環境・リサイクル

[2401-09-01] Recycling of Fine Pyrolyzed Char from Shredder Residue using Mineral Processing Techniques

○Ade Hidayat¹, Gjergj Dodbiba¹, Yuuki Nagase², Kennichi Sakurai², Kazumi Otabe³, Josianne Ponou¹, Toyohisa Fujita¹ (1. The University of Tokyo, 2. Tokyo Tekko Co., Ltd., 3. Econergy Co., Ltd.)

司会：西須 佳宏（国立研究開発法人産業技術総合研究所）

Keywords:Shredder Residue, Recycling, Char, Froth Flotation, Magnetic Separation

Fine char (-1 mm) produced from the pyrolysis of shredder residue is a potential source of fuel due to its carbonaceous content (22%). However, the ash constituent in the char is quite high and recycling at this stage is not very common. In this study, mineral processing techniques, which includes size reduction, magnetic separation, and froth flotation were employed to recover carbonaceous and other valuable materials from the char. The recycling flow started from the separation of -100um char by sieving with a looped feed from the ball mill, followed by magnetic separation, froth flotation, and CO₂ bubbling. This process was intended to improve flotation efficiency, remove ferrous material, ash and chlorine content respectively. The increase of carbonaceous content up to 36% at 90% recovery can be achieved in the final concentrate of froth flotation using 0.5 L/t MIBC frother and 3 kg/t kerosene collector dosage.