1991 Volume 77 Issue 12 Pages 2123-2130
Transport rate of gaseous phosphorus into solid iron under a reducing atmosphere was observed by a weighing method, to obtain fundamental data to discuss transport mechanism of phosphorus into reduced iron in a blast furnace.
A kind of killed and rolled steel sheet and non worked electrolytic iron sheet were used. Partial pressures of phosphorus vapor were controlled by using equilibrium relation between Ca3 (PO4)2, SiO2, C, CaSiO3 and CO. Phosphorus partial pressure and temperature were every one order between 4×10-6 and 4×10-2 atm, and every 50°C between 900 and 1050°C, respectively.
Experimental results are as follows:
1. The transport rate obeyed a parabolic rate law.
2. Relations between the rate constant of the parabolic rate law, κ, phosphorus partial pressure, PP2, and temperature, T, are as follows:
In the case of killed steel, logk=0.14 logPP2+5.68-15.6×103/T
In the case of electrolytic iron, logk= 0.14 logPP2+4.94-15.6×103/T
3. Reaction product on the surface of the solid iron was Fe2P.
