Preparation and performance of 3D-Pb anodes for nonferrous metals electrowinning in H2SO4 aqueous solution  

硫酸体系有色金属电沉积用3D-Pb阳极的制备与性能（英文）

作　　者：Xiao-cong ZHONG Bin ZHANG Zhen-cong LIN Jia-ming LIU Yong-min XIE Zhi-feng XU 钟晓聪;张斌;林振聪;刘嘉铭;谢永敏;徐志峰(江西理工大学冶金工程学院,赣州341000;广东省稀有金属研究所,广州510650;稀有金属分离与综合利用国家重点实验室,广州510650)

机构地区：[1]School of Metallurgical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China [2]Guangdong Institute of Rare Metals,Guangzhou 510650,China [3]State Key Laboratory of Rare Metals Separation and Comprehensive Utilization,Guangzhou 510650,China

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第2期535-547,共13页中国有色金属学报（英文版）

基　　金：Project(51704130)supported by the National Natural Science Foundation of China;Project(GK-201905)supported by the Research Fund of State Key Laboratory of Rare Metals Separation and Comprehensive Utilization,China;Project(jxxjbs16026)supported by the Doctoral Scientific Research Foundation of Jiangxi University of Science and Technology,China

摘　　要：The effects of Pb^2+concentration,current density,deposition time and temperature on Pb deposit structure were investigated.In lower Pb^2+concentration(~0.15 mol/L),carambola-like 3D-Pb structure was constructed,while in higher Pb2+concentration(≥0.30 mol/L),Pb deposits exhibited pyramid-like structure.Furthermore,the oxide layer and anodic potential of carambola-shaped 3D-Pb(Cara-Pb)and pyramid-shaped 3D-Pb(Pyra-Pb)anodes were investigated and compared with those of fresh Pb anode.After 72 h galvanostatic electrolysis(50 mA/cm2)in 160 g/L H2SO4 solution,the oxide layer on Pyra-Pb was much thicker than that on Cara-Pb and Pb anodes,which remarkably relieved intercrystalline corrosion of the metallic substrate.Additionally,the oxide layer on Pyra-Pb anode presented a larger surface area and higher PbO2 content.Hence,Pyra-Pb anode showed a 40 m V lower anodic potential compared to Cara-Pb and Pb anodes.In sum,Pyra-Pb anode had a potential to decrease energy consumption and prolong the life span of traditional Pb anode.研究Pb^2+浓度、电流密度、沉积时间和温度对沉积Pb结构的影响。在低Pb^2+浓度条件下(~0.15 mol/L),Pb沉积物呈杨桃状,而在高Pb2+浓度条件下(≥0.30 mol/L),Pb沉积物呈立锥状。进一步对比研究杨桃状Pb阳极(Cara-Pb)、立锥状Pb阳极(Pyra-Pb)和Pb阳极的氧化膜层和阳极电位。在160 g/L H2SO4溶液中恒流极化(50 mA/cm^2)72 h后,Pyra-Pb阳极氧化膜层厚度大于Cara-Pb和Pb阳极,进而显著减缓金属基底的晶界腐蚀。此外,Pyra-Pb阳极氧化膜层具有更大表面积和更高Pb O2含量,因此,极化72 h后Pyra-Pb阳极电位较Cara-Pb和Pb阳极的低40mV。综上,在Pb阳极表面构建立锥状3D-Pb结构具有降低电沉积能耗、延长阳极寿命的潜力。

关 键 词：electrochemical deposition 3D-Pb structure growth mechanism oxide layer anodic potential 

分 类 号：TQ153.1[化学工程—电化学工业]