Alkaline Leaching and Concurrent Cementation of Dissolved Pb and Zn from Zinc Plant Leach Residues

Zinc plant leach residues (ZPLRs), particularly those produced using old technologies, have both economic importance as secondary raw materials and environmental impacts because they contain hazardous heavy metals that pose risks to human health the environment. Therefore, extraction recovery of these from ZPLRs has benefits. In this study, we investigated removal lead (Pb) zinc (Zn) by alkaline (NaOH) leaching concurrent cementation dissolved Pb Zn aluminum (Al) metal powder. The effects time, NaOH concentration, solid-to-liquid ratio (S/L), dosage Al powder on were investigated. efficiencies increased with increasing concentrations decreasing S/Ls. 62.2% 27.1%, respectively, when 2.5 g/50 mL (S/L) leached in a 3 M solution for 30 min. could be attributed partitioning relatively more mobile phases—water-soluble, exchangeable, carbonate phases—in ZPLRs. Around 100% less than 2% cemented pulp was added. Minerals solid residues, iron oxides minerals, found suppress extracted pulp, removed filtration, recovered via cementation.