Effects of Dust Addition on the Reactivity and High-Temperature Compressive Strength of Ferro-Coke

This study evaluated how raw-material compounding strategies affect the high-temperature compressive strength of ferro-coke. Ferro-coke was prepared using varying additions of iron-carbon-containing dust (ICD) and different gasification temperatures. High-temperature experiments were conducted to study the reactivity (CRI) and hot strength of ferro-coke, and fracture morphologies were examined by microscopy and Micro-CT. The results show that both the increase in ICD addition amount and gasification temperature would increase the reactivity and decrease the high temperature of ferro-coke. As ICD addition increased from 5% to 20%, the reactivity of the ferro-coke rose from 58.70% to 76.32%, and high-temperature strength decreased from 3260 N to 1954 N at 800 °C. This trend is attributed to catalytic components in ICD (e.g., Fe, Zn), which would accelerate gasification, increase porosity, and reduce high-temperature strength. Similarly, increasing the gasification temperature from 1000 °C to 1200 °C enhanced reactivity from 51.95% to 65.51%, but the hot strength was reduced. The higher carbon gasification rate at elevated temperature increases porosity and weakens the coke matrix, lowering compressive strength.