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Na_(2)SO_(4)-NaCl binary eutectic salt roasting to enhance extraction of lithium from pyrometallurgical slag of spent lithium-ion batteries

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Chinese Journal of Chemical Engineering 2022年第1期35卷 294-300页

作者： Hui Dang Zhidong Chang Xue Wu Sihang Ma Yifei Zhan Na Li Wenbo Liu Wenjun Li Hualei Zhou Changyan Sun Department of Chemistry and Chemical Engineering School of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083China Institute of Biophysics Chinese Academy of SciencesBeijing 100101China

Effectively extracting lithium at a relatively low temperature from the slag produced by the pyrometallurgical treatment of spent lithium-ion batteries remains a great challenge,which limits the acquirement of ***,we proposed a eutectic system to roast slag at a lower temperature based on sodium sulfate-sodium chloride(Na_(2)SO_(4)-NaCl)binary eutectic *** optimal roasting conditions are as follows:the slag was roasted at 750℃with a(SO_(4)^(2-)+Cl^(-))/Li+molar ratio of 5:1 for 120 *** by aqueous leaching 5 min at room temperature with a water/roasted samples mass ratio of 30:1,it can get 97.07%lithium extraction efficiency.

关键词： Spent lithium-ion battery Lithium recovery silicate structure Binary eutectic salt roasting

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Extraction of lithium from the simulated pyrometallurgical slag of spent lithium-ion batteries by binary eutectic molten carbonates

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International Journal of Minerals,Metallurgy and Materials 2022年第9期29卷 1715-1721页

作者： Hui Dang Zhidong Chang Hualei Zhou Sihang Ma Min Li Jialing Xiang Department of Chemistry and Chemical Engineering School of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083China

The effective and low-temperature extraction of lithium from the pyrometallurgical slag of spent lithium-ion batteries(LIBs)remains a great ***,potassium carbonate/sodium carbonate(K_(2)CO_(3)/Na_(2)CO_(3)),which could form a eutectic molten salt system at 720℃,was used as a roasting agent to extract lithium from pyrometallurgical *** was successfully extracted from the slag by K_(2)CO_(3)/Na_(2)CO_(3) roasting followed by water *** calculation results indicate that the lengths of Li-O bonds increase after K^(+)/Na^(+)adsorption,resulting in the easy release of Li^(+)from the LiAlSi_(2)O_(6) lattice after roasting with K_(2)CO_(3)/Na_(2)CO_(3).Thermogravimetry-differential scanning calorimetry results indicate that the eutectic phenomenon of K_(2)CO_(3) and Na_(2)CO_(3) could be observed at 720℃ and that the reaction of the slag and eutectic molten salts occurs at temperatures above 720℃.X-ray diffraction results suggest that Li^(+)in the slag is exchanged by K^(+)in K_(2)CO_(3) with the concurrent formation of KAlSiO_(4),while Na_(2)CO_(3) mainly functions as a fluxing *** lithium extraction efficiency can reach 93.87%under the optimal conditions of a roasting temperature of 740℃,roasting time of 30 min,leaching temperature of 50℃,leaching time of 40 min,and water/roasted sample mass ratio of 10:*** work provides a new system for extracting lithium from the pyrometallurgical slag of spent LIBs.

关键词： spent lithium-ion battery lithium recovery silicate structure low roasting temperature binary eutectic carbonates roasting

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