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分析了石墨和磁铁矿的机械活化能,并就其对碳气化反应及磁铁矿碳热还原反应热力学的影响进行了理论探讨。研究结果表明,石墨或磁铁矿的储能均可使磁铁矿碳热还原温度降低。磁铁矿的储能对还原热力学的影响方式是直接的,而石墨的储能对还原热力学的影响是间接的:石墨储能导致气化反应平衡常数增大,从而间接影响磁铁矿的碳热还原热力学。另外,磁铁矿的两个还原反应1/4Fe3O4+CO3/4Fe+CO2和Fe3O4+CO3FeO+CO2的转折温度随磁铁矿储能的增加而线性下降,但不受石墨储能的影响。
The mechanical activation energies of graphite and magnetite were analyzed. The effects of carbonation on the carbonization reaction and the thermodynamics of carbothermal reduction of magnetite were discussed theoretically. The results show that the energy storage of graphite or magnetite can reduce the carbon thermal reduction temperature of magnetite. The impact of storage of magnetite on reduction thermodynamics is direct, and the effect of graphite storage energy on reduction thermodynamics is indirect: the storage of graphite leads to an increase of equilibrium constant of gasification reaction, which indirectly affects the magnetite carbon Thermal reduction thermodynamics. In addition, the transition temperatures of the two reduction reactions 1 / 4Fe3O4 + CO3 / 4Fe + CO2 and Fe3O4 + CO3FeO + CO2 for magnetite decrease linearly with increasing magnetite energy storage, but not Affected by graphite energy storage.