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2 2021

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Study on Recovery of Valuable Metals in Spent Lithium-Ion Batteries by Al2O3-SiO2-CaO-Fe2O3 Slag System

Moon Tae Boong, Han Chulwoong, Hyun Soong-Keun, Park Sung Cheol, Son Seong Ho, Lee Man Seung, Kim Yong Hwan

Archives of Metallurgy and Materials

2021

Vol. 66, iss. 4

983--986

This study investigated the recovery behavior of valuable metals (Co, Ni, Cu and Mn) in spent lithium ion-batteries based on Al2O3-SiO2-CaO-Fe2O3 slag system via DC submerged arc smelting process. The valuable metals were recovered by 93.9% at the 1250°C for 30 min on the 20 Al2O3-40SiO2-20Cao-20Fe2O3 (mass%) slag system. From the analysis of the slag by Fourier-transform infrared spectroscopy, it was considered that Fe2O2 and Al2O3 acted as basic oxides to depolymerize SiO4 and AlO4 under the addition of critical 20 mass% Fe2O3 in 20 Al2O3-40SiO2-Cao-Fe2O3 (Cao + Fe2O3 = 40 mass%). in addition, it was observed that the addition of Fe2O3 ranging between 20 and 30 mass% lowers the melting point of the slag system.

Effect of Flux on the Recovery Behavior of Valuable Metals during the Melting Process of Aluminum Can Scrap

Han Chulwoong, Kim Yong Hwan, Kim Dae-Geun, Lee Man Seung

Archives of Metallurgy and Materials

2021

Vol. 66, iss. 4

1023--1027

This study investigated the effect of flux type and amounts on recovery behavior of aluminum alloy during the melting process of Al can scrap. The heat treatment was conducted to remove the coating layer on the surface of can scrap at 500°C for 30 min. The molten metal treatment of the scrap was performed at 750°C in a high-frequency induction furnace with different flux types and amounts. It was observed that the optimum condition for recovery of Al alloy was to add about 3 wt.% flux with a salt and MgCl2 mixing ratio of 70:30 during melting process. The mechanical properties of recovered Al alloy were about 254.8 mPa, which is similar to that of the virgin Al5083 alloy.