Zinc powder preparation from zinc dross

Abstract

Direct electro winning of zinc containing waste under anodic material may be useful in electrowinning of zinc powder. The present invention deals with the electrolytic zinc powder preparation from zinc dross in sodium zincate solution. The zinc dross was first expose to SEM-XRD for micrographic study and then subjected for wet chemical analysis. It was observed that most of the zinc is in metallic state with few amount of zinc is associated with iron. Different parameters such as current density, current efficiency, voltage and concentration of electrolyte have been studied to establish the process. It was observed that at 5 amp/dm(2) current density the formation of zinc powder is possible with 1.23 kWh per kg of energy consumption. The corresponding impressed voltage was found 1.2 V and with a current efficiency of 90 %. Copyright (C) 2022 Elsevier Ltd. All rights reserved.