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Method for recycling iron-containing by-products discharged from coal-based ironmaking process, system used therefor, and direct-reduced iron agglomeration system

A by-product, reduced iron technology, applied in the direction of process efficiency improvement, furnace type, furnace, etc., can solve the problems of reduced recycling effect, increased energy consumption and manufacturing cost, etc., to achieve no decrease in permeability, prevention of losses, The effect of preventing breakage

Inactive Publication Date: 2015-11-25
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, energy consumption and manufacturing costs increase, and the effect of recycling decreases
[0009] Due to the problems mentioned above, the by-products are reused to a limited extent in the hot metal production FINEX system, and thus, most of the collected by-products are provided to cement plants that require free iron sources or are buried underground

Method used

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  • Method for recycling iron-containing by-products discharged from coal-based ironmaking process, system used therefor, and direct-reduced iron agglomeration system
  • Method for recycling iron-containing by-products discharged from coal-based ironmaking process, system used therefor, and direct-reduced iron agglomeration system
  • Method for recycling iron-containing by-products discharged from coal-based ironmaking process, system used therefor, and direct-reduced iron agglomeration system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] In Example 1, sludge and dust generated from the FINEX process for producing molten iron (Molten Iron Production FINEX Process) were passed through figure 1 The by-product agglomeration process shown in to agglomerate.

[0138] Specifically, sludge 20 having a water content of about 40 wt % and dust 30 having a water content of about 15 wt % as by-products discharged from the molten iron production FINEX process were prepared in a weight ratio of 7:3.

[0139] Half of the sludge 20 is fed to a sludge dryer (rotary kiln) 240 in which the half of the sludge 20 is heated to remove water.

[0140] Then, the heat-dried half of the sludge 20 is supplied to a by-product agglomeration device 230 which is an agitating mixer, and the other half of the sludge 20 which is not dried is directly supplied to the agitating mixer so that The undried half of sludge in sludge 20 is mixed with the dried half of sludge in sludge 20 . In addition, the dust 30 is supplied to an agitating mi...

Embodiment 2

[0146] In Example 2, the sludge and dust generated from the FINEX process of molten iron production were passed through figure 2 The by-product agglomeration process shown in to agglomerate.

[0147] The same by-products as used in Example 1 were produced according to the FINEX process for the production of molten iron.

[0148] All the sludge 20 is supplied to a sludge dryer (rotary kiln) 240, and the sludge 20 is heated in the sludge dryer 240 to remove water.

[0149] The dried sludge 20 is fed to an agglomerating device 30 which is a pelletizer, and dust 30 is also fed to the pelletizer. The by-products (sludge 20 and dust 30 ) mixed in the pelletizer had a water content of about 5 wt% based on the total weight of the by-products.

[0150] Water was supplied into the pelletizer to adjust the water content of the by-product to 8 wt%, and then, the by-product was agglomerated into pellets using the pelletizer.

[0151] Thereafter, the pellets are transferred from the pel...

Embodiment 3

[0154] Equal weights of sludge and dust produced from the FINEX process for producing molten iron and having the composition shown in Table 1 were mixed with each other for about 3 minutes using an Eirich mixer. In this way, pellets with an average particle size of 2 mm were obtained.

[0155] The pellets were dried in a box dryer at 105°C for 24 hours to sufficiently remove water from the pellets.

[0156] Thereafter, the pellets were mixed with reduced iron at a weight ratio of 2:8 to form a mixture sample, and 100 g of the mixture sample was agglomerated at 600 °C while applying a pressure of 150 MPa to the mixture sample to form a disc-shaped compact. Subsequently, the compressive strength of the disc-shaped compact (sample) was measured.

[0157] After excluding outliers, the average of 10 measurements was calculated. The average compressive strengths are shown in Table 2.

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Abstract

The present invention relates to a method for recycling by-products, produced in the form of dust or sludge from a coal-based ironmaking process and containing a large amount of valuable components, in a process of manufacturing agglomerated reduced iron and to an agglomeration system. The present invention provides a direct-reduced iron agglomeration system and a corresponding agglomeration method, the direct-reduced iron agglomeration system comprising: a fluidized reduction furnace for reducing fine iron ore into reduced iron; a reduced iron storage tank for storing the reduced iron and feeding the stored reduced iron to an agglomeration apparatus, the reduced iron storage tank being connected to the fluidized reduction furnace through a reduced iron discharge pipe; the agglomeration apparatus for agglomerating the reduced iron fed from the reduced iron storage tank; and an conveying means for conveying agglomerates of the by-products produced from the ironmaking process through a by-product feed pipeline, wherein the by-product feed pipeline feeds the agglomerates of the by-products to at least one selected from the fluidized reduction furnace, the reduced iron discharge pipe, and the reduced iron storage tank.

Description

technical field [0001] The present disclosure relates to a method for efficiently agglomerating by-products containing useful materials such as iron and discharged in the form of dust and sludge in a coal-based molten iron manufacturing process to reuse the by-products in a reduced iron agglomeration process methods and systems. [0002] Furthermore, the present disclosure relates to a method for recycling agglomerated by-products, and more particularly, to a method and system for recycling by-products in a reduced iron agglomeration process. Background technique [0003] The FINEX method, a coal-based molten iron production method, includes a fluidized reduction process for reducing fine iron ore, an agglomeration process for agglomerating the reduced fine iron ore, and a smelting furnace for agglomerating the reduced fine iron ore Smelting furnace process for melting agglomerated and reduced iron ore. A certain amount of by-products are removed from each of these process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C22B1/242
CPCC22B1/16C22B1/242Y02P10/216Y02P10/20C21B13/0033C21B13/004C22B7/02
Inventor 赵敏永金炫秀李达会李钟列尹诗景崔茂业高彰国
Owner POHANG IRON & STEEL CO LTD
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