環境・リサイクル

[2401-09-01] 破砕残渣微細焼成チャーの選鉱技術を用いたリサイクリング

○Hidayat Ade¹、Dodbiba Gjergj¹、長瀬 優希²、櫻井 憲一²、小田部 和美³、Ponou Josianne¹、藤田 豊久¹ (1. 東京大学、2. 東京鐵鋼株式会社、3. 株式会社エコナジー)

司会：西須 佳宏（国立研究開発法人産業技術総合研究所）

キーワード：破砕残渣、リサイクリング、チャー、泡沫浮選、磁 気 分離

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.