博士生刘松霖论文“Causticizition of electrolytic aluminum slag for selective lithium recovery and fluorine fixation”被Journal of Hazardous Materials接收发表
发布时间：2025-08-28
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Electrolytic aluminum slag (EAS) is a secondary resource containing lithium and hazardous waste with high soluble fluorine content. In this paper, a Ca(OH)2 causticizing strategy is proposed for selective lithium recovery and fluorine leakage elimination from EAS. The impurities in EAS are causticized by Ca(OH)2 and transformed into CaF2, CaAl2Si2O8 and Ca3Al2(OH)12, causing the impurities in EAS to precipitate and separate from the Li dissolved in the solution. Under optimized conditions (80 ◦C, 60 min, Ca/E: 0.6, L/S: 10), the leaching efficiencies of Li, Al, Si and F are 99.06 %, 0.41 %, 0.80 % and 1.14 % respectively. Kinetic research shows that the leaching of Li conforms to the shrinking core model and is controlled by a mixture of solid phase diffusion and chemical reaction. Finally, Li in the solution is recovered through carbonization and precipitation, and the recovery efficiency of Li is 94.41 %. Meanwhile, F in causticizing slag shows high stability in the simulated acid rain leach agent. In summary, the causticizing of EAS proposed in this study is a hazardous waste management strategy with economic and environmental benefits.
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