7TH EUROPEAN COKE AND IRONMAKING CONGRESS - ECIC 2016

The actual situation of cycle and enrichment for potassium in the BF was simulated, in order to complete the adsorption of sinters on potassium (K) vapor, the method of vapor adsorption was chosen to conduct sample preparation test in a horizontal tube furnace. With the increase of the enrichment times of K, enrichment rate of K increased and the absorption capacity of sinter on K vapor decreased. To determine the effect of the K on the reduction of sinters, the mass loss due to oxygen removal was continuously recorded, from which reduction curves were obtained. The K was found to promote the sinter reduction, but the effect of promotion declined and even played a converse function with the increase of K content. The apparent activation energy (E) value of sinter 1#-4# was 70.993, 47.881, 51.175 and 61.063 kJ/mol, respectively. The fitting results and compare of the microstructure showed the kinetic behavior was controlled almost by interfacial chemical reaction in the whole reduction process. Microstructure analysis of different sinters with different reduction degree showed the K made the micro holes of sinter edge more during the reduction process, which appeared to improve the reduction condition.