Effect of NaCl in Surrounding Atmosphere on Oxidation Rate of HBI

This paper discusses the effect of NaCl on the secondary oxidation rate of hot-briquetted iron (HBI) during its transportation to consumers in Russia, former Soviet republics, and other foreign countries by both rail and water transport. This results in distinct atmospheric conditions surrounding the briquettes, leading to varied oxidation processes. This study is significant as the oxidation rate directly affects the metallurgical properties of the briquettes. The article presents experimental investigations on the impact of different NaCl concentrations (0–4%) in water, which evaporates into the atmosphere surrounding HBI, on its reactivity. The findings reveal that the reactivity of briquettes increases with up to 4% NaCl content in the water surrounding the HBI. Consequently, the iron oxidation rate in the briquettes also rises, with reactivity increasing from 0.234 to 0.412 nm 3 /(ton·day) and the rate from 0.0833 to 0.1459 kg/day. These results suggest that seawater, particularly with NaCl content up to 4%, significantly impacts the iron oxidation rate in HBI. Therefore, when transporting by sea, it is essential to consider this influence and implement measures to mitigate this type of oxidation.