The study of isothermal reduction kinetics of Cara Mine by full hydrogen reduction

Abstract The study investigated the changes in the degree of metallization of Kara iron powder with particle sizes ranging from 0.5-1.7 mm during hydrogen reduction at different temperatures (700-1000°C) and durations (0-100 min). The effective activation energy for the hydrogen reduction of Kara iron ore was calculated using the unreacted nuclear model, and the corresponding reduction kinetics equation was established to obtain the limiting link in the reduction reaction. [1] The results indicated that as the reduction temperature is increased, the degree of reduction of the iron powder increases in accordance with the aforementioned. In the low-temperature range (700~800°C), the hydrogen reduction of iron powder was controlled by diffusion reactions, while at intermediate to high temperatures (850°C), it was governed by interfacial chemical reactions. At high temperatures (900°C), the hydrogen reduction of iron powder was again dominated by diffusion reactions, with the calculated activation energy (Ea) being 73.637 kJ/mol. [2,3,4]