流动电解池传质强化汞电还原回收研究  

Study on Mass Transfer Enhancement of Mercury Electroreduction Recovery in a Flow Electrolytic Cell

作　　者：陈昊 鲍鼎 沈宗喜 石礼 陆占清 邬俊 沈锋华 向开松 刘恢 CHEN Hao;BAO Ding;SHEN Zongxi;SHI Li;LU Zhanqing;WU Jun;SHEN Fenghua;XIANG Kaisong;LIU Hui(School ofMetallurgy and Environment,Central South University,Changsha 410083,China;State Key Laboratory ofAdvanced Metallurgy for Non-ferrous Metals,Changsha 410083,China;Chinese National Engineering Research Center for Control&Treatment ofHeavy Metal Pollution,Changsha 410083,China;Yunnan Keli Environmental Protection Joint Stock Company,Kunming 650031,China;Yunnan Chihong Zinc&Germanium Co.,Ltd.,Qujing 655011,China)

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083 [2]有色金属强化冶金新技术全国重点实验室,湖南长沙410083 [3]国家重金属污染防治工程技术研究中心,湖南长沙410083 [4]云南科力环保股份公司,云南昆明650031 [5]云南驰宏锌锗股份有限公司,云南曲靖655011

出　　处：《湖南有色金属》2024年第6期24-29,共6页Hunan Nonferrous Metals

基　　金：国家自然科学基金重点项目(52234011)。

摘　　要：湿法电化学回收技术是实现汞资源利用的绿色路径,但其应用面临传质受限导致还原回收产率低等问题。基于流动电解强化传质的策略,开发了流动电解还原汞装置,汞回收率达到87.26%,相较H型电解池提升50.16%,反应动力学常数是静止模式的4.6倍。在5 mL/min电解液流速、30℃与-1.5 V还原电位的最佳条件下,最大法拉第效率达78.29%,汞还原产率为9.91 mg/(h·cm^(2)),汞产品纯度超97%。流场模拟结果表明流动电解能够减小界面扩散层厚度、缩短Hg^(2+)迁移距离,进而加快Hg^(2+)的表面更新,强化汞电还原回收。Hydrometallurgical electrochemical recovery technology offers a green pathway for mercury resource utilization,but its application faces challenges such as low reduction recovery efficiency caused by mass transfer limitations.To address this,a novel platform for mercury electroreduction based on flow electrolytic cells was developed to enhance mass transfer.The mercury recovery efficiency of the flow electrolytic cell reached 87.26%,representing a 50.16%improvement compared to the H-type electrolytic cell,with a reaction kinetic constant k 4.6 times higher than that of the static mode.Under optimal conditions,an electrolyte flow rate of 5 mL/min,an temperature of 30℃,and a reduction potential of-1.5 V,the system achieved a maximum Faradaic efficiency of 78.29%,a mercury reduction yield of 9.91 mg/(h·cm^(2)),and a product purity exceeding 97%.Simulation of the flow field indicated that the flow electrolytic process reduces the diffusion layer thickness,shortens the migration distance of Hg^(2+),and accelerates the surface renewal of Hg^(2+),enhancing electroreduction recovery of mercury.

关 键 词：电还原 流动电解池 汞 湿法回收 

分 类 号：TF819.1[冶金工程—有色金属冶金]