Selective recovery of lead from galena-sphalerite by electro-oxidation

Add time:08/03/2019    Source:sciencedirect.com

It is difficult to selectively obtain the qualified lead and zinc from the galena-sphalerite ore by using the existing pyrometallurgical process. A novel method by using electro-oxidation in Fe ion solution has been identified which facilitates the selective separation of lead from the galena-sphalerite concentrate. Fe was used as the leaching catalyst. The leaching process of galena and sphalerite has been systematically investigated. Adding galena-sphalerite to the solution, over 89.2% lead extraction has been demonstrated with <2.1% zinc dissolution. This was achieved by the application of a suitable condition with H+ concentration = 0.5 mol/L using HCl, NaCl concentration = 3 mol/L, FeCl2 concentration = 0.4 mol/L, S/L ratio = 0.03 g/mL, anodic current density = 989 A/m2, applied potential = 2.6 V–3.2 V, initial Fe3+/Fe2+ ratio = 0, stirring speed = 700 rpm, 63 °C and 45 min to a concentrate slurry. It was confirmed that sulfur (S) was found to be the major existing forms of S from galena-sphalerite. Furthermore, the anodic reaction was investigated by linear sweep voltammetry. The selective leaching and separation mechanism of lead and zinc was initially formed.

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