Comprehensive recycling of zinc and iron from smelting waste containing zinc ferrite by oriented transformation with SO2. (1st August 2020)

• Record Type: Journal Article
• Authors: Li, Yan-Chun; Zhuo, Shen-Nan; Peng, Bing; Min, Xiao-Bo; Liu, Hui; Ke, Yong
• Is Part Of: Journal of cleaner production. Volume 263(2020)
• Publication Date: 2020-08-01
• Subjects: Zinc leaching residue -- EAFD -- SO2 transformation -- Zinc and iron recycling; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2020.121468
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: The comprehensive recycling of zinc and iron from smelting waste containing zinc ferrite (SWCZF) remains a challenge. A study is to be the first proposed that hazardous SWCZF is directionally converted with SO2 for simultaneous recycling of zinc and iron. In the first step, zinc and iron phases in SWCZF were transformed into zinc sulfate and ferric oxide via oriented transformation with SO2 . The decomposition rate of zinc ferrite and the yield of zinc sulfate were 94% and 95%, respectively. In the second step, zinc and iron in SWCZF were directionally enriched to obtain zinc sulfate solution and iron concentrate via water leaching-magnetic separation. The leaching rate of zinc from water leaching was 93.2% and the iron recovery from magnetic separation was 83.8%. The zinc sulfate solution can be directly returned to the traditional hydrometallurgical process to produce electrolytic zinc or be used to produce zinc sulfate with no generation of iron residues. The iron concentrate can be used as a raw material for iron making. Meanwhile, a clean slag was produced and can be safe for storage or potentially used as construction materials. Therefore, the deep reclamation, reducing quantity and harmlessness of SWCZF were realized via this cleaner technical route. Graphical abstract: Image 1 Highlights: Zinc and iron phases in SWCZF were converted into zinc sulfate and ferric oxide via orientated transformation with SO2 . Zinc from SWCZF has selectively leached to obtain zinc sulfate solution by water leaching. Iron from SWCZF has directionally enriched to obtain iron concentrate. A clean slag has obtained.