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Taferner, Bernd
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article
Long-Term Reoxidation of Hot Briquetted Iron in Various Prepared Climatic Conditions
Abstract
The application of hot briquetted iron (HBI) in the electric arc furnace (EAF) is a promising method to obtain high-quality steel products with a guaranteed purity level. However, during the long-term transportation and storage, the HBI will be partially reoxidized, resulting in a loss of metallization degree. Herein, long-term reoxidation behaviors of commercial HBI under various prepared climatic conditions are investigated. The results show that HBI exposed to ambient air conditions develops nearly no reoxidation. However, interval and cyclic wetting and drying of HBI lead to the worst metallization loss problem, which must be avoided. Based on morphological analysis, the reoxidation is supposed to occur at the surface and then spread into the center area through cracks or pellet boundaries. The reoxidation gradually decreases the porosity of HBI by the closure of cracks and pores with rust but shows little influence on its physical strength.