铜冶炼污酸二级硫化分步除铜、砷工艺研究  

A Two-Step Sulfurization for Stepwise Removal of Copper and Arsenic from Copper Smelting Waste Acid

作　　者：肖祈春[1] XIAO Qi-chun(Changsha Research Institute of Mining and Metallurgy Co Ltd,Changsha 410012,Hunan,China)

机构地区：[1]长沙矿冶研究院有限责任公司,湖南长沙410012

出　　处：《矿冶工程》2020年第6期68-70,共3页Mining and Metallurgical Engineering

基　　金：国家科技部十三五固废专项课题(2018YFC1900304)。

摘　　要：为从污酸中二级硫化分步除铜、砷,以湖南某铜冶炼企业污酸为研究对象,在硫化沉淀理论指导下,考察了氧化还原电位(ORP)、硫化剂种类对污酸中铜、砷去除效率的影响。结果表明:通过控制ORP可以优先选择性硫化沉淀铜。以H2S为硫化剂,一级ORP为245 mV,二级ORP为10 mV,硫化沉淀后污酸中铜、砷含量分别为0.03 mg/L和0.22 mg/L;而铜渣中铜、砷含量分别为3.09%和15.9%,砷渣中铜、砷含量分别为0.03%和23.90%,实现了二级硫化分步从污酸中除铜、砷。In order to remove the copper and arsenic from the waste acid step by step by using a two-step sulfurization, the waste acid from a Hunan copper smelting enterprise was taken for research. With the sulfide precipitation theory, effects of oxidation-reduction potential(ORP) and types of sulfiding agent on the removal efficiency of copper and arsenic from waste acid were investigated. Results show that by controlling ORP, copper can be selectively and preferentially precipitated by sulfurization. With H2S as the sulfiding agent, 245 mV for the first step of ORP and 10 mV for the second step of ORP, it is found that the contents of copper and arsenic in the waste acid after sulfurization and precipitation are 0.03 mg/L and 0.22 mg/L, respectively;while the copper slag contains only 3.09% of copper and 15.9% of arsenic, respectively, and arsenic slag contains 0.03% copper and 23.90% arsenic, respectively, which indicates that this two-step sulfurization process can realize the stepwise removal of copper and arsenic from the waste acid.

关 键 词：污酸 铜 砷 硫化沉淀 废水处理 二级硫化 氧化还原电位 

分 类 号：X703[环境科学与工程—环境工程]