Recovery of Mercury from Spent Fluorescent Lamps via Oxidative Leaching and Cementation

Coskun S., Civelekoglu G.

WATER AIR AND SOIL POLLUTION, cilt.226, sa.6, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 226 Sayı: 6
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1007/s11270-015-2391-9
  • Dergi Adı: WATER AIR AND SOIL POLLUTION
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Cementation, Hazardous waste, Mercury recovery, Oxidative leaching, Spent fluorescent lamps, WASTE-WATER, ZINC, ALUMINUM, REMOVAL
  • Akdeniz Üniversitesi Adresli: Hayır

Özet

In this work, the recovery of mercury from spent fluorescent lamps by oxidative leaching followed by cementation process was studied. Two different reactive solutions (NaOCl/NaCl and KI/I-2) during oxidative leaching were investigated whereas at the cementation process, metallic powders of iron (Fe), copper (Cu), and zinc (Zn) were used as reducing agents to capture mercury in solid phase. Mercury could be transferred to the solution with an efficiency of 96 % from the spent lamp samples through the NaOCl/NaCl reagent. The optimal leaching conditions were determined as 2-h contact time, 120 rpm agitation speed, pH 7.5, and 50 degrees C of temperature. The reducing agent, Zn, provided 99 % of the cementation. The optimal process conditions were observed to be as 5-min contact time, pH 1, and 5 g L-1 of reducing agent concentration. This combined approach appears to be technically effective for the recovery of mercury from spent fluorescent lamps.