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Iron-containing material slag bath smelting reduction steelmaking technical method and device

A slag bath and material technology, applied in the field of steel production technology, can solve the problems of high cost, unreasonable use of process energy, and low efficiency.

Inactive Publication Date: 2012-05-23
莱芜美澳冶金科技有限公司
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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
At present, the long-process blast furnace ironmaking adopts belt roaster, or grate rotary kiln and other equipment to sinter the high-temperature oxidized pellets at 1100 ° C to 1250 ° C. It needs to go through the cooling process. After cooling to room temperature, it is added to the blast furnace. The loss of heat energy is huge, and the process energy Unreasonable use

Method used

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  • Iron-containing material slag bath smelting reduction steelmaking technical method and device
  • Iron-containing material slag bath smelting reduction steelmaking technical method and device
  • Iron-containing material slag bath smelting reduction steelmaking technical method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Iron-containing materials: iron ore powder; carbon-containing materials: coal powder, sulfur and phosphorus are as low as possible, and the fixed carbon content is generally above 77%; pellet sintering equipment: grate rotary kiln.

[0061] The continuous steelmaking equipment of the present invention includes: chain grate rotary kiln (pellet sintering equipment) 1, slag bath furnace 9, oxidation furnace 22, and gas reforming furnace 36. The slag bath furnace 9 and oxidation furnace 22 pass through the B-shaped overflow The iron port 18 is connected, the grate rotary kiln (pellet sintering equipment) 1 is connected to the slag bath furnace 9 through the high temperature feeding system, and the gas reforming furnace 36 is connected to the slag bath furnace gas outlet 8 and oxidation furnace gas through the high temperature gas pipeline 32 The output port 21 is connected; the upper part of the slag bath furnace 9 is provided with a slag bath furnace cover 10, a combustion lan...

Embodiment 2

[0068] Iron-containing materials: iron ore powder; carbon-containing materials: coal powder, sulfur and phosphorus as low as possible, generally fixed carbon content above 77%; pellet sintering equipment: belt roaster. In this embodiment, the combustion gun 11 is not used, and high-quality high-temperature gas can be obtained. Others are the same as in Example 1.

Embodiment 3

[0070] Iron-containing materials: 70% iron ore powder, 30% iron-containing metallurgical dust; carbon-containing materials: coal powder, sulfur and phosphorus as low as possible, generally fixed carbon content above 77%; pellet sintering equipment: belt roaster.

[0071] Iron-containing metallurgical dust composition: iron oxide scale, blast furnace dust ash, converter dust ash, electric furnace dust ash, sintered pellet dust ash, etc.

[0072] 70% of the iron ore powder and 30% of the iron-containing metallurgical dust are sintered by the pellet sintering equipment and then added to the slag bath furnace together with the flux. Quicklime, dolomite, and fluorite are added to the slag bath slag surface at a weight ratio of 10:9:1 and 140 kilograms of molten iron per ton. The slag alkalinity of the slag bath furnace is controlled at 1.26-1.28; the burner 11 and the slag bath furnace The side wall forms an angle of 50 degrees, the gas oxygen lance 12 and the side wall of the slag bath...

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Abstract

The invention relates to slag bath smelting reduction continuous steelmaking technology for iron-containing material pelletized sintering equipment. In the technology, after a thick-slag layer molten bath is formed in a slag bath furnace, combined injection of carbon-containing materials, combustible gas, oxygen or oxygen-enriched air is implemented on the top and at the bottom of the molten slag, the carbon-containing materials or the combustible gas is combusted to form high-temperature molten slag, and residual carbon or combustible gas keeps the reducibility of the molten slag; the iron-containing materials are sintered into high-temperature oxidized pellets through pelletized sintering equipment and are added into the slag bath furnace through a high-temperature loading system to be molten and reduced; and molten steel continuously flows into an oxidation furnace without slag through a beta-shaped tap hole, a fluxing agent is added into the oxidation furnace for slagging desulfuration and dephosphorization, tamping oxygen and inserted oxygen lance blowing oxygen adjusts the C content and temperature of the molten steel so as to obtain the molten steel for direct supply to LF or RH refining furnaces. The slag bath smelting reduction continuous steelmaking technology has the advantages of high production efficiency, high thermal efficiency, long service life of the furnace,short flow, easy continuity and automatic control of production, equipment and capital investment conservation, land conservation, energy conservation and emission reduction.

Description

Technical field [0001] The invention relates to a steel production process, in particular to a process method and a device for producing molten steel by smelting reduction of iron-containing material slag bath, and belongs to the technical field of iron and steel metallurgy. Background technique [0002] my country's steel production has been the world's largest for 9 consecutive years, and currently leads the world with a production capacity of more than 700 million tons. However, the ensuing pressure on energy, resources, and emissions is huge. As the international community pays more and more attention to environmental protection, iron ore, scrap steel, coke and other resources are in short supply, and coking coal resources are particularly prominent. People are constantly looking for an iron or steelmaking method that does not use coking coal, such as pellet sintering equipment, Itmk3" The third-generation ironmaking method" Kobe Steel of Japan and Midrex of the United States...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00C21C7/064
Inventor 董涛董亚飞周生献
Owner 莱芜美澳冶金科技有限公司