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 Ca
3 (PO
4)
2, SiO
2, C, CaSiO
3 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, log
k=0.14 log
PP2+5.68-15.6×10
3/
TIn the case of electrolytic iron, log
k= 0.14 log
PP2+4.94-15.6×10
3/
T3. Reaction product on the surface of the solid iron was Fe
2P.
抄録全体を表示