低能量雷射與水熱處理回收電弧爐集塵灰之有價金屬及製備觸媒應用性研究

Recovery of Valuable Metal and Catalysts Materials from Electric Arc Furnace Dust by Low Energy Fiber Laser and Hydrothermal Treatment

蔡正國(C.K. Tsai) ； 葉志奕(C.Y. Yeh) ； 張世穎(S.Y. Chang) ； 洪肇嘉(J.J. Horng)

《鑛冶：中國鑛冶工程學會會刊》 66卷2期 (2022/06) Pp. 40-55

https://doi.org/10.30069/MM.202206_66(2).03

摘要

電弧爐集塵灰（EAFD）由冶金過程生產生大量固體廢棄物越來越受關注，故將其有效再利用回收有價值鐵、鋅等金屬以減少對環境危害為首要當務之急。本研究成功以光纖雷射術回收技術，可將廢棄電弧爐集塵灰（EAFD）轉化有價金屬鐵、高純度氧化鋅粉，其在較低雷射功率600W與低掃描速率2 mm/s條件，更可同時回收高純度粒狀鐵與粗氧化鋅粉末分別為84.1%與85.9%，其透過XRD結構鑑定分別為Fe_3O_4與ZnO晶相結構具有再利用價值。此外，亦利用水熱處理成功將EAFD置備Fe_3O_4/ZnO觸媒材料，並證實此觸媒材料以在可見光－芬頓反應在30分鐘內即可將水中高濃度（200 mg L^(-1)）亞甲基藍汙染100%去除，並分解成二氧化碳、水或其他無害化小分子有機物，故本研究證實電弧爐集塵灰利用光纖雷射技術回收技術可同時回收粒狀鐵與粗氧化鋅粉有價金屬外，亦可製備高效率Fe_3O_4/ZnO光觸媒複合材料，且具快速降解水中有機汙染物效能，故能有效提升電弧爐集塵灰再利用價值。

關鍵字

光纖雷射 ； 電弧爐集塵灰 ； 有價金屬錠 ； 複合Fe_3O_4-ZnO觸媒

並列摘要

Electric arc furnace dust (EAFD) has attracted more and more attention as a kind of metallurgical solid waste with colossal production. Therefore, developing a novel recycling technology to reduce its harm to the environment and efficiently recover valuable metals such as zinc and iron is urgently needed. This study successfully developed optical fiber laser recovery technology to produce helpful metal iron, high-purity zinc oxide powder from waste electric arc furnace dust collection (EAFD). The optima condition used at a lower laser power of 600 W and low scanning rate of 2 mm/s, which can simultaneously recover 84.1% and 85.9% of high-purity granular iron and crude zinc oxide powder, respectively, which physical characteristics are identified utilization value material as Fe_3O_4 and ZnO crystal phase structures by XRD. Furthermore, a novel Fe_3O_4/ZnO catalyst composite material was also successfully developed from EAFD by hydrothermal. This catalyst material has excellent removal efficiency of 100% for removing high concentration (200 mg L^(-1)) of MB dye in the aqueous solution within 30 minutes under the visible light with a Fenton-like reaction. However, this study confirmed that the use of optical fiber laser and hydrothermal technology to recover dust from electric arc furnaces could simultaneously recover granular iron metal and zinc oxide powder as well as valuable Fe_3O_4/ZnO photocatalyst composite.

並列關鍵字

Fiber laser ； Electric arc furnace (EAF) wastes ； valuable metal ingots ； Fe_3O_4-ZnO composites catalysts

參考文獻

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