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Blowing-type furnace protection charge for blast furnace and using method of blowing-type furnace protection charge

A technology for protecting furnace materials and blast furnaces, which is applied to blast furnaces, blast furnace details, blast furnace parts, etc., can solve the problems of low utilization rate of molten iron [Ti], large amount of titanium-containing materials, and inability to increase molten iron, etc., to shorten furnace protection time, The effect of improving the utilization rate and increasing the amount of precipitation

Active Publication Date: 2018-09-07
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing furnace protection methods for titanium-containing materials only increase the [Ti] content of molten iron, but cannot increase the [N] content of molten iron, resulting in low utilization of molten iron [Ti], large amounts of titanium-containing materials, and long furnace protection time

Method used

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  • Blowing-type furnace protection charge for blast furnace and using method of blowing-type furnace protection charge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Blast furnace injection protection material, chemical composition and weight percentage content: 25% of ferrosilicon nitride; 75% of titanium concentrate powder.

[0023] Among them: N=38% in ferrosilicon nitride; Fe=12%; Si=49%; TiO in titanium concentrate powder 2 = 48%. The maximum particle size of each solid raw material is ≤1.5mm.

[0024] at a certain 1200M 3 For the blast furnace, use the furnace protection material injection tank to spray the above-mentioned blast furnace injection furnace protection material into the furnace from the tuyere above the repaired part of the hearth, with a total of 85 tons, and a good repair effect is obtained.

Embodiment 2

[0026] Blast furnace injection protection material, chemical composition and weight percentage content: manganese silicon nitride 15%; ferrosilicon nitride 15%; titanium concentrate powder 70%.

[0027] Among them: N=28% in manganese silicon nitride; Mn=14%; Si=46%; N=35% in ferrosilicon nitride; Fe=15%; Si=48%; TiO in titanium concentrate powder 2 = 52%. The maximum particle size of each solid raw material is ≤1.5mm.

[0028] In a certain 2600M 3 For the blast furnace, use the furnace protection material injection tank to spray the above-mentioned blast furnace injection furnace protection material into the furnace from the tuyere above the hearth repair part, with a total of 95 tons, and a good repair effect is obtained.

Embodiment 3

[0030] Blast furnace injection protection material, the chemical composition and weight percentage content are: manganese nitride silicon 30%; titanium concentrate powder 70%.

[0031] Among them: N=30% in manganese nitride silicon; Mn=15%; Si=45%; TiO in titanium concentrate powder 2 = 49%. The maximum particle size of each solid raw material is ≤2.0mm.

[0032] In a 3200M3 blast furnace, the above-mentioned blast furnace injection furnace protection material was sprayed into the furnace from the tuyere above the hearth repair part by using the furnace protection material injection tank, with a total of 110 tons, and a good repair effect was obtained.

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Abstract

The invention relates to blowing-type furnace protection charge for a blast furnace. The blowing-type furnace protection charge for the blast furnace comprises, by weight, 20%-40% of titanium-containing materials and 60%-80% of nitrogen-containing materials, wherein the content of TiO2 in titanium-containing material powder is equal to or higher than 40%, and the nitrogen-containing materials comprise one or two of manganese and silicon nitride and ferro-silicon nitride. The titanium-containing materials comprise one or more of titanium concentrate, high-titanium slag and rutile. A using method of the blowing-type furnace protection charge for the blast furnace comprises the steps that the blowing-type furnace protection charge for the blast furnace is placed into a furnace protection charge blowing tank on a casting house platform, and every time blast-furnace casting work is completed, the blowing-type furnace protection charge for the blast furnace is blown into the blast furnace from a tuyere above a hearth repair position. According to the blowing-type furnace protection charge for the blast furnace, the content of [Ti] in molten iron can be improved, the content of [N] in themolten iron in a hearth can also be remarkably improved, so that the quantity of separated-out TiN is improved, the utilization rate of TiO2 is increased, the furnace protection effect is enhanced, and the furnace protection time is shortened.

Description

technical field [0001] The invention relates to the technical field of ironmaking production, relates to blast furnace protection technology, in particular to a blast furnace injection protection material and a method for using the same. Background technique [0002] Adding titanium-containing materials into the blast furnace is the main measure commonly used at home and abroad to prolong the life of the blast furnace hearth. In the existing furnace protection technology for titanium-containing materials, titanium-containing materials are mainly added from the top of the furnace, that is, titanium-containing materials such as titanium concentrate are mixed into pellets or sintered ore, and then loaded into the blast furnace as raw materials. In addition, there are methods such as direct injection of titanium powder from the tuyeres, feeding of high-titanium content cored wires from the tuyeres, and feeding from the iron mouth with the gun mud. But either way, the mechanism ...

Claims

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Application Information

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IPC IPC(8): C21B5/00C21B7/06
CPCC21B5/008C21B7/06
Inventor 王再义廖相巍唐复平童晓宇张伟张立国邓伟王相力
Owner ANGANG STEEL CO LTD
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