Abstract
The reduction process in blast furnace involves the higher cost of a steel company. The operational stability of the reduction process should be accompanied by low fuel rate and a good productivity. Thus, it is extremely important to control the main parameters of this process as the ratio between the direct and indirect reduction, the efficiency of the stack, the temperature of the Thermal Reserve Zone and energy balance of the Elaboration Zone. This analysis was performed using the Rist diagram, to assess the operational changes of operation All Coke in relation to the use of pulverized coal injection in a blast furnace 1 at ArcelorMittal Tubarao. The Rist diagram was effective in to relate the parameters studied with these operational changes.
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