Production of carbon included sinter and evaluation of its reactivity in a blast furnace environment

Abstract

Recently, the reduction in the amount of the C02 emission has become an important issue. It is important to increase the reactivity of iron sources used in a blast furnace to decrease of C02 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-C02 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-C02 gas mixture at 1 273 K, the degree of reduction achieved 80% in 120 min, even though ordinary sinter ore achieved less degree of reduction. (3)250 g CIS-250g 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. © 2009 ISIJ.