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 C1 with a Ca(OH)(2) solution (pH 12.5) may reduce C1 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 (CaCb) with Ca(OH)(2) (or CaO) during incineration at 1100 K. (c) 2006 Elsevier B.V. All rights reserved.