SiO ガスを媒介とする溶鉄中への珪素の移動

概要

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Chemical transport reaction of silicon from a sintered silicon carbide disc to Fe-C melt by SiO gas medium at 1450 to 1600℃ was investigated in the view of kinetics. The results were interpreted by a mass transport equation derived from the mixed control theory, topochemical reaction theory and unreacted core model. Numerical values of all coefficients included in the equation were experimentally determined as follows. [numerical formula] k^<(1)>_f=3.47×10^<14>exp (-131, 000/RT)(cm/sec) k^<(2)>_f=4.14×10^<11>exp (-84, 900/RT)(cm^2/sec) D^G_<Sio>=6.49×10^<-11>(T)^<3.31>(cm^2/sec) D^C_<Sio>=0.346D^G_<Sio>(cm^2/sec) The most important factor for the silicon transfer by gaseous medium was found to be an activity of carbon in Fe-C melt. Therefore, the possibility of gaseous silicon absorption into freely falling liquid iron droplets in a blast furnace was concluded to depend upon the carbon content in droplets. The derived general equation is expected to be applicable to other conditions. than experimentally undertaken.
社団法人日本鉄鋼協会の論文
1969-10-01