EDTA和EDTA+CA浸出电镀污泥中铜的动力学  

Leaching Kinetics of Copper from Electroplating Sludge by EDTA and EDTA+CA

作　　者：邓迪 邓春健[1] 刘婷婷 薛丁乾 邬嘉仪 DENG Di;DENG Chun-jian;LIU Ting-ting;XUE Ding-qian;WU Jia-yi(School of Environment and Chemical Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学环境与化学工程学院,南昌330063

出　　处：《有色金属（冶炼部分）》2022年第12期23-28,共6页Nonferrous Metals（Extractive Metallurgy)

基　　金：江西省“双千万计划”人选资助项目(JXSQ2019201019)。

摘　　要：采用EDTA和EDTA+柠檬酸(CA)两种浸出剂浸出电镀污泥中金属铜,重点研究了EDTA浓度、EDTA+CA中CA的比例、温度对金属铜浸出的影响,并分析了浸出动力学。结果表明,在EDTA浓度70 mmol/L、温度55℃、浸出时间3 h的条件下对铜的浸出率达到了80.61%,而70 mmol/L EDTA+10 mmol/L CA、温度55℃、浸出时间3 h的条件下对铜的浸出率为90.32%。浸出过程可用Avrami方程加以描述,EDTA和EDTA+CA浸出反应表观活化能分别为43.00、45.74 kJ/mol,浸出均属于混合控制且以表面化学控制为主导。The metallic copper in electroplating sludge was leached by two leaching agents, EDTA and EDTA mixed with citric acid(EDTA+CA).The effects of EDTA concentration, ratio of CA in EDTA+CA,and temperature on leaching of copper were studied, and the leaching kinetics was analyzed.The results show that copper leaching rate by EDTA is 80.61% under the conditions including EDTA concentration of 70 mmol/L,temperature of 55 ℃,and leaching time of 3 h, while copper leaching rate by EDTA+CA is 90.32% under the conditions including 70 mmol/L EDTA+10 mmol/L CA,temperature of 55 ℃,and leaching time of 3 h.The leaching process can be described by Avrami equation, and the apparent activation energies of EDTA and EDTA+CA leaching reactions are 43.00 and 45.74 kJ/mol, respectively.The leaching is all mixed control and dominated by surface chemical control.

关 键 词：EDTA 柠檬酸 电镀污泥 铜 浸出动力学 Avrami模型 

分 类 号：X758[环境科学与工程—环境工程] TF811[冶金工程—有色金属冶金]