【一般講演】湿式素材プロセッシング / 高温素材プロセッシング　［9/4(木) AM 　第５会場］

[3501-07-01] Glycine-based stepwise leaching strategy for selective dissolution of Pb, Cu, and Zn from seafloor hydrothermal ore

○Gowthaman SIVAKUMAR Sivakumar¹, Rishni Masimbula¹, Naoko Okibe¹ (1. Kyushu University)

司会：畑田 直行（京都大学）

キーワード：seafloor hydrothermal ore, glycine, copper and zinc, lead, selective metal leaching

This study investigates the potential applicability of a glycine (Gly)-based stepwise leaching strategy for the selective dissolution of lead (Pb), copper (Cu), and zinc (Zn) from seafloor hydrothermal ore. Glycine, a non-toxic and biodegradable amino acid, was used as the leaching agent, and a series of shaking flask experiments were conducted under both alkaline and acidic conditions to evaluate individual leaching behaviors. Under alkaline conditions, Pb was completely dissolved within one hour when H₂O₂ was added to the Gly system, indicating its potential use as a pre-treatment step for selective Pb removal. Following this, acidic Gly leaching was examined for Cu and Zn extraction. In the acidic Gly system, leaching efficiencies of 50% for Cu and 65% for Zn were achieved. The addition of NaCl enhanced Cu dissolution, while its effect on Zn remained minimal. Instead, the addition of H₂O₂ in the acidic Gly system promoted almost complete dissolution of both Cu and Zn due to oxidative enhancement. These preliminary results suggest that Gly-based stepwise leaching may offer a feasible approach for improving metal separation in the hydrothermal ore processing. Further studies are underway to validate the sequential leaching performance.