Production of Carbon Included Sinter and Evaluation of Its Reactivity in a Blast Furnace Environment

Abstract

Recently, the reduction in the amount of the CO₂ emission has become an important issue. It is important to increase the reactivity of iron sources used in a blast furnace to decrease of CO₂ emission. Therefore, the carbon composite iron ore agglomerates are significant. The production experiments of a new agglomerate named CIS (Carbon Included Sinter), where green balls were granulated by a model pan pelletizer were carried out using pot tests. The reduction of produced CIS with CO–CO₂ gas mixture were examined, and were compared with that of ordinary sinter ore. Also, the softening and melting property tests of 50% CIS–50% sinter mixed layer were carried out and compared with the results using 100% sinter layer. The results are summarized as follows:
(1) A new agglomerate, which an anthracite particle was surrounded by a shell with the same components as ordinary sinter ore, was produced by sintering pot test.
(2) When CIS was reduced by CO–CO₂ gas mixture at 1273 K, the degree of reduction achieved 80% in 120 min, even though ordinary sinter ore achieved less degree of reduction.
(3) 250 g CIS–250 g ordinary sinter ore packed bed achieved 1/3 maximum pressure drop of 500 g ordinary sinter ore packed bed in the softening-melting property test.