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<正> 在铜的火法冶金中,如何减少磁性氧化铁对冶炼过程的危害,一直是人们极为重视的问题,尽管人们对此问题作过一些研究,但涉及动力学方面的工作不多,因此,深入研究Fe_3O_4-(xFeS·yCu_2S)-FeO-SiO_2体系的反应动力学就具有特别重要的实际意义。 本文通过测定反应产生的SO_2来考察反应的进程,实验设备参见文献。 1.造渣熔剂对反应速度的影响 冰铜对磁性氧化铁的还原是按下列反应进行的:

The reduction kinetics of Fe_3O_4-(xFeS·yCu_2S)-FeO-SiO_2 system has been investigated against the slagging flux, silica granule size, mattegrade, initial magnetite content and temperature. The experimental results showed that the reaction rate increases with decreasing αFeO, matte grade and silica granule size as well as with increasing temperature. The reaction rate is controlled by the slagging reaction if the matte is saturated with Fe_3O_4, and by the reaction between S and O_2 in the melt if the matte is not saturated with Fe_3O_4. The corresponding rate equations can be expressed as: γSO_2=2.8×10~7exp(-154200/RT)W_(SiO_2)~(2/3)-α (1150-1300℃) γSO_2=3.1×10~8exp(-237900/RT)(%OFe_3O_4-b)~2(%S) (1200-1300℃) The activation energy for the reactions was found to be E_α=154.2 and E_b=237.9 kJ/mol respectively.