从含重金属废水中回收铅、汞的研究  

Recovery of Lead and Mercury from Wastewater Containing Heavy Metals

作　　者：李骞[1] 邓蓬 杨永斌[1] 姜涛[1] 陈达佳[1] 

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《矿冶工程》2015年第2期75-79,共5页Mining and Metallurgical Engineering

摘　　要：在研究单一体系中铅/汞回收的基础上,采用分步硫化沉淀浮选法对含Pb2+、Hg2+混合废水中铅/汞的分离回收进行了研究。试验结果表明:向混合废水中加入Hg2+1.1倍当量Na2S,反应12min,加入丁黄药45mg/L,浮选5min,浮选后的废水再加入Pb2+1.5倍当量Na2S,反应12min,加入丁黄药25mg/L,浮选5min,铅和汞回收率均达99.90%以上。经该方法处理后的废水中残余重金属含量均低于GB8979-1996一级标准。浮渣中汞品位为32.42%,铅品位为83.25%,具有极高的资源回收价值。After an investigation on recovering lead and mercury from the single contamination system, fractional sulfide precipitation-flotation technique was adopted to separate lead from mercury in the mixed wastewater containing both Pb^2＋ and Hg〉. The experiment ：included first precipitation for 12 minutes after adding Na2S with the dosage equivalent of 1.1 times the concentration of Hg^2＋, plus flotation for 5 minutes with 45 mg/L butyl xanthate as the collector. The flotation wastewater was then floated for 5 minutes with 25 mg/L butyl xanthate after adding Na2S with a dosage 1.5 times the concentration of Pb^2＋ and further precipitated for 12 minutes. Results showed the recoveries of both lead and mercury exceed 99.90%. After the treatment, the contents of residual heavy metal ions are all lower than the primary standard of GB8979-1996. The flotation concentrate containing 32.42% of mercury and 83.25% of lead, is of high recycling value.

关 键 词：废水 硫化沉淀浮选法 铅离子 汞离子 资源回收利用 

分 类 号：X703[环境科学与工程—环境工程]