Blast Furnace Burdens Behaviour of Materials during Softening and Melting

Abstract

In order to get the reasonable sinter basicity and suitable burden structures in Ansteel, the metallurgical performance of sinter, the softening-melting properties with different burdens were studied systematically in laboratory. The results show that, the reducibility and the reduction disintegration are improved, and the mineral compositions of the sinter become reasonable with the basicity increasing. When the basicity reaches 1.95-2.15, the burden structures with single sinter will achieve good softening-melting performance, and the maximum pressure maintains at a low level. When the sinter collocates with pellet and the basicity reaches 1.90-2.15, there will be narrow softening and melting zones and a low S property value. With the addition of natural lump ore, the softening zone will be widened and the melting zone will be narrowed, but burden’s comprehensive performance will be bettered. The assessment indexes obtained for the interactive reaction between burdens can assess the reasonableness of burden structure. Considering the reactivity index and the economic cost, the reasonable proportion of lump ores in blast furnace needs to be controlled within 15%-20%.