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Direct steel making process for iron ore

A direct, process technology, applied in the direction of furnace, furnace type, fluidized bed furnace, etc., can solve the problem of no progress and achieve the effect of high productivity and simplified production process

Inactive Publication Date: 2011-06-22
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cyclone furnace smelting reduction has only been tested in the middle and has not made any progress so far

Method used

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  • Direct steel making process for iron ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The direct steelmaking equipment of the present invention comprises: fine ore conveying bed (1), feeding device (2), slag zone oxygen lance (3), molten iron zone oxygen lance (4), gas phase zone secondary combustion oxygen lance (5) ), direct steelmaking furnace (6), direct steelmaking furnace slag outlet (7), direct steelmaking furnace taphole (8); direct steelmaking furnace (6) is a barrel furnace, including slag area and molten iron area , the longitudinal section as figure 1 shown. The direct steelmaking furnace (6) includes a refractory system, a water cooling system, waste gas treatment and waste heat recovery system.

[0042] Above the direct steelmaking furnace, there is a conveying bed equipment (1), which is connected to the continuous steelmaking furnace (4) through a feeding device (2); the slag area oxygen lance (3), the molten iron area oxygen lance (4) Insert into the slag area and the molten iron area respectively, the secondary combustion oxygen lance...

Embodiment 2

[0049] 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%, MgO5%~10%, FeO10% or less. Coal or coke powder is then also added to these mixes. The amount of coal powder or coke powder is determined by 500-1200kg / ton of iron. Then the mixed material is sprayed into the direct steelmaking furnace 6 with a screw feeder 2 . A molten iron bath with a thickness of 100-800mm is reserved in advance in the direct steelmaking furnace 6, and iron concentrate powder, coal powder and flux quickly form a liquid mixture slag layer, and direct reduction of iron oxides occurs in the slag layer.

[0050] The oxygen lance 3 in the slag area and the oxygen lance 4 in the molten iron area blow oxygen to the slag area and the molten iron are...

Embodiment 3

[0054] 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 0 3 5%~18%, MgO5%~10%, FeO10% or less. Others are with embodiment 2.

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Abstract

The invention discloses a direct steel making process for iron ore, which comprises the following steps: 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, directly reducing liquid iron oxide by carbon, and blowing oxygen to a slag area and a liquid iron area of the slag iron bath to control the oxidizing property of the molten slag and the iron bath so as to obtain molten steel of which carbon content is less than 1.3 percent. 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, realizes molten steel production with iron-containing minerals only by using one direct steel makingfurnace, 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 ironduring 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 directly producing molten steel from 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 rolling...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00
Inventor 张胜生董杰周勇
Owner LAIWU IRON & STEEL GRP
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