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2 Archives of Metallurgy and Materials

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.

A Study on the Durability of Dimensionally Stable Electrode in High-Rate Electroplating Process Condition Using Accelerated Life Test

Park Sung Cheol, Jung Yeon Jae, Koo Seokbon, Lee Kee-Ahn, Son Seong Ho

Archives of Metallurgy and Materials

2021

Vol. 66, iss. 3

675--678

In order to the long-term stability of DSE for electroplating process, the lifetime equations were calculated from the results of the accelerated life testing, and the lifetime of DSE was predicted. The nano-embossing pre-treatment led to 2.65 times in the lifetime of DSE. The degradation mechanism of DSE with a thick metal oxide layer for applied highly current density process condition was identified. The improvement of durability of DSE seems to be closely related to adhesion between titanium plate and mixed metal oxide layer.