“…Mo, Sb, and rare and precious metals, such as, Au and Ag ( Jiang et al, 2016 ), have a comparatively low concentration. The research reports that a number of methods of recovering metal from circuit boards in China and abroad are dominated by physical separation extractive techniques such as magnetic separation, electrical separation, eddy current separation ( Zheng et al, 2016 ; Gu et al, 2019 ), pyrometallurgy ( Park and Kim, 2019 ; Habibi et al, 2020 ; Yue et al, 2021 ), hydrometallurgy ( Díaz-Martínez et al, 2019 ), Bio-hydrometallurgy ( Gu, 2016 ), and other extractive techniques. Due to the characteristics of e-waste, including its large quantity, complicated constituents, great harm, high potential value, and difficulty in treatment ( Cao et al, 2003 ; Zhu et al, 2018 ), the recovery of valuable metals is the focus of attention for metal resource recovery from e-waste.…”