| 摘要 |
A process for producing pig iron from iron ore concentrate, at which in a reactor vessel iron ore concentrate, coal, oxygen gas and slag formers are injected beneath the surface of a molten iron bath. According to the invention, the ratio CO2/CO in the waste gas (11) from the reactor (2) is caused to increase to a value higher than corresponding to the condition of equilibrium at atmospheric pressure. Hereby a greater heat development is caused to take place in the bath for a certain coal amount. The injected amount of coal in relation to injected amount of concentrate is predetermined to be sufficient for finally reducing pre-reduced iron ore concentrate (4) in the reactor (2). According to the invention, CO and H2 in the waste gas is passed to a pre-reduction step (1), where unreduced iron ore concentrate is pre-reduced and thereafter can be injected into the reactor. …<??>According to a preferred embodiment, the reactor (2) is pressurized to cause the CO2/CO ratio to increase. |
