Process and device for continuous steelmaking from ferriferous material

A material and process technology, applied in the field of continuous steel production process, can solve the problems of high cost and low efficiency, and achieve the effect of increasing temperature

Active Publication Date: 2009-06-03
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent 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, which has low efficiency and high cost

Method used

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  • Process and device for continuous steelmaking from ferriferous material
  • Process and device for continuous steelmaking from ferriferous material
  • Process and device for continuous steelmaking from ferriferous material

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Iron-containing materials: iron ore fine powder, carbon-containing materials: coal powder. Iron ore fine powder and flux adopt high-temperature dense-phase conveying bed and serial tank distributor.

[0056] The continuous steelmaking equipment of the present invention comprises: a high-temperature storage bin (1), a sending tank (2), a conveying pipeline (3), and a collection tank (4) connected to a suspension pre-reduction furnace for mixing iron-containing materials and flux , string tank distributor (5), melting furnace (6), gas output device (7), molten pool oxygen lance (8), CO oxygen combustion lance (9), carbonaceous material spray lance (11) melting furnace oxygen lance (12), smelting furnace slag outlet (13), smelting furnace siphon steel outlet (14), smelting furnace bottom steel opening (15); oxygen blowing furnace (16), oxygen blowing furnace oxygen lance (17), blowing Oxygen furnace carbonaceous material combustion gun (18), oxygen blowing furnace flux ad...

Embodiment 2

[0064] Iron-containing materials: iron ore fine powder 80%, iron-containing metallurgical dust 20%, carbon-containing materials: coal powder. Iron-containing materials and flux are sprayed into the furnace by spray guns.

[0065] Iron-containing metallurgical dust composition: iron oxide scale, blast furnace dust, converter dust, electric furnace dust, sintering pellet dust, etc.

[0066] Finely grind iron ore micropowder, iron oxide scale, blast furnace ash, converter ash, electric furnace ash, sinter pellet ash, limestone and dolomite into 10-40μm micropowder.

[0067] The continuous steelmaking equipment of the present invention comprises: smelting furnace (6), coal gas output device (7), molten pool oxygen lance (8), CO oxygen combustion lance (9), iron-containing material and flux spray gun (10), containing Carbon material lance (11) smelting furnace oxygen lance (12), smelting furnace slag outlet (13), smelting furnace siphon steel outlet (14), smelting furnace bottom s...

Embodiment 3

[0070] Iron-containing materials: 10%-90% iron ore fine powder, 90%-10% iron-containing metallurgical dust, carbon-containing materials: one or more of natural gas, combustible ice, coke oven gas, and produced gas. Iron-containing materials and flux are sprayed into the furnace by spray guns.

[0071] One or more of natural gas, combustible ice, coke oven gas and generated coal gas are sprayed into the slag layer carbonaceous material spray gun (11). Others are with embodiment 2.

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Abstract

The invention relates to a process for continuous steelmaking from a ferriferous material. A molten pool is formed in a steel-smelting furnace at first, and carbonic material and oxygen are insufflated to form foaming slag; the ferriferous material and a fluxing agent are added into the smelting furnace to be molten and reduced, oxygen is insufflated into the molten steel so as to reduce the carbon content in the molten steel, the temperature of the molten steel is risen, and the molten steel is stirred with the generated CO gas; high temperature oxygen or oxygen-enriched air is insufflated and burns with CO gas generated in the smelting furnace; and the molten steel continuously flows into an oxygen blowing furnace through a siphon nozzle, and a small quantity of the fluxing agent is added into the oxygen blowing furnace so that slag formation, desulfurization and dephosphorization are performed, the C content and the temperature in the molten steel are further adjusted through blowing oxygen by an insertion oxygen lance, therefore, the obtained molten steel is directly supplied for an LF refining furnace or an RH refining furnace. The invention has the advantages that the productivity equipment including a suspended pre-reduction furnace, the smelting furnace and the oxygen blowing furnace, the investment for devices and capital construction is saved, the land is saved, the physical distribution is simplified, and the continuous production and the automatic control are facilitated.

Description

technical field [0001] The invention relates to a continuous production process of steel, in particular to a process for continuously producing molten steel with iron-containing materials, which belongs to the technical field of iron and steel metallurgy. Background technique [0002] According to the technological process, steelmaking can be divided into two forms: short process and long process. The short process is to use scrap steel, direct reduced iron (DRI, sponge iron) as raw materials, melt and oxidize crude steel in an electric furnace, and refine finished steel in a refining furnace without coke. The most common use is natural gas as a reducing agent MIDREX, HYL method and coal-based rotary kiln method, shaft furnace method, rotary hearth furnace method, etc., but iron ore powder agglomeration or pelletizing process is still required, and abundant natural gas resources are needed. Coal-based rotary kiln method The production efficiency is low, and the scale of rot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00
CPCF27B3/04C21B13/0013C21C7/0087F27B3/20F27B3/22F27B3/18F27B19/04C21B13/004Y02P10/134Y02P10/20C21B13/00
Inventor 董杰李丰功王学斌王博
Owner LAIWU IRON & STEEL GRP
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