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The iron and steel making industry is responsible for around 14% of the CO2 gas emissions in Japan, with the contribution from the ironmaking process being particularly large. However, it is essential to utilize fossil fuel energy, especially coal, in the conventional ironmaking process, because carbon is required for heat generation, reduction of iron oxide and carburization. Ironmaking processes based on large scale blast furnaces have been well-established and are characterized by efficient energy consumption. Therefore, further drastic decrease in the CO2 emissions seems to be difficult. The use of H2 as a reducing agent in blast furnaces may be a potential solution to overcome this problem. To realize it, a constant and secure source of H2 and a better understanding of the H2 effects on the blast furnace operation are required. A potential source of H2 in a steel plant could be the coke oven gas (COG). However, the reduction of iron oxide by H2 is an endothermic reaction; thus, an increase in H2 would lead to a significant change in the distribution of the temperature in the blast furnace.1) Moreover, a change in the permeability of the blast furnace is expected, due to a change in the reduction disintegration behavior of the Reduction and Disintegration Behavior of Sinter under N2–CO– CO2–H2–H2O Gas at 773 K

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Reduction and Disintegration Behavior of Sinter under N&lt;sub&gt;2&lt;/sub&gt;–CO–CO&lt;sub&gt;2&lt;/sub&gt;–H&lt;sub&gt;2&lt;/sub&gt;–H&lt;sub&gt;2&lt;/sub&gt;O Gas at 773 K