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Banking method for damping down of large blast furnace

A blast furnace and large-scale technology, which is applied in the field of furnace closure of large-scale blast furnaces, can solve the problems of unreasonable metallurgical properties of raw materials, affecting furnace opening, and difficulty in opening furnace, and achieve stable furnace conditions, improve production efficiency, and improve the fluidity of iron slag. Good results

Inactive Publication Date: 2013-12-11
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its characteristic is that the sintering is only 44-50%, and the metallurgical properties of the raw materials are unreasonable, which affects the starting of the furnace and makes it difficult to start the furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 3200m 3 The furnace sealing method of the 1 ton blast furnace shutdown, the steps:

[0024] 1) 45 hours before the blast furnace shut down, add manganese ore into the blast furnace, the amount of addition is to make the Mn weight percentage content in the molten iron 0.8% as a principle;

[0025] 2) 7 hours before the wind break, add material to the furnace in the following way:

[0026] A. First load coke to the upper edge of the hearth, that is, the hearth is completely filled with coke;

[0027] B. Add the following materials and amounts into the bosh until the bosh is full: according to the effective volume of the blast furnace 10 kg / m 3 Add manganese ore, according to the blast furnace effective volume 5kg / m 3 Add limestone, according to the blast furnace effective volume 3 kg / m 3 Add serpentine, and all the rest is coke;

[0028] C. Load all the empty materials in batches in the furnace waist, and the amount of materials added in each batch is: according to ...

Embodiment 2

[0036] The furnace sealing method of 3200 ton blast furnace shutdown, its steps:

[0037] 1) 50 hours before the blast furnace shut down, add manganese ore into the blast furnace, the amount of addition is in principle to make the Mn weight percentage content in the molten iron 0.85%;

[0038] 2) 6.5 hours before the wind break, add material to the furnace in the following way:

[0039] A. First load coke to the upper edge of the hearth, that is, the hearth is completely filled with coke;

[0040] B. Add the following materials and amounts into the bosh until the bosh is full: according to the effective volume of the blast furnace 11 kg / m 3 Add manganese ore, according to the blast furnace effective volume 5.5kg / m 3 Add limestone, according to the blast furnace effective volume 3 kg / m 3 Add serpentine, and all the rest is coke;

[0041] C. Fill all empty materials in batches in the furnace waist, and the amount and amount of materials added in each batch are: according to...

Embodiment 3

[0049] The furnace sealing method of 2200 ton blast furnace shutdown, its steps:

[0050] 1) 50 hours before the blast furnace shut down, add manganese ore into the blast furnace, the amount of addition is to make the Mn weight percentage content in the molten iron 0.9% as a principle;

[0051] 2) 7 hours before the wind break, add material to the furnace in the following way:

[0052] A. First load coke to the upper edge of the hearth, that is, the hearth is completely filled with coke;

[0053] B. Add the following materials and amounts into the bosh until the bosh is full: according to the blast furnace effective volume of 10.5 kg / m 3 Add manganese ore, according to the blast furnace effective volume 5.3kg / m 3 Add limestone, according to the blast furnace effective volume 3 kg / m 3 Add serpentine, and all the rest is coke;

[0054] C. Fill all the empty materials in batches in the furnace waist, and the amount of materials added in each batch is: according to the effect...

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PUM

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Abstract

The invention relates to a banking method for damping down of a large blast furnace. The method comprises the follow steps: adding manganese ore into the blast furnace within 24-48 hours before damping down; within 5-8 hours before damping down, first, loading coke to the upper edge of the hearth, then, adding manganese ore, limestone and serpentine into the bosh and filling bosh by coke, and finally loading empty packing fully in batches to the bosh; loading normal packing and empty packing from the furnace stack to the furnace throat, and uniformly dividing the effective volume from the furnace stack to the furnace throat into a lower section, a middle section and an upper section so as to load, namely, the lower section: adding the normal packing and the empty packing in batches; the middle section: adding the normal packing and the empty packing in batches; and the upper section: fully adding the normal packing in batches; at 50-70 minutes before loading, thoroughly removing scrap iron in slag, and then, immediately damping down and banking. According to the method provided by the invention, the addition proportion of sinter is improved by adding silica and serpentine, so that not only is iron residue in the blow-on period good in mobility and is furnace practice stable, but also the time from blow-on to production capability is shortened to 3-5 days from original 15 days.

Description

technical field [0001] The invention relates to a method for sealing a blast furnace, in particular to a method for sealing a large blast furnace. Background technique [0002] In recent years, with the rapid increase of steel production capacity, the steel market has been volatile. In order to control the production capacity, the blast furnace had to be shut down for a long time. The long-term wind break generally adopts the empty material line method and the method of charging and sealing the furnace. A lot of fuel will be wasted if the furnace is shut down by an empty material line method, and a large amount of gas will be discharged to cause environmental pollution. For this reason, the blast furnace also has a method of sealing the furnace by changing the ingredients. [0003] The charge structure used in the normal production period of modern blast furnaces is generally: coke + sinter + pellet + lump ore. Among them, the iron content of sintered ore (calculated by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
CPCY02P10/20
Inventor 尹腾陆隆文舒文虎李向伟张庆喜周国钱王永磊张建鹏
Owner 武汉钢铁有限公司
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