Continuous steel making process for iron ore

Abstract

The invention discloses a continuous steel making process for iron ore, which comprises the following steps: by adopting a direct carbon reduction mode of liquid iron oxide, adding the iron ore or pre-reduced ore powder into slag iron bath in advance, dissolving the iron ore or the pre-reduced ore powder to form slag, then using carbon to quickly reduce the liquid iron oxide to obtain liquid iron, next blowing oxygen at the other end of a furnace to remove the carbon so as to obtain molten steel, namely realizing iron mineral addition and molten steel production in the same furnace. CO produced in the reduction reaction is mainly used for secondary combustion to compensate the heat required by the reduction reaction, and the waste gas is used for pre-heating and pre-reducing (the iron mineral can be pre-reduced in weak reducing atmosphere). The process makes full use of characteristic of high direct carbon reduction speed of the liquid iron oxide, has high production rate and low ton steel-carbon consumption, saves equipment and capital construction investment, fully simplifies material flow, avoids temperature loss of the liquid iron during transportation, and is easy to realize continuous production and automatic control.

Description

technical field

[0001] The invention relates to a steel production process, in particular to a process for continuously producing molten steel with iron ore. Background technique

[0002] At present, the most important iron and steel production process (long process) is to obtain molten steel from iron ore, which needs to go through four main process links: sintering (or pelletizing), coking, blast furnace ironmaking, and converter steelmaking, and there are many auxiliary process links. The reduction of more than 70% of iron ore in blast furnace ironmaking is indirect reduction, which is a gas-solid reaction, and the blast furnace is required to maintain good air permeability. Blast furnace use, that is, through the sintering (or pelletizing) process. The material handling capacity of sintering (or pelletizing) accounts for about the second place in iron and steel complexes (after ironmaking production), and the energy consumption ranks third after ironmaking and steel rol...

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