Dechlorination of auto shredder residues.
Dechlorination of ASR (auto shredder residual) wastes has been studied in the present work. ASR was predechlorinated with Ca(OH)(2) extraction as well as dechlorinated with Ca(OH)(2) during incineration or pyrolysis. Experimentally, pre-dechlorination of ASR via extraction of Cl with a Ca(OH)(2) solution (pH 12.5) may reduce Cl contain in the ASR by 15%. Extraction of Cl at elevated temperatures (such as 373 K), interestingly, led to a further reduction of Cl in the ASR to 33.5%. A small amount of HCl and light hydrocarbons (C(1)-C(5)) were yielded during pyrolysis of the ASR in the presence of Ca(OH)(2) at 773 K. On the contrary, 75-85% of Cl may be mineralized (CaCl(2)) with Ca(OH)(2) (or CaO) during incineration at 1100 K.
Tai
Hua-Shan
HS
Department of Safety, Health and Environmental Engineering, National Kaohsiung First University of Science and Technology, 2, Juoyue Road, Nantsu District, Kaohsiung 811, Taiwan, ROC. huashan@ccms.nkfust.edu.tw
Liu
Chia-Ming
CM
Wu
Yun-Jou
YJ
D002713:Chlorine / Q000737:chemistry*; D006358:Hot Temperature; D007220:Industrial Waste; D008670:Metals
D007220:Industrial Waste; D008670:Metals; D002713:Chlorine