本文以含高Al(Al76％,Si18.9％,Fe5.1％)的Al-Si-Fe合金为还原剂,在不同温度下进行热法还原Mg实验,测定了Mg的蒸气压为lgp_(Mg)=-8853/T+10.58.与用Si-Fe还原剂相比,在相同的p_(Mg)下,还原温度可下降约200℃。 用Bonnier法和本实验所测定的数据计算了Al-Si-Fe合金在不同温度下各组元的活度。结果表明,三元系中各组元活度均有负偏差,尤其Fe的偏差很大。另外,由以上所得的活度数据还计算了还原反应的平衡常数和热焓,分别为: lgK_[Al]=-18.40×10~4/T+117.2,ΔH=3529.5KJ
The vapour pressure of Mg, P_(Mg), over their thermal reduction of Mg withreducing agent, a high Al alloy containing Si 18.9% and Fe 5.1%, at varioustemperatures was measured by the transportation method as:lg P_(Mg)=-8853/T+10.58As compared with ferrosilicon as reducing agent, the reduction temperature maybe reduced about 200℃ at the same P_(Mg). The activity of each component inAl-Si-Fe alloy at various temperatures was calculated using the data measured byboth Bonnier method and this study. The activities of all components in theternary system have negative deviations, especially, very high for Fe. Based onthe above-mentioned data of the activities, the equilibrium constant and enthalpyof the reduction were also calculated as follows:lg K_[Al]=-18.4×10~4/T+117.2△H=3529.5 kJ
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