Study and Improvement of Reduction Retardation and Melt-down Properties of Pellets

Abstract

The reduction, carburization, and melt-down properties at high temperatures of pellets and sinter in packed beds were studied using a quenching method. The results obtained are summarized as follows: (1) Reduction retardation of pellets is attributed to the disappearance of the micropores caused by sintering of iron under the presence of a liquid exuded from the wustite core. (2) Carburization proceeds mainly through the diffusion of carbon from the iron surface, brought about by melting reduction, directly contacting solid carbon. (3) Improved pellet reduction retardation was brought about by adjusting the chemical composition of the core part to have a higher solidus temperature. The melt-down property was ameliorated by increasing the basicity of the entire pellet. © 1990, The Iron and Steel Institute of Japan. All rights reserved.