis by mechanical activation assisted alkali fusion treatment, Minerals Engineering, 161 (2021) 106717. https://doi.org/10.1016/j.mineng.2020.106717
[21] Z. Yao, Q. F. Zhong, J. Xiao, S. C. Ye, L. Tang, Z. H. Zhang, An environmental-friendly process for dissociating toxic substances and recovering valuable components from spent carbon cathode, Journal of Hazardous Materials, 404 (2021) 124120. https://doi.org/10.1016/j.jhazmat.2020.124120
[22] K. X. Mao, L. Li, Reduction and dilution of converter copper slag with spent cathode carbon in aluminum electrolysis, Nonferrous Metals Engineering, 10 (2020) 65-72. (in Chinese). https://doi.org/10.3969/j.issn.2095-1744.2020.10.011
[23] S. Hong, W. Liu, F. Q. Liu, Preliminary study on reduction and extraction of copper and cobalt from copper converter slag by using waste cathode carbon block, Light Metals, 8 (2019) 41-45. (in Chinese). https://doi.org/10.13662/j.cnki.qjs.2019.08.009
[24] G. D. Wu, L. Li, K. Z. Li, Y. Yu, Dilution of Isa copper smelting slag by carbothermic reduction with waste cathode carbon, The Chinese Journal of Process Engineering, 10 (2021) 1-9. (in Chinese). https://doi.org/10.12034/j.issn.1009‑606X.220327
[25] K. X. Mao, L. Li, M. Xu, Iron and copper recovery from copper slags through smelting with waste cathode carbon from aluminium electrolysis, Journal of Central South University, 28 (2021) 2010−2021. https://doi.org/10.1007/s11771-021-4749-z
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