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Process and device for dual continuous steel making with iron-containing material rotary hearth furnace

A rotary hearth furnace and material technology, applied in the field of iron and steel metallurgy, can solve the problems of high cost and low efficiency

Active Publication Date: 2010-04-21
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN87104957.0 Slot furnace continuous steelmaking process and equipment, a continuous steelmaking process with a forehearth, a trough furnace and a rear furnace, the raw material used is still blast furnace molten iron, with low efficiency and high cost

Method used

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  • Process and device for dual continuous steel making with iron-containing material rotary hearth furnace
  • Process and device for dual continuous steel making with iron-containing material rotary hearth furnace
  • Process and device for dual continuous steel making with iron-containing material rotary hearth furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Iron-containing materials: iron ore fine powder, carbon-containing materials: coal powder.

[0064] The continuous steelmaking equipment of the present invention includes: a smelting furnace 9 and an oxygen blowing furnace 21, the smelting furnace 9 and the oxygen blowing furnace 21 are connected through the siphon outlet 18 of the smelting furnace; 9 The upper part is equipped with a gas-oxygen combustion gun 11, a coal-oxygen gun 12, and an argon gun 13. The lower part of the melting furnace is equipped with a slag outlet 14 of the melting furnace, a steel opening 15 at the bottom of the melting furnace, a water-cooled furnace wall 16 of the melting furnace, and a refractory material furnace of the melting furnace. Wall 17, melting furnace cover 19; melting furnace siphon tapping outlet 18, melting furnace siphon tapping outlet water cooling wall 19, melting furnace siphon tapping outlet refractory wall 20, melting furnace bottom oxygen blowing bricks 32 and 33; The o...

Embodiment 2

[0072] Iron-containing materials: iron ore powder 50%, iron-containing metallurgical dust 50%, carbon-containing materials: coal powder.

[0073] Iron-containing metallurgical dust composition: iron oxide scale, blast furnace dust, converter dust, electric furnace dust, sintering pellet dust, etc.

[0074] 50% of iron ore powder and 50% of iron-containing metallurgical dust are pre-reduced in a rotary hearth furnace and fed into the smelting furnace together with limestone and dolomite flux. The coal oxygen lance 12 on the side wall of the smelting furnace forms an included angle of 30 degrees with the horizontal plane of the slag layer, such as figure 1 and 3 The α angle shown; at the same time, it forms an angle of 0 degrees with the diameter of the melting furnace, and inserts into the slag in the middle layer of the slag zone, as shown figure 2 β angle shown. The high-temperature pre-reduced iron-containing material in the discharge bin 3 of the rotary hearth furnace o...

Embodiment 3

[0076] Iron-containing materials: 100% iron-containing metallurgical dust, carbon-containing materials: one or more of coke oven gas, blast furnace gas, natural gas, and produced gas.

[0077] What the slag coal oxygen lance (12) injects is: one or more of coke oven gas, blast furnace gas, natural gas, and generated coal gas. The coal oxygen lance 12 on the side wall of the smelting furnace forms an included angle of 45 degrees with the horizontal plane of the slag layer, such as figure 1 and 3 The α angle shown; at the same time, it forms an included angle of 30 degrees with the diameter of the melting furnace, and is inserted into the slag in the middle layer of the slag zone, such as figure 2 Shown β angle, others are the same as embodiment 1.

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Abstract

The invention relates to a process for dually continuously producing molten steel by using an iron-containing material rotary hearth furnace, which comprises the following steps: forming a molten pool in a smelting furnace in advance, and blowing a carbon-containing material and oxygen to form foam slag; reducing the iron-containing material to form an iron-containing material of which metallization rate is 90 to 97 percent and temperature is between 900 and 1,200 DEG C through the rotary hearth furnace, and feeding the iron-containing material into the smelting furnace through a high-temperature feeding system to be smelted and reduced; blowing high-temperature oxygen or oxygen-enriched air to combust with CO produced by the smelting furnace; continuously pouring the molten steel into an oxygen blowing furnace through a siphon port, adding a little amount of fusing agent into the oxygen blowing furnace to perform slagging, desulfuration and dephosphorization, and blowing oxygen by using a plug-in oxygen gun to further adjust the content of C in the molten steel and the temperature so as to obtain the molten steel directly supplied to an LF or RH refining furnace. The process has the advantages of high production rate, high thermal efficiency and long furnace service life, implements direct production of the molten steel from ores or iron-containing materials by using continuous steel making equipment consisting of the rotary hearth furnace, the smelting furnace and the oxygen blowing furnace, saves equipment and capital construction investment, saves the land, simplifies material flow, and is easy for serialization and automatic control of the production.

Description

technical field [0001] The invention relates to a continuous production process of steel, in particular to a process for continuously producing molten steel in double-connected rotary hearth furnaces with iron-containing materials, belonging to the technical field of iron and steel metallurgy. Background technique [0002] With the rapid development of the world's iron and steel industry and the increasing emphasis on environmental protection in the international community, the shortage of iron ore, scrap steel, coke and other resources, especially coking coal resources, people are constantly looking for an iron or steelmaking method that does not use coking coal. A method of reusing the iron-containing dust produced by sintering, ironmaking, converter steelmaking, electric furnace steelmaking, etc., the rotary hearth furnace came into being. After more than 30 years of development, the rotary hearth furnace has become more and more perfect. The main process method is the IN...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/14
Inventor 董杰李丰功曾晖王学斌
Owner LAIWU IRON & STEEL GRP
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