采用还原-磁化焙烧法从高铁锌焙砂中选择性浸出锌  

Selective extraction of zinc from high iron-bearing zinc calcine by reduction and magnetization roasting

作　　者：张添富 韩俊伟[1] 刘森 刘维[1] 李琛 焦芬[1] 覃文庆[1] Tian-fu ZHANG;Jun-wei HAN;Sen LIU;Wei LIU;Chen LI;Fen JIAO;Wen-qing QIN(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学资源加工与生物工程学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第11期3514-3528,I0001,共16页中国有色金属学报（英文版）

基　　金：supports from the National Natural Science Foundation of China(Nos.52174269,51874356);the National Key R&D Program of China(Nos.2019YFC1907301,2020YFC1909203,2018YFC1900301,2018YFC1902500);the Landmark Innovation Demonstration Project of Hunan Province,China(No.2019XK2304);the Innovation Driven Project of Central South University,China(No.2020CX038);the Natural Science Foundation of Hunan Province,China(No.2019JJ50805);the Scientific Research Starting Foundation of Central South University,China(No.218041).

摘　　要：为实现高铁锌焙砂中锌的选择性浸出,提出一种将还原焙烧与磁化焙烧相结合以强化铁酸锌选择性分解的新工艺。通过热力学分析和焙烧实验,详细研究铁酸锌的分解机理。结果表明,在8%CO(体积分数)、750℃、50%CO/(CO+CO_(2))(体积分数)和90 min的最佳还原焙烧条件下,锌焙砂中94.65%的铁酸锌被还原分解为氧化锌和氧化亚铁。随后,还原焙砂在450℃的空气气氛中磁化焙烧30 min后,焙砂中的氧化亚铁被选择性地磁化为四氧化三铁。磁化焙砂经低酸浸出后,焙砂中93.62%的锌被浸出进入溶液,而90%以上的铁以磁铁矿的形式富集在浸出渣中,浸出渣中的铁可通过磁选法进一步回收。A novel process that combined reduction roasting with magnetization roasting was developed to intensify the decomposition of zinc ferrite for the selective extraction of zinc from high iron-bearing zinc calcine.The decomposition mechanism of zinc ferrite was investigated in detail by thermodynamics analysis and roasting experiments.The results indicated that 94.65%of the zinc ferrite was decomposed into zinc oxide and ferrous oxide under the optimal reduction roasting conditions of 8 vol.%CO,750℃,50 vol.%CO/(CO+CO_(2)),and 90 min.The generated ferrous oxide was further converted to ferriferrous oxide by magnetization roasting under an air atmosphere at 450℃for 30 min.After that,93.62%of zinc contained in the calcine could be selectively extracted by low acid leaching,whereas more than 90%of iron was concentrated in the leaching slag in the form of magnetite,which could be recovered by the subsequent magnetic separation.

关 键 词：铁酸锌 锌焙砂 还原焙烧 磁化焙烧 酸性浸出 

分 类 号：TF813[冶金工程—有色金属冶金]