Abstract: In view of the significance of realizing the carbothermic reduction sequence of Fe₂O₃→Fe₃O₄→Fe for ferric oxide, the thermodynamic multifactor coupling including stored energy，total pressure，partial pressure of inert gas as a new thought were put forward, and the quantitative relation satisfied by the thermodynamic parameters as an indication of multifactor coupling was deduced. Furthermore, how to decrease the stored energy for carbon on the basis of the quantitative relation for energy conservation was discussed from the view of energy saving. The results show that on the premise that the partial pressure of inert gas(or total pressure) is fixed, stored energy for carbon required for realizing the above sequence can be decreased even to zero by regulating the value of total pressure(or partial pressure of inert gas) within certain range.

Key words: Carbothermic reduction sequence for ferric oxide, Carbon gasification, Thermodynamic Multifactor coupling, Stored energy, Total pressure, Partial pressure of inert gas