<p>The kinetics of suspension magnetization roasting and the microstructural evolution of hematite in a 10% CO–90% CO₂ atmosphere across temperatures ranging from 500 °C to 1000 °C have been examined. The kinetics analysis revealed that the reaction follows an A3/2 model. The activation energy (Ea) was determined to be 37.03 kJ/mol, and the pre-exponential factor (A) was 41.48 min⁻¹ between 500 °C and 700 °C. At temperatures from 800 °C to 1000 °C, Ea was observed to be − 32.75&#xa0;kJ/mol, with an A value of 0.011&#xa0;min⁻¹. Microstructural examination of the products indicated that initial magnetization reduction roasting induced cracks and pores on the surfaces of hematite particles, facilitating gas transport within the particles and accelerating the magnetization reaction. However, at temperatures exceeding 800 °C, the porous structure transitioned into a denser configuration, diminishing the internal pore size of the particles and increasing resistance to gas flow. As the reaction progressed, the newly formed magnetite further enhanced resistance to heat and mass transfer, thereby decelerating the reaction rate. For optimal industrial production, magnetization roasting should be conducted within a judiciously controlled temperature range.</p>