Preparation and Application of Nano-structured Lead Dioxide from Waste Lead Slag

Abstract

To develop an efficient and green method to recycling lead slag, a novel strategy to fabricate nano-lead dioxide from lead slag was applied by the hydro-electrometallurgy. In leaching system, the optimum condition of leaching time 100 min, 80 °C, stirring rate 500 rpm, liquid/solid ratio 20 and 1 mol/L methanesulfonic acid resulted in lead recovery of 89% and residue obtained without toxicity. The kinetic study revealed that the methanesulfonic acid leaching of lead slag shows good agreement with a diffusion-controlled shrinking-particle model. Additionally, the apparent activation energy of MSA leaching of lead slag was determined using Arrhenius model as 13.621 kJ/mol. Furthermore, Nano-PbO2 recovered from waste lead paste was prepared for the electrolysis of water to produce ozone. The experimental results showed that the ozone production of nano-PbO2 recovered from waste lead slag was not significantly different from the nano-PbO2 prepared by pure reagents. In conclusion, waste lead slag can be recycled for the fabrication of nano-PbO2, which has a significant advantage on realizing the recycling of lead resources.