Effect of Hydrogen Addition on Low Temperature Metallurgical Property of Sinter

Abstract

Hydrogen-enrich iron making process is certainly to be an effective method to reduce greenhouse gases emission. However, the effect of hydrogen addition on the low temperature metallurgical property of sinter is still unclear. A detailed investigation was performed on the above topic. The results are as follows. When CO is partially replaced by H₂, the RDI_〈3.25 (RDI_〈28) of sinter decreases with the increase of the H₂ content; when the content of H₂ increases, the CO, CO₂ and N₂ decrease proportionally, in this case, RDI_〈3.15 (RDI_〈2.8) of sinter increases with the increase of H₂ content; the value of RDI_〈3.15 (RDI_〈2.8) basically depends on the reduction index (Ri). The experimental data of RDI_〈2.8 based on Japanese industrial standard (JIS) are a little higher than the data of RDI_〈3.15 based on Chinese industrial standard (CIS) in the same condition. In addition, for part of CO is replaced by H₂: RDI_〈2.8=3.383 94 + 1. 1585 RDI_〈3.15; for other gases, except H₂, are decreased proportionally: RDI_〈2.8 = 17.396 78 + 0.429 22 RDI_〈3.15.