博士生刘松霖论文"Stepwise recovery of valuable elements and regeneration of cryolite from electrolytic aluminum slag"被Separation and Purification Technology接收发表
发布时间：2025-11-11
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Electrolytic aluminum slag (EAS) is a secondary resource containing lithium-aluminum and a hazardous waste containing fluorine. This paper proposed a Ca(OH)2-H2SO4 causticizing-acid leaching strategy for the stepwise recovery of lithium (Li) and cryolite from EAS. Causticizing effectively separated Li from aluminum (Al), achieving 97.8% of Li leaching and 99.5% of Al precipitation. CaF2, Ca3Al2(OH)12 and CaAl2Si2O8 in causticizing slag were transformed into 11CaO·7Al2O3·CaF2 and 3CaO·2SiO2·CaF2 during ashing at 800 oC, reducing the encapsulation and adsorption of Al-containing phases by the in-situ formed silica gel during acid leaching. Under optimized conditions, the leaching efficiency of Al increased to 99.7%. By optimizing purification conditions through simulation calculations, the removal efficiencies of silicon (Si) and iron (Fe) from the Al leachate reached 98.5% and 95.3%, respectively. High-purity cryolite was subsequently prepared, and the recovery yield of Al throughout the entire strategy reached 93.1%. Finally, economic evaluation and life cycle analysis confirmed the economic feasibility and environmental impact of the strategy, fully demonstrating its potential on an industrial scale. This study provides a feasible strategy for the recovery of high-value elements from EAS and highlights the promoting role of targeted phase transformations in leaching for Al.
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