Metallurgical Properties of Coke and its Dissolution Loss Behavior in Hydrogen‐Rich Blast Furnaces

Two types of cokes were utilized, exhibiting substantial differences in coke reactivity index (CRI) but similar coke strength after reaction (CSR). Iron ore is blended in a ratio of 75%:7.5%:17.5%. The metallurgical properties of the blended ore and the dissolution loss behavior of the cokes are investigated in a softening‐melting‐dripping apparatus under a simulated hydrogen‐rich atmosphere. The atmosphere has a more pronounced effect on the softening and melting ranges of ore compared to CRI. Additionally, coke with a higher CRI is more beneficial for enhancing the permeability of the material column and the liquid permeability of the coke layer. The metallization rate of the droplets from high‐CRI coke is higher than that from low‐CRI coke. When compared with traditional coke, the droplets reduced from high‐CRI coke contain a higher iron content, with a notable reduction in the types and quantities of impurities. High‐CRI coke exhibits a denser pore structure and stronger dissolution loss resistance throughout the entire dissolution loss process. The interlayer spacing of coke is relatively smaller in a hydrogen‐rich atmosphere, with a higher graphitization degree and strong ash enrichment.