To produce molten pig iron from ferrous scrap at a low coke ratio in a specified vertical scrap melting furnace.
When ferrous scrap and coke are charged from a furnace top and air is blasted from a main tuyere and an upper tuyere, air is blasted from the main tuyere and the upper tuyere so that the position Lu/H of the upper tuyere, the blast volume ratio Vu/(Vm+Vu) at the upper tuyere, and the flow velocity Vc at the furnace center position of the blast at the upper tuyere satisfy any one of the conditions (1): Lu/H=0.25-0.80, Vu/(Vm+Vu)=0.21 to 0.37, Vc=10-25, (2): Lu/H=0.35 to 0.70, Vu/(Vm+Vu)=0.15 to 0.43, Vc=10 to 25, and (3): Lu/H=0.35 to 0.70, Vu/(Vm+Vu)=0.21 to 0.37, Vc=8 to 25, where Lu: the distance in the furnace height direction from the main tuyere to the upper tuyere, H: the distance in the furnace height direction from the main tuyere to the stock line, Vm: blast volume at the main tuyere, Vu: blast volume at the upper tuyere.
ISHIWATARI NATSUO
MURAI RYOTA
SAWA YOSHITAKA
| JPS57148175A | 1982-09-13 | |||
| JP2002003917A | 2002-01-09 | |||
| JPH10204512A | 1998-08-04 |