博士生刘松霖论文"Selective recovery of lithium from waste aluminum electrolyte and regeneration of potassium-rich aluminum electrolyte"被Waste Management接收发表
发布时间：2026-08-17
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Waste aluminum electrolyte (WAE) is a hazardous waste with recycling value, while current disposal technologies lack selectivity in extraction of lithium (Li), and the residue lacks usability. In this paper, a K2SO4 roasting strategy is proposed for selective Li recovery and regeneration of potassium-rich aluminum electrolyte from WAE. The mechanism of the transformation of key phases during roasting is elucidated. Specifically, the Na2LiAlF6 in WAE undergoes ion exchange with K2SO4, converting into K2NaAlF6, KNaLi2 (SO4)2, and KLiSO4, thereby enabling the dissolution and separation of Li. Under optimized conditions, the leaching efficiency of Li is 89.7%. The main phases of the residue are K2NaAlF6, Al2O3, and CaF2, which can be utilized as potassium-rich aluminum electrolytes in the field of low-temperature aluminum electrolysis. Li in the leachate is recovered through the precipitation method with a recovery efficiency of 81% in the entire strategy. Finally, the economic feasibility and industrialization potential of the strategy are indicated through economic evaluation and lifecycle analysis. The study provides an efficient strategy for aluminum smelters to extract high-value Li from WAE and regenerate fresh aluminum electrolyte.