Leaching Behavior and Immobilization of Heavy Metals in Zinc Leach Residue Before and After Thermal Treatment

Demir G., Çoruh S., Ergun O. N.

ENVIRONMENTAL PROGRESS, cilt.27, sa.4, ss.479-486, 2008 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 27 Sayı: 4
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1002/ep.10302
  • Dergi Adı: ENVIRONMENTAL PROGRESS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED)
  • Sayfa Sayıları: ss.479-486
  • Anahtar Kelimeler: zinc leach residue, zinc, lead, thermal treatment, metal leachability, MICROSTRUCTURAL CHARACTERIZATION, FLY-ASH, INDUSTRIAL, WASTE, VITRIFICATION, EXTRACTION, RECOVERY, TESTS, GLASS
  • Ondokuz Mayıs Üniversitesi Adresli: Evet

Özet

The aim of the present study was to investigate the metal leaching behavior of the hazardous waste of zinc industry before and after thermal treatment. Samples were subjected to the TCIP (Toxicity Characteristic Leaching Procedure) and ASTM (American Society of Testing and Materials) methods. The results of TCLP and ASTM leaching methods demonstrate that addition of clinoptilolite, blast furnace slag, and red mud to the zinc leach residue reduces the heavy metal content in the effluent and the red mud performs better than clinoptilolite and blast furnace slag. Tbe leaching tests showed that the content of some elements in the waste before thermal treatment exceeded the regulatory limits and cannot be disposed of in the present form. Metal releases decreased at higher temperatures from 600 degrees C and 800 degrees C and reached to minimum levels at 1200 degrees C because of heat-induced formation qf a glassy matrix. The levels of Zn2+ released for 1200 degrees C was 0.025 mmol/L. Therefore, a stabilization or inertization treatment is necessary prior to disposal. Thermal treatment can be an acceptable method for disposal of zinc leach residue. (C) 2008 American Institute of Chemical Engineer Environ Prog, 27: 479-486, 2008