新型缓释硫化药剂处理铅锌冶炼酸性废水实验研究  

Treatment of acidic effluent from lead-zinc smelting with a new sustained-release sulfidizing agent

作　　者：何劲松 蒋晓云 班双 易亚男 HE Jin-song;JIANG Xiao-yun;BAN Shuang;YI Ya-nan

机构地区：[1]长沙华时捷环保科技发展股份有限公司,湖南长沙410013

出　　处：《中国有色冶金》2021年第4期19-23,共5页China Nonferrous Metallurgy

摘　　要：针对目前石灰中和法和硫化法及其组合工艺处理铅锌冶炼过程中产出的含重金属污酸废水存在的问题,本文提出了采取缓释硫化处理工艺与分段中和相结合的方法,并采用新型缓释硫化药剂进行了铅锌冶炼污酸废水的净化除重试验,得出以下结论:在缓释硫化药剂投加量为理论需求量的2倍、溶液酸度60 g/L、硫化反应时间40 min、常温常压、搅拌速度300 r/min的条件下,污酸废水中重金属离子As、Tl、Cd脱除率达到99%以上,Hg的脱除率达到90%以上;该试验中和后液出水达到《铅锌工业污染物排放标准》(GB 25466—2010)中排放限值要求,产出的石膏渣达到资源化利用水平。In view of the issues existing in the treatment of acidic heavy metal-bearing effluent produced in the process of lead-zinc smelting by lime neutralization,sulfidization process and their combined processes,the method combining sustained-release sulfidization process with staged neutralization is proposed in this paper,and a new sustained-release sulfidizing agent is used to carry out the purification and heavy metal removal test of acidic effluent from lead-zinc smelting,and the following conclusions are drawn:under the conditions that the dosage of sustainedrelease sulfidizing agent is twice the theoretical demand,the solution acidity is 60 g/L,the sulfidization reaction time is 40 min,and the stirring speed is 300 r/min,as well as under normal temperature and pressure,the removal rate of heavy metal ions As,Tl,Cd in the acidic effluent can reach more than 99%and Hg removal rate is above 90%.The solution resulting from neutralization meets the discharge limit requirements in the Emission Standard of Pollutants for Lead,Zinc Industry(GB 25466—2010),and the produced gypsum residue reaches the level of recycling.

关 键 词：缓释硫化药剂 酸性含重废水 石灰中和法 硫化法 重金属脱除率 石膏渣 

分 类 号：TF813[冶金工程—有色金属冶金] X758[环境科学与工程—环境工程]