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http://dx.doi.org/10.7464/ksct.2021.27.2.139

Analysis of Dry Process Products for Recycling of Spent Secondary Batteries  

Kim, Jinhan (Department of Chemical Engineering, Kongju National University)
Kim, Yongcheol (Department of Chemical Engineering, Kongju National University)
Oh, Seung Kyo (Department of Chemical Engineering, Kongju National University)
Jeon, Jong-Ki (Department of Chemical Engineering, Kongju National University)
Publication Information
Clean Technology / v.27, no.2, 2021 , pp. 139-145 More about this Journal
Abstract
The purpose of this study is to recover valuable metals from spent batteries using a dry process. We focused on the effect of the smelting temperature on the composition of recovered solid and liquid products and collected gaseous products. After removal of the cover, the spent battery was left in NaCl solution and discharged. Then, the spent battery was made into a powder form through a crushing process. The smelting of the spent battery was performed in a tubular electric furnace in an oxygen atmosphere. For spent lithium-ion batteries, the recovery yield of the solid product was 80.1 wt% at a reaction temperature of 850 ℃, and the final product had 27.2 wt% of cobalt as well as other metals such as lithium, copper, and aluminum. Spent nickel-hydrogen batteries had a recovery yield of 99.2 wt% at a reaction temperature of 850 ℃ with about 37.6 wt% of nickel and other metals including iron. For spent nickel-cadmium batteries, the yield decreased to 65.4 wt% because of evaporation with increasing temperature. At 1050 ℃, the recovered metals were nickel (41 wt%) and cadmium (12.9 wt%). Benzene and toluene, which were not detected with the other secondary waste batteries, were detected in the gaseous product. The results of this study can be used as basic data for future research on the dry recycling process of spent secondary batteries.
Keywords
Spent battery; Portable secondary battery; Recycling; Dry process; Smelting;
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