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.
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