Ozgur Cihan, Coskun Sezen, Akcil Ata, Beyhan Mehmet, Üncü Ismail Serkan, Civelekoglu Gokhan
Department of Environmental Engineering, Suleyman Demirel University, TR32260 Isparta, Turkey.
Egirdir Vocational School, Suleyman Demirel University, TR32500 Egirdir, Isparta, Turkey.
Waste Manag. 2016 Nov;57:215-219. doi: 10.1016/j.wasman.2016.03.039. Epub 2016 Mar 31.
In this paper, oxidative leaching and electrowinnig processes were performed to recovery of mercury from spent tubular fluorescent lamps. Hypochlorite was found to be effectively used for the leaching of mercury to the solution. Mercury could be leached with an efficiency of 96% using 0.5M/0.2M NaOCl/NaCl reagents at 50°C and pH 7.5 for 2-h. Electrowinning process was conducted on the filtered leaching solutions and over the 81% of mercury was recovered at the graphite electrode using citric acid as a reducing agent. The optimal process conditions were observed as a 6A current intensity, 30g/L of reducing agent concentration, 120min. electrolysis time and pH of 7 at the room temperature. It was found that current intensity and citric acid amount had positive effect for mercury reduction. Recovery of mercury in its elemental form was confirmed by SEM/EDX. Oxidative leaching with NaOCl/NaCl reagent was followed by electrowinning process can be effectively used for the recovery of mercury from spent fluorescent lamps.
本文采用氧化浸出和电解沉积工艺从废旧直管荧光灯中回收汞。发现次氯酸盐可有效地将汞浸出到溶液中。在50°C和pH 7.5条件下，使用0.5M/0.2M的NaOCl/NaCl试剂2小时，汞的浸出效率可达96%。对过滤后的浸出液进行电解沉积，以柠檬酸作为还原剂，在石墨电极上汞的回收率超过81%。最佳工艺条件为电流强度6A、还原剂浓度30g/L、电解时间120分钟、室温下pH为7。发现电流强度和柠檬酸用量对汞的还原有积极影响。通过扫描电子显微镜/能谱仪（SEM/EDX）确认了汞以元素形式回收。用NaOCl/NaCl试剂进行氧化浸出后再进行电解沉积工艺可有效地从废旧荧光灯中回收汞。
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