DIRECT STEEL MAKING METHOD USING VERTICAL FURNACE

摘要

PURPOSE:To efficiently prevent the cluster rings generated in a process for producing reduced iron and to improve the stability of operation by coating the surface of the raw material iron ore to be charged into a vertical furnace with a carbon material. CONSTITUTION:A retort 1 is parted to two stages. Coal C is thrown into a lower part and pellets P, etc. of raw material iron ore are packed into the upper part. The retort 1 is put into an electric furnace 2, etc. and is heated to about 500 deg.C. The coal C is carbonized and the generated tar-contg. gas is brought into contact with the pellet P packed layer so that the tar-base carbon material is stuck onto the pellets P. The coating rate of the carbon material is adjusted to about 0.5-4wt% by the weight of the raw material iron ore. Clustering is prevented as far as possible and the reduction temp. is increased by using such carbon material-coated raw material iron ore. The reduction rate is thus increased and the heat loss of the reducing gas is decreased.