Make production method of the pigiron raw materials, make restoring the pigiron raw materials, and the operation methodological

摘要

PROBLEM TO BE SOLVED: To obtain an agglomerate having scarcely reductively powdering and good reducibility by pre-reducing hematite ore to change magnetite powdery ore and agglomerating the powdery ore.;SOLUTION: The pre-reducing temp. of the hematite ore is desirable to 750°C. Further, when the magnetite powdery ore is agglomerated, carbon is desirable to contain. Concretely, the carbon is beforehand contained in the hematite ore and when the magnetite powdery ore is agglomerated, the carbon quantity may be increased. The obtd. agglomerate is not made to reduced powdering and has good high temp. property and good reducibility. Because in the case of executing the pre-reduction at 750°C, many fine pores are formed and the total porosity becomes high. Further, the magnetite powdery ore is agglomerated into small grains having 3-10 mm grain diameter and the agglomerate combining plural grains has the best reducibility. That is, the smaller the single grain for agglomerate is, the higher the reducibility of the agglomerate is.;COPYRIGHT: (C)2000,JPO