In response to new technologies, which produce iron and steel at a low cost, Pulverised Coal Injection (PCI) into the Blast Furnace is increasingly being used to replace coke as a source of carbon. One of the important factors limiting an increase in the injection rate is the accumulation of unburnt char below the cohesive zone. Unstable operation occurs when reducing gases are restricted in their flow to the furnace shaft, or as a result of possible changesin the nature of liquid flow to the hearth. Unburnt coal char can get consumed/assimilated by the different phase present inside a blast furnace, including the metal phase, which is the focus of this study. The rate of dissolution of different coals into blast furnace hot metal has been investigated at 1500°C. Significant differences in the dissolution rates of these carbonaceous materials are observed. The presence of sulfur and carbon in the metal has the effect of significantly altering the dissolution performance. The dissolution behaviour of different coals can be quantitatively assessed by its crystal structure, which is obtained by X-ray diffraction technique.
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