Semicoke for protection of blast furnace and use method thereof

A blast furnace protection and semi-coke technology, which is applied in the coking and ironmaking fields, can solve the problems of not mentioning the titanium content and the effect of furnace protection, and achieve the effect of reducing the production cost of ironmaking

Inactive Publication Date: 2016-01-06
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Utilize semi-coke as pulverized coal for blast furnace injection technology, (see Chinese patent "a kind of mixed fuel for blast furnace injection" patent application number CN102408931A, "blast furnace injection material" patent application number CN102827624A, etc.), the patent only mentions It refers to the injection of semi-coke into the blast furnace, but does not mention the addition of materials containing titanium and other components, which has no effect on protecting the furnace.

Method used

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  • Semicoke for protection of blast furnace and use method thereof
  • Semicoke for protection of blast furnace and use method thereof
  • Semicoke for protection of blast furnace and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1.1 Raw material composition and weight ratio of semi-coke

[0019] Raw material composition wt% of table 1 semi-coke

[0020]

[0021] The vanadium-titanium concentrate powder is 2.0%, the coal powder is 96.0%, and the high-aluminum, silicon carbide, and silicon nitride materials are 2.0%. The specific ratio is shown in Table 1. Put the three into Mix in an intensive mixer for 10 minutes, put the evenly mixed materials into the carbonization furnace, and start heating. When the heating temperature reaches 730°C, keep the temperature constant for 5 hours, and finally obtain semi-coke for blast furnace protection.

[0022] 1.2 Semi-focus performance

[0023] Table 2 semi-focus performance

[0024]

[0025] 1.3 How to use semi-focus

[0026] Table 3 semi-coke (with other pulverized coal ratio) scheme wt%

[0027]

[0028] Semi-coke is stored separately in the raw coal bunker, and put into the main belt for conveying pulverized coal through the coal feeder, an...

Embodiment 2

[0033] 2.1 Raw material composition and weight ratio of semi-coke

[0034] Raw material composition wt% of table 5 semi-coke

[0035]

[0036] The vanadium-titanium concentrate powder is 10.0%, the coal powder is 84.0%, and the high-aluminum, silicon carbide, and silicon nitride materials are 6.0%. The specific ratio is shown in Table 5. Put the three into Mix in an intensive mixer for 20 minutes, put the evenly mixed materials into the carbonization furnace, and start heating. When the heating temperature reaches 760°C, keep the temperature constant for 4 hours, and finally obtain semi-coke for blast furnace protection.

[0037] 2.2 Semi-focus performance

[0038] Table 6 semi-focus performance

[0039]

[0040] 2.3 How to use semi-focus

[0041] Table 7 semi-coke (with other pulverized coal ratio) scheme wt%

[0042]

[0043] The semi-coke is stored separately in the raw coal bunker, put into the main belt for conveying coal powder through the coal feeder, and o...

Embodiment 3

[0048] 3.1 Raw material composition and weight ratio of semi-coke

[0049] Raw material composition wt% of table 9 semi-coke

[0050]

[0051]

[0052] The vanadium-titanium concentrate powder is 15.0%, the coal powder is 80.0%, and the high-aluminum, silicon carbide, and silicon nitride materials are 5.0%. The specific ratio is shown in Table 9. Put the three into Mix in an intensive mixer for 30 minutes, put the evenly mixed materials into the carbonization furnace, and start heating. When the heating temperature reaches 790°C, keep the temperature constant for 3 hours, and finally obtain semi-coke for blast furnace protection.

[0053] 3.2 Semi-focus performance

[0054] Table 10 semi-focus performance

[0055]

[0056] 3.3 How to use semi-focus

[0057] Table 11 semi-coke (with other pulverized coal ratio) scheme wt%

[0058]

[0059] The semi-coke is stored separately in the raw coal bunker, and put into the main belt for conveying pulverized coal through ...

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Abstract

The invention discloses semicoke for protection of a blast furnace and a use method of the semicoke. The semicoke is composed of, by weight, 2.0%-30.0% of vanadium and titanium materials, 2.0%-10.0% of high-aluminum, silicon carbide and silicon nitride materials and 60.0%-96.0% of coal dust. The semicoke is independently stored in a raw coal bin and is thrown into a main belt for conveying the coal dust through a coal feeder to be mixed with the other coal dust, the semicoke accounts for 5.0%-30.0%, the other coal dust accounts for 70.0%-95.0%, the mixture is fed into a medium-speed mill to be pulverized, and the prepared mixing coal dust for injection with the granularity smaller than 0.071 mm accounts for more than 60% of all the coal dust. The semicoke is used for protecting the furnace and taken as a carrier, the high-aluminum material and other materials are brought into the key portions such as the lower portion of a furnace shaft, a furnace belly and a furnace bosh in the mode of mixing of the semicoke and the injection coal dust, the protection function of the furnace protection materials on the furnace shaft is played to the maximum extent, and while the furnace protection function is achieved, the iron making production cost can be reduced effectively.

Description

technical field [0001] The invention belongs to the technical field of coking and ironmaking in the iron and steel industry, and particularly relates to a method for producing semi-coke for blast furnace protection by using inferior coal powder, materials containing vanadium and titanium components, and materials containing high aluminum, silicon nitride and silicon carbide components . Background technique [0002] Today, blast furnaces are showing two trends of large-scale and increased smelting intensity, but it also exposes the problem of furnace body maintenance. How to prolong the service life of a generation of furnaces, especially the service life of hearth and other parts has become a metallurgical task. one of the main directions of research. At present, in order to prolong the service life of blast furnaces, many advanced equipment and processes that are popular at home and abroad have been adopted at home and abroad. The composite masonry technology of micropor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
Inventor 张立国张伟王再义车玉满郭天永孙鹏
Owner ANGANG STEEL CO LTD
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