Direct steel making technique by reducing iron ore with gas
A direct and process technology, applied in the field of iron ore gas reduction to directly produce molten steel, can solve problems such as no progress, and achieve the effects of saving equipment and infrastructure investment, simplifying logistics, and simple and orderly logistics
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Embodiment 1
[0039] The direct steelmaking equipment of the present invention comprises: a fine ore conveying bed (1), a feeding device (2), a reducing gas spray gun (3), a secondary combustion oxygen lance in the gas phase zone (4), a direct steelmaking furnace (5 ), direct steelmaking furnace slag outlet (6), direct steelmaking furnace steel outlet (7); direct steelmaking furnace (5) is a barrel-shaped furnace, and the longitudinal section is as figure 1 shown. The direct steelmaking furnace (5) includes a refractory system, a water cooling system, waste gas treatment and waste heat recovery system.
[0040] There is a conveying bed equipment (1) above the direct steelmaking furnace, and the conveying bed equipment (1) is connected with the direct steelmaking furnace (5) through a feeding device (2); the reducing gas spray gun (3) is inserted into the slag area, and the gas phase The secondary combustion oxygen lance (4) in the zone is inserted into the gas phase space above the direct ...
Embodiment 2
[0047] Mix iron concentrate powder with some iron-containing lump ore, limestone, and dolomite. Their ratio is determined according to the composition of the slag in the smelting process of these materials and through material balance calculation. Generally, the alkalinity of the slag is taken 1~1.5, Al 2 o 3 5%~18%, MgO 5%~10%, FeO 10% or less. Then the mixed material is loaded into the direct steelmaking furnace 5 through the screw feeder 2 . A molten iron pool with a thickness of 100-800 mm is reserved in the direct steelmaking furnace 5 in advance, and the iron concentrate powder and flux quickly form a liquid mixture slag layer. Furnace gas reduces FeO-containing slag to obtain molten steel with a carbon content of less than 1.3%.
[0048] In the upper space of the direct steelmaking furnace, the reduction reaction produces a large amount of CO, and the water-cooled oxygen lance 4 blows oxygen, and the secondary combustion of CO provides part of the heat for the reduc...
Embodiment 3
[0051] Mix the finely ground and pre-reduced iron ore powder with limestone and dolomite, and their ratio is determined according to the composition of the slag in the smelting process of these materials and through material balance calculation. Generally, the alkalinity of the slag is 1~1.5, Al 2 o 3 5%~18%, MgO 5%~10%, FeO 10% or less. Others are with embodiment 2.
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