新型脱汞试剂对铅锌冶炼制酸废水中汞的影响
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摘要
为了实现高效率、低成本地提取铅锌冶炼烟气制酸废水中的汞,通过分析污酸中汞形态研究,开发了新型脱汞试剂,采用单因素试验方法在反应温度为25℃、反应时间25 min、脱汞剂/汞质量比为0.78、搅拌速率150 rpm/min的基础条件下研究了搅拌桨结构、不同原料浓度对反应的影响。实验结果表明:开发的脱汞剂选择性好、效率高、汞脱除率大于99.5%;渣含汞较高,为65.61%,处理后液汞浓度降至0.03 mg/L以下,实现达标排放;与硫化-沉淀法相比,该方法具有工艺流程短、操作简单等特点,并且该工艺对汞溶液的适应性广。
In order to extract mercury from acid-making wastewater from lead-zinc smelting flue gas with high efficiency and low cost. In this paper, the speciation of mercury in waste acid was studied. A new mercury removal reagent was developed. The single factor test method was used under the basic conditions of 25 ℃, 25 min reaction time, 0.78 mass ratio of mercury removal agent to mercury and 150 rpm/min stirring rate. The effects of impeller structure and different feed concentration on the reaction were studied. The experimental results show that: the developed mercury removal agent has good selectivity, high efficiency and mercury removal rate over 99.5%. The content of mercury in the slag is 65.61%. After treatment, the concentration of mercury in the liquid is reduced to less than 0.03 mg/L to achieve the discharge standard. Compared with sulfide-precipitation method, this method has the advantages of short process flow and simple operation, and the process has wide adaptability to mercury solution.
In order to extract mercury from acid-making wastewater from lead-zinc smelting flue gas with high efficiency and low cost. In this paper, the speciation of mercury in waste acid was studied. A new mercury removal reagent was developed. The single factor test method was used under the basic conditions of 25 ℃, 25 min reaction time, 0.78 mass ratio of mercury removal agent to mercury and 150 rpm/min stirring rate. The effects of impeller structure and different feed concentration on the reaction were studied. The experimental results show that: the developed mercury removal agent has good selectivity, high efficiency and mercury removal rate over 99.5%. The content of mercury in the slag is 65.61%. After treatment, the concentration of mercury in the liquid is reduced to less than 0.03 mg/L to achieve the discharge standard. Compared with sulfide-precipitation method, this method has the advantages of short process flow and simple operation, and the process has wide adaptability to mercury solution.
引文
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[8] Kadivelu K ,Kavipriya M ,Karthika C .Mercury ( II ) adsorption by activatedcarbon made from sago waste [J].Carbon,2004,42(04):745-752.
[2] 吴秀英,吴农忠,赵宏远,等.硫化钠处理含汞废水[J].中国环境科学,1995(02):128-130.
[3] 朱又春,林建民,林美强,等.电池厂含汞废水的微电解处理[J].环境保护,1999(03):12-13//16.
[4] Ritter J A,Bibler J P.Removal of mercury from waste water:large-scale performance of an ion exchange process [J].Water Science and Technology,1992,25(03):165-172.
[5] Becker N S C,Eldridge R J.Selective recovery of mercury (n) from industrialwastewaters.I.Use of a chelating ion exchanger regenerated with brine [J].Reactive Polymers,1993,21(01-02):5-1466.
[6] Monteagudo J M,Duran A,Carmona M S,et al.Elimination of inorganicmercury from waste waters using crandallite-type compounds [J].Journal of Chemical Technology and Biotechnology,2003,78(04):399-405.
[7] Ku Y,Wu M H,Shen Y S.Mercury removal from aqueous solutions by zinccementation [J].Waste Management,2002,22(07):721-726.
[8] Kadivelu K ,Kavipriya M ,Karthika C .Mercury ( II ) adsorption by activatedcarbon made from sago waste [J].Carbon,2004,42(04):745-752.