Modeling of the Consequences of Lead Particle Deformation into Plates during Lead Oxidation under Surface Mechanical Action

Abstract

We investigated the effects of mechanical factors on the oxidation of lead in organic phases containing both molecular iodine and hydrogen peroxide, as well as in phases where hydrogen peroxide was the sole oxidizing agent. The study used single lead plates with varying weight and physical surface area, as well as sets of multiple plates with approximately equal total weight. Simulations assessed the potential outcomes of transforming bulk lead particles into thin plates during oxidation. The findings showed that, under the selected conditions, single plates were consumed according to zero-order macrokinetics, with reaction rates increasing as plate weight decreased and physical surface area increased. A similar trend was observed in sets of lead plates: as the number of plates increased, while maintaining a constant total weight, the process efficiency declined. Each set exhibited a distinct type of macrokinetics curve for lead consumption, ranging from auto-accelerated progression transitioning to a stationary or wave-like regime to auto-decelerated progression leading to a slow, near-zero-order stationary regime. Therefore, the transformation of bulk lead particles into thin plates during the process inherently slowed down the reaction, a limitation that could not be mitigated through external intervention.