Harmless recovery and utilization of electrolytic aluminum spent cathode carbon block: A comprehensive review

Dong, Liangmin; Jiao, Fen; Liu, Wei; Gu, Siyu; Wang, Chen; Qin, Wenqing

doi:10.1016/j.jclepro.2023.139326

Cited by 14 publications

(2 citation statements)

References 111 publications

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“…Therefore, the recovery of spent aluminum electrolyte slag has both environmental and resource benefits. 15,16 First, acid leaching methods, such as sulfuric acid leaching, 17 hydrochloric acid leaching, 18 and nitric acid leaching, 19 have been proposed. Because the existing form of lithium in spent aluminum electrolyte slag is very complex, in addition to the existence of LiF, elements may also exist in the form of Li electrolysis, when Na 3 AlF 6 , Li 3 AlF 6 , Li 2 NaAlF 6 , and LiNa 2 AlF 6 encounter strong acids (such as dilute acid or nitric acid), they immediately decompose into various lithium salts.…”

Section: ■ Introductionmentioning

confidence: 99%

“…With the progress of electrolysis, the components in the electrolyte become more complex and difficult to use, are removed from the electrolytic cell, and are then deposited as waste. , These fluorine-containing wastes accumulate underground and not only pollute water resources and cause harm to the natural environment but are also harmful to human health. − At the same time, a large number of lithium-containing fluoride salts are produced in spent electrolytic aluminum, of which the lithium content ranges from 1 to 2.7% (as calculated according to Li + ), and these salts can be recycled as secondary lithium resources. Therefore, the recovery of spent aluminum electrolyte slag has both environmental and resource benefits. , …”

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%