Stepwise recovery of Zn,In,Ga,and Fe from jarosite residue through oxidizing roasting−direct reduction−smelting−electrorefining process  

基于氧化焙烧-直接还原-熔分-电解精炼工艺从铁矾渣中分步回收锌、铟、镓和铁

作　　者：De-qing ZHU Tao DONG Jian PAN Zhen-qi GUO Cong-cong YANG Yu-xiao XUE 朱德庆;董韬;潘建;郭正启;杨聪聪;薛钰霄(中南大学资源加工与生物工程学院,长沙410083;重庆大学材料科学与工程学院,重庆400045)

机构地区：[1]School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China [2]College of Materials Science and Engineering,Chongqing University,Chongqing 400045,China

出　　处：《Transactions of Nonferrous Metals Society of China》2025年第2期640-652,共13页中国有色金属学报(英文版)

基　　金：Hunan Provincial Key Research and Development Project, China (No. 2022SK2075);National Natural Science Foundation of China (No. 52004339)。

摘　　要：An efficient process based on oxidizing roasting−direct reduction−smelting−electrorefining was developed to separate and recover Zn,In,Ga and Fe from a typical hazardous jarosite residue.Phase transformation and element migration during each separating process were evaluated by X-ray diffraction analysis(XRD),thermo-gravimetric−differential scanning calorimetry(TG−DSC),and scanning electron microscopy−energy dispersive spectrometry(SEM−EDS).The results show that the jarosite residue decomposed into hematite and zinc ferrite when oxidizing roasted at 1250℃ for 20 min.Then,Zn and In were volatilized and enriched into flue dust through the reductive roasting of oxidized pellets at 1200℃ for 60 min.Finally,Fe and Ga were separated by smelting−electrorefining of the reduced pellets to obtain high purity iron powder with 99.5%Fe and anode slime with 456 g/t Ga.Through the process,a total recovery of 97.42%Zn,87.86%In,90.70%Fe and 84.78%Ga can be achieved.采用氧化焙烧-直接还原-熔炼-电解精炼工艺从典型有害铁矾渣中高效分离回收锌、铟、镓和铁。采用X射线衍射(XRD)、热重-差热法(TG-DSC)和扫描电镜-能谱分析(SEM-EDS)对各分离过程中的相变及元素迁移进行表征。结果表明:铁矾渣在1250℃氧化焙烧20 min后转变为赤铁矿和铁酸锌;将得到的氧化球团在1200℃下还原60 min,锌和铟挥发并富集于烟尘中;最后对还原球团进行熔炼及电解精炼分离铁和镓,得到铁含量为99.5%的高纯铁粉和镓含量为456 g/t的富镓阳极泥。该工艺可实现锌、铟、铁和镓的总回收率分别为97.42%、87.86%、90.70%和84.78%。

关 键 词：jarosite residue gallium indium RECOVERY ELECTROREFINING 

分 类 号：TG1[金属学及工艺—金属学]