Clean Process for Selective Recovery of Lithium Carbonate from Waste Lithium-Bearing Aluminum Electrolyte Slag

Xu, Rui; Luo, Sha; Li, Wenzhang; Zhang, Chenyu; Chen, Zihao; Wang, Yue; Liu, Yang; Li, Jie

doi:10.1021/acs.iecr.3c01838

Cited by 4 publications

(2 citation statements)

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“…The significant leaching efficiency of lithium is 99.12%, while the leaching efficiencies of other elements, such as Ca and Al, are the lowest, and the recovery of leaching agents combined with the production of lithium carbonate and cryolite eliminates the generation of waste liquid or residue. 25 Some scholars have proposed the method of acid -base combined leaching. The lithium in the spent aluminum electrolyte slag is converted into LiF by repeated alkali leaching of the spent aluminum electrolyte slag, and then LiF precipitates into soluble LiF by acid leaching.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Selective leaching of lithium from lithium aluminum electrolyte residue can be accomplished using sodium carbonate solution as a leaching agent. The significant leaching efficiency of lithium is 99.12%, while the leaching efficiencies of other elements, such as Ca and Al, are the lowest, and the recovery of leaching agents combined with the production of lithium carbonate and cryolite eliminates the generation of waste liquid or residue . Some scholars have proposed the method of acid - base combined leaching.…”

Section: Introductionmentioning

confidence: 99%

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Cleaner Process for the Selective Extraction of Lithium from Spent Aluminum Electrolyte Slag

Zhang,

Liu,

Chen

et al. 2024

ACS Sustainable Chem. Eng.

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Spent aluminum electrolyte slag is a byproduct produced during the electrolysis of aluminum and contains elements such as F, Al, Na, and Li. It is a toxic and harmful substance with a stable and complex structure. As a consequence of fluorine pollution and low lithium recovery efficiency in the traditional hydro metallurgy process, a novel cleaner production technology was developed in this research. The lithium was selectively recovered and enriched from spent aluminum electrolyte slag by using calcium salt roasting transformation followed by HBL121solvent extraction. The new process realizes a high leaching efficiency of lithium, solidification of fluorine, low energy consumption, and improved lithium recovery in solutions with low concentrations of lithium. First, the spent aluminum electrolyte slag phase was reconstructed through a calcium sulfate roasting process, which solidified fluorine into CaF 2 and transformed lithium into Li 2 SO 4 . > 97% lithium can be selectively leached using only water leaching without inorganic acid. After removing calcium from the leaching solution, > 99% of lithium was selectively recovered by HBL121 solvent extraction. The concentration of lithium in the solution increased from 1.24 g/L to 15.56 g/L after stripping. Compared with traditional evaporation and concentration processes, the new process significantly reduces energy consumption, and the extractant can be recycled, resulting in lower recovery costs. Overall, this newly developed process for the selective transformation and enrichment of lithium from spent aluminum electrolyte slag has considerable environmental and economic advantages.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%