Cu^2+-catalyzed mechanism in oxygen-pressure acid leaching of artificial sphalerite  

作　　者：Lei Tian Ao Gong Xuan-gao Wu Yan Liu Zhi-feng Xu Ting-an Zhang 

机构地区：[1]Institute of Green Metallurgy and Process Intensification,Jiangxi University of Science and Technology,Ganzhou 341000,China [2]Guangdong Institute of Resources Comprehensive Utilization,Guangzhou 510000,China [3]State Key Laboratory of Rare Metals Separation and Comprehensive Utilization,Guangzhou 510000,China [4]Key Laboratory for Ecological Utilization of Multimetallic Mineral,Ministry of Education,Northeastern University,Liaoning 110819,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2020年第7期910-923,共14页矿物冶金与材料学报（英文版）

基　　金：financially supported by the Joint Funds of the National Natural Science Foundation of China(Nos.51804136,U1402271,51764016);Jiangxi Province Nature Science Foundation,China(No.20181BAB216017);Jiangxi Science and Technology Landing Project,China(No.KJLD13046);Research Fund Program of State Key Laboratory of Rare Metals Separaten and Comprehensive Utilization,Guangzhou,China(No.GK-201803)。

摘　　要：The potential autoclave was used to study the catalytic mechanism of Cu^2+during the oxygen pressure leaching process of artificial sphalerite.By studying the potential change of the system at different temperatures and the SEM–EDS difference of the leaching residues,it was found that in the temperature range of 363–423 K,the internal Cu^2+formed a Cu S deposit on the surface of sphalerite,which hindered the leaching reaction,resulting in a zinc leaching rate of only 51.04%.When the temperature exceeds 463 K,the system potential increases steadily.The increase in temperature leads to the dissolution of the CuS,which is beneficial to the circulation catalysis of Cu^2+.At this time,the leaching rate of Zn exceeds 95%.In addition,the leaching kinetics equations at 363–423 and 423–483 K were established.The activation energy of zinc leaching at 363–423 and 423–483 K is 38.66 and 36.25 kJ/mol,respectively,and the leaching process is controlled by surface chemical reactions.

关 键 词：SPHALERITE electric potential autoclave copper(II)ions catalyst kinetics activation energy apparent reaction order 

分 类 号：TF813[冶金工程—有色金属冶金]