Influence of Metallurgical Dust on Ferro‐Coke Reactivity and Gasification Mechanism

Ferro‐coke is an emerging ironmaking fuel that can reduce both blast furnace fuel consumption and CO ₂ emissions. This study investigates the effect of metallurgical dust on the gasification behavior of ferro‐coke and elucidates its catalytic mechanism. Results indicate that the addition of dust decreases the initial gasification temperature of ferro‐coke, with a further decline observed as the dust dosage increases. When the dust addition amount increases from 0 to 20%, the initial gasification temperature decreases from 808.8°C to 729.5°C. The rate‐limiting step of the ferro‐coke gasification reaction shifts from chemical reaction control to internal pore diffusion control. Scanning electron microscopy‐energy dispersive X‐ray spectroscopy (SEM‐EDS) characterization demonstrates that dust increases the internal porosity of ferro‐coke, consistent with the random pore model. Meanwhile, X‐ray diffraction (XRD) and Raman spectroscopy analyses show that dust decreases the degree of carbon graphitization, increases the amorphous carbon content, and enhances gasification reactivity. First‐principles calculations confirm the synergistic catalytic effects of Fe and Ca in the dust; the reaction energy barrier is reduced from 196.65 kJ·mol ⁻¹ to 115.26 kJ·mol ⁻¹ , indicating a pronounced catalytic effect.