title: Combined oxidative leaching and electrowinning process for mercury recovery from spent fluorescent lamps.
abstract: 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.
authors.affiliation: Department of Environmental Engineering, Suleyman Demirel University, TR32260 Isparta, Turkey.
authors.forename: Cihan
authors.initials: C
authors.lastname: Ozgur
authors.affiliation: Egirdir Vocational School, Suleyman Demirel University, TR32500 Egirdir, Isparta, Turkey. Electronic address: sezencoskun@sdu.edu.tr.
authors.forename: Sezen
authors.initials: S
authors.lastname: Coskun
authors.affiliation: Mineral-Metal Recovery and Recycling Research Group, Mineral Processing Division, Department of Mining Engineering, Suleyman Demirel University, TR32260 Isparta, Turkey.
authors.forename: Ata
authors.initials: A
authors.lastname: Akcil
authors.affiliation: Department of Environmental Engineering, Suleyman Demirel University, TR32260 Isparta, Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Beyhan
authors.affiliation: Department of Electrical and Electronic Engineering, Suleyman Demirel University, TR32260 Isparta, Turkey.
authors.forename: Ismail Serkan
authors.initials: IS
authors.lastname: Üncü
authors.affiliation: Department of Environmental Engineering, Suleyman Demirel University, TR32260 Isparta, Turkey.
authors.forename: Gokhan
authors.initials: G
authors.lastname: Civelekoglu
mesh_terms: D055664:Electrochemical Techniques / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D008029:Lighting / Q000295:instrumentation*; D008628:Mercury / Q000302:isolation & purification*; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D059027:Recycling / Q000379:methods*; D012965:Sodium Chloride / Q000737:chemistry
chemical_list: D012965:Sodium Chloride; D008628:Mercury
keywords: E-waste; Electrowinning; Leaching; Mercury recovery; Spent fluorescent lamps