Studies on the Solid-Solid Reaction between PbO and SiO₂

Abstract

Studies on the solid-solid reaction of the metallic oxides are of great importance not only for approach to the mechanism of sintering, but also in the field of extractive metallurgy for slag formation. In this paper, the reaction between solid PbO and SiO₂ was observed by means of differential thermal analysis with the aid of X-ray diffraction analysis and infrared absorption spectra. It was found that the 2PbO·SiO₂ compound appeared at the begining of the reaction, and then PbO·SiO₂ or 4PbO·SiO₂ compound was formed in accordance with the content of SiO₂ in the mixture. Moreover, the activation energy for diffusion of PbO in the silicate was determined from the relation between the temperature of heat treatment and the reaction rate calculated by applying Carter’s equation.