Effect of the addition amount of iron carbon agglomerates on the isothermal reduction kinetics of pellets–iron carbon agglomerates mixture

Abstract

The effect of iron carbon agglomerates (ICA) on the reduction of pellet (or sinter) is very important to the smelting efficiency of BF. In this paper, the effect of addition amount of ICA on the reduction of pellets and the isothermal reduction reaction kinetics of pellets-ICA mixture were comprehensively studied. The results show that the addition of ICA among pellets can significantly improve the reduction degree of pellets. There is a synergistic effect between ICA and pellets. All the pellets-ICA mixtures have the same reaction control mechanism: stage 1 is the secondary order chemical reaction F2, and stage 2 is the phase boundary reaction R2 of shrinking core model. As the amount of ICA increases from 15 to 35%, the activation energy of pellets-ICA mixture at stage 1 decreases from 95.53 to 75.21 kJ/mol, and the activation energy at stage 2 increases from 98.18 to 138.34 kJ/mol.