Studies on Recovery of Valuable Metals by Leaching Lead–Zinc Smelting Waste with Sulfuric Acid

Germanium-containing residues (GCR) are a secondary resource rich in zinc (Zn) and germanium (Ge) produced the Zn pyrometallurgical process an important raw material for recovering Ge. To recycle residue by hydrometallurgy, sulfuric acid is used to leach under normal pressure. In this study, experimental conditions (leaching temperature, leaching time, liquid/solid (L/S) mass ratio initial acidity) were optimized through design make consistent with current industrial production conditions, so as maximize rate of Ge, main reasons low analyzed. The results show that optimum reaction follows: acidity 160 g·L?1, temperature 90 °C, L/S 5:1, time 60 min stirring speed 400 r·min?1. Under rates Ge 83.22% 77.29%, respectively. reason GCR was obtained atmospheric experiment, electron probe microanalysis (EPMA), scanning microscopy (SEM) energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) chemical phase analysis. mainly composed phases such zincite (ZnO), galena (PbS), wurtzite (ZnS) anglesite (PbSO4), elements Zn, lead (Pb), (Ge), oxygen (O), sulfur (S), silicon (Si), aluminum (Al) Fe. This study can provide certain reference value researchers, order large-scale recycling resources future.