|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||PbZn 2020: The 9th International Symposium on Lead and Zinc Processing
||Development of the New Zinc-separation Process for the Blast Furnace Dust
||Mariko Shinoda, Toyoshi Yamaguchi, Ryota Murai, Goro Okuyama, Ikuhiro Sumi
|On-Site Speaker (Planned)
Blast furnace dust has been recycled as iron source in sintering process. However, dust-recycling rate is limited due to the zinc in dust. Thus, it is necessary to remove zinc from dust. In this study, laboratory-scale experiments were conducted and we propose new hydrometallurgical process. This process is composed of acid leaching, leachate-purification and zinc-recovery. By acid leaching, 68 wt% of zinc was selectively leached under the pH value of 2.0, while only 6.4 wt% of iron was leached. Leachate-purification is the key process. The iron leached by acid leaching was completely separated from leachate under the pH value of 5.0, added with hydrogen peroxide. Zinc was finally recovered as zinc hydroxide at alkali condition such as the pH value of 9.0. Zinc concentration in the sludge was concentrated to 42.6 wt%. Thus, dust can be potentially used as zinc source as well as iron source.