Cascade sulfidation and separation of copper and arsenic from acidic wastewater via gas-liquid reaction  

污酸废水中铜和砷的气-液梯级硫化与分离（英文）

作　　者：Guo-min JIANG Bing PENG Li-yuan CHAI Qing-wei WANG Mei-qing SHI Yun-yan WANG Hui LIU 蒋国民;彭兵;柴立元;王庆伟;史美清;王云燕;刘恢(中南大学冶金与环境学院,长沙410083;长沙赛恩斯环保科技有限公司,长沙410000;中南大学国家重金属污染防治工程技术研究中心,长沙410083)

机构地区：[1]School of Metallurgy and Environment, Central South University, Changsha 410083, China [2]Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution,Changsha 410083, China [3]Changsha Science Environmental Technology Co., Ltd., Changsha 410000, China

出　　处：《Transactions of Nonferrous Metals Society of China》2017年第4期925-931,共7页中国有色金属学报（英文版）

基　　金：Projects(51304251,51504299)supported by the National Natural Science Foundation of China;Project(201509050);supported by Special Program on Environmental Protection for Public Welfare,China;Project(k1502037-31)supported by Key Project of Changsha,China

摘　　要：Copper and arsenic in acidic wastewater were separated by cascade sulfidation followed by replacement of arsenic in theprecipitates by copper in the solution which was realized by recycling precipitates obtained in the first stage into the initial solution.The effects of reaction time,temperature and H2S dosage on copper and arsenic removal efficiencies as well as the effects of solid-toliquidratio,time and temperature on the replacement of arsenic by copper were investigated.With20mmol/L H2S at50°C within0.5min,more than80%copper and nearly20%arsenic were precipitated.The separation efficiencies of copper and arsenic werehigher than99%by the replacement reaction between arsenic and copper ions when solid-to-liquid ratio was more than10%at20°Cwithin10min.CuS was the main phases in precipitate in which copper content was63.38%in mass fraction.通过气-液硫化反应初步分离污酸废水中的铜和砷,并将一级铜、砷分离渣按一定比例加入污酸原液中实现溶液中铜和渣中砷的置换分离。考察反应时间、温度和H2S用量对铜、砷去除率的影响,同时考察固液比、时间和温度对铜、砷置换反应的影响。当在50℃时加入20mmol/L的H2S时,在0.5min时间内即可使铜的去除率达到80%以上,且砷的去除率约为20%。将铜、砷一级分离渣按照10%以上的固液比例加入污酸废水中,在20℃下10min后由于铜、砷置换作用,废酸中铜和砷分离率达到99%以上。沉渣中主要物相为CuS,富集的铜渣中铜的质量分数为63.38%。

关 键 词：acidic wastewater COPPER ARSENIC cascade sulfidation SEPARATION 

分 类 号：X703[环境科学与工程—环境工程]