P204顺序萃取分离电镀污泥中铁铝镍试验研究  

Extraction and Separation of Iron,Aluminum and Nickel from Electroplating Sludge by P204 Stepwise Extraction Process

作　　者：罗振 兰馨 曲展 朱遂一 LUO Zhen;LAN Xin;QU Zhan;ZHU Suiyi(Xindu Environment Technology Co.,Ltd.,Wuxi 214200,China;College of Resource and Environment,Zhongkai University of Agriculture and Engineering,Guangzhou 510000,China;Institute for the Environment and Health,Nanjing University,Suzhou 215000,China)

机构地区：[1]无锡市新都环保科技有限公司,江苏无锡214200 [2]仲恺农业工程学院资源与环境学院,广东广州510000 [3]南京大学环境学院环境与健康研究院,江苏苏州215000

出　　处：《湿法冶金》2024年第5期559-565,共7页Hydrometallurgy of China

基　　金：国家自然科学基金项目(52200156);江苏省社会发展面上项目(BE2023697)。

摘　　要：研究了采用P204萃取剂按顺序萃取分离电镀污泥中杂质铁铝和重金属镍,探讨了pH对萃取过程的影响机制。结果表明:电镀污泥经硫酸预处理后所得浸出液富含镍,所得不溶物主要为硫酸钙和硅;以20%P204+80%磺化煤油作为有机相,在萃取相比V_(O)/V_(A)=1/1、电镀污泥浸出液初始pH=0.9条件下,铁和铝萃取率分别达99.9%和97.6%,而镍损失率低于2%;将萃余液pH调至4.5,以15%P204+85%磺化煤油为有机相,在萃取相比V_(O)/V_(A)=1/1条件下,经过4级萃取,镍萃取率可达98%;用2 mol/L硫酸进行4级反萃取,所得富镍反萃液经蒸发结晶可得镍质量分数为22%的硫酸镍晶体。Extraction and separation of iron,aluminum and heavy metal nickel from electroplating sludge by P204 stepwise extraction process was studied.The effect of pH on the extraction process was discussed.The results show that the leaching solution of electroplating sludge after pretreatment with sulfuric acid was rich in nickel,and the insoluble substances were mainly calcium sulfate and silicon.Using 20%P204+80%sulfonated kerosene as organic phase,the extraction rates of Fe and Al can reach 99.9%and 97.6%,respectively,while the nickel loss rate is less than 2%under the conditons of V_(O)/V_(A)=1/1,electroplating sludge leaching solution nitial pH=0.9.When the pH of the raffinate is adjusted to 4.5,V_(O)/V_(A)=1/1,and the organic phase is 15%P204+85%sulfonated kerosene,the nickel extraction rate can reach 98%after four-stage extraction.The nickel-rich solution is obtained by four-stage strripping with 2 moL/L sulfuric acid,and nickel sulfate crystals with 22%nickel mass fraction are obtained by evaporation and crystallization.

关 键 词：电镀污泥 P204 萃取 镍 铁 铝 分离 硫酸 

分 类 号：TF804.2[冶金工程—有色金属冶金] TF815