分步电沉积与选择性沉淀技术回收混合电镀污泥中的重金属.PDF

Scientific Journal of Frontier Chemical Development SJFCD 分步电沉积与选择性沉淀技术回收混合电镀污泥中的 重金属 1* 2 1 1 彭昌盛 ，谷庆宝，李盼盼，晋瑞杰 1. 中国海洋大学海洋环境与生态教育部重点实验室，山东 青岛 266100 2. 中国环境科学研究院，北京 100012 摘 要：研究了一种通过酸浸、黄铵铁矾沉淀和电沉积联合方法回收电镀污泥中铜、镍、铬、铁等重金属的工艺流程。首先 在对实际电镀污泥进行充分理化性质和重金属含量测定的基础上，采用10%硫酸用作浸出剂，浸滤出电镀污泥中97%的铜、 镍和铬，以及84%的铁。再通过第一步电沉积过程回收酸浸液的铜，这一过程中对一些操作参数（如槽电压、pH和电极材 料）进行了优化，铜的回收率可以达到99%。铜回收后，经黄铵铁矾沉淀去除铁和铬，几乎99.9%的铁铬渣被沉淀出来。最 后，剩余的溶液通过镍的电沉积对其中的镍进行回收，在pH5.5 、电压5.5V的条件下约有58%的镍被回收。 关键词：电镀污泥；重金属回收；酸浸；电沉积；黄铵铁矾沉淀 Heavy Metals Recovery from Electroplating Sludge by Multi-Steps of Electrodepositing and Precipitating 1 * 2 1 1 Changsheng Peng , Qingbao Gu , Panpan Li , Ruijie Jin 1 The Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao, 266100 2 Chinese Research Academy of Environmental Sciences, Beijing, 100012 Abstract: A combined processes of acid-leaching, electrodepositing and ammonium jarosite precipitating was developed to recover heavy metals from an electroplating sludge. More than 97% of copper, nickel, chromium, and 84% of iron were extracted from the sludge with 10% H SO leaching. More than 99% of copper was recovered from the leaching solution with electrodepositing process. 2 4 The left solution after copper recovery was then treated with ammonium jarosite precipitating process, about 99.9% of chromium and iron could be deposited as chromium ferrite in this process. Finall