Abstract
Jarosite residue is a typical hazardous waste produced in the zinc hydrometallurgy industry. In this study, both iron and lead were recovered from jarosite residues through the use of hydrothermal treatment with NaCl as a mineralizer. By controlling crystal site replacement, phase transformation, and lead species, Na+ was able to replace Pb2+ sites, resulting in the release of Pb2+ from Na-Pb jarosite and its transformation into Na-jarosite. During hydrothermal treatment, Na-jarosite was then easily converted into Fe2O3. Furthermore, the high concentration of Cl− captured the released Pb2+ to form soluble lead chloride complexes, which separated and remained in the liquid phase, leading to the successful separation of lead and iron. Crystallization through evaporation allowed recovery of lead as PbCl2. The separation efficiency of lead in jarosite residues was up to 92.6%, making this research a significant contribution to the effective recovery of iron and lead from jarosite residues.
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