(1. 中南大学冶金与环境学院，长沙410083；
2. 中南大学国家重金属污染防治工程技术研究中心，长沙410083)
摘 要: 针对锌浸渣中锌难于选择性浸出回收的难题，提出硫酸铵焙烧-选择性浸出回收锌的新工艺。该工艺通过硫酸铵焙烧改变锌浸渣中锌铁物相，在浸出过程对锌进行选择性浸出回收。研究硫酸铵加入量、焙烧温度、焙烧时间等工艺参数对铁酸锌分解和锌铁浸出的影响，并获得最佳的工艺参数，即硫酸铵和铁酸锌质量比为4、一段焙烧温度和时间分别为450 ℃和90 min，二段焙烧温度和时间分别为650 ℃和60 min。在该条件下，锌浸出率可以达到92.63%，而铁的浸出率仅为2.04%，实现了锌浸渣中锌的选择性浸出。
关键字: 锌浸渣；铁酸锌；硫酸铵焙烧；锌回收
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution,
Central South University, Changsha 410083, China）
Abstract:In order to solve the difficulty of selective leaching zinc from zinc leaching residue (ZLR), a novel process for recovery zinc from ZLR was developed by ammonia sulfate roasting-selective leaching. The phases of zinc and iron from ZLR were adjusted by roasting with ammonia sulfate before zinc was leached selectively with water. The effects of various parameters, such as ammonium sulfate addition, roasting temperature and time on decomposition rate of zinc ferrite and extractions rates of zinc and iron were investigated. The optimal experimental conditions are gotten as follows: ammonium sulfate to zinc ferrite mass ratio of 4/1, roasting temperature of 450 ℃ and time of 90 min for the first stage, roasting temperature of 650 ℃ and time of 60 min for the second stage. The extraction rate of zinc increases to 92.63% with the 2.04% extraction rate of iron under the optimal experimental conditions. Zinc can be selectively recovered from ZLR by the new process.
Key words: zinc leaching residue; zinc ferrite; ammonia sulfate roasting; zinc recovery
