Oxygen-assisted zinc recovery from electric arc furnace dust using magnesium chloride  

作　　者：Jingdong Huang Xiao Yang 

机构地区：[1]School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China [2]School of Engineering,Westlake University,Hangzhou 310030,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第10期2300-2311,共12页矿物冶金与材料学报（英文版）

摘　　要：Electric arc furnace(EAF)dust is an important secondary resource containing metals,such as zinc(Zn)and iron(Fe).Recover-ing Zn from EAF dust can contribute to resource recycling and reduce environmental impacts.However,the high chemical stability of ZnFe_(2)O_(4)in EAF dust poses challenges to Zn recovery.To address this issue,a facile approach that involves oxygen-assisted chlorination using molten MgCl_(2)is proposed.This work focused on elucidating the role of O2 in the reaction between ZnFe_(2)O_(4)and molten MgCl_(2).The results demonstrate that MgCl_(2)effectively broke down the ZnFe_(2)O_(4)structure,and the high O2 atmosphere considerably promoted the sep-aration of Zn from other components in the form of ZnCl_(2).The presence of O2 facilitated the formation of MgFe_(2)O_(4),which stabilized Fe and prevented its chlorination.Furthermore,the excessive use of MgCl_(2)resulted in increased evaporation loss,and high temperatures pro-moted the rapid separation of Zn.Building on these findings,we successfully extracted ZnCl_(2)-enriched volatiles from practical EAF dust through oxygen-assisted chlorination.Under optimized conditions,this method achieved exceptional Zn chlorination percentage of over 97%within a short period,while Fe chlorination remained below 1%.The resulting volatiles contained 85wt%of ZnCl_(2),which can be further processed to produce metallic Zn.The findings offer guidance for the selective recovery of valuable metals,particularly from solid wastes such as EAF dust.

关 键 词：electric arc furnace dust ZINC OXYGEN magnesium chloride CHLORINATION 

分 类 号：TF813[冶金工程—有色金属冶金]