Comparative Study on the Kinetics of the Isothermal Reduction of Iron Ore Composite Pellets Using Coke, Charcoal, and Biomass as Reducing Agents

The kinetics of the isothermal reduction iron ore–coke, ore–charcoal, and ore–biomass (straw) composite pellets were studied at 900–1200 °C. Compared with other two pellets, pellet using biomass as a reducing agent showed more rapid rate relatively low temperature. With an increase in temperature, rates three different tended to be equal. reactions all mainly controlled by gasification diffusion. can described interface reaction kinetic model ([1?(1?m)1/3]2=kt). apparent activation energies diffusion coke, charcoal, °C calculated Arrhenius equation, they 95.81, 71.67, 58.69 kJ/mol, respectively. exhibited lower energy than agents.