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A waste flue gas denitrification catalyst used as a blast furnace spray titanium protection material and its preparation method

A technology for denitrification catalyst and blast furnace protection, which is applied in the field of blast furnace protection by spraying titanium, can solve the problems of inconspicuous effect and high cost, and achieve the effect of simple and easy method, reducing coke ratio and increasing production

Active Publication Date: 2017-06-20
金康 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above scheme needs to use titanium concentrate, CDQ powder and coal powder. These materials are not only expensive to obtain, but also the whole process has no obvious environmental protection effect on resource recycling.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A waste flue gas denitrification catalyst is used as a blast furnace spray titanium protective material, which is made of the following raw materials in weight percentage: 60-65% of used vanadium-titanium series waste flue gas denitrification catalyst; 35-40% of iron fine powder.

[0039]Preparation method: crush the used vanadium-titanium waste flue gas denitrification catalyst and grind it into a fine powder with a particle size of ≤-200 mesh, grind the iron fine powder into a fine powder with a particle size of ≤-200 mesh, and mix the two fine powders obtained The blast furnace protection charge is evenly prepared.

Embodiment 2

[0041] A waste flue gas denitrification catalyst is used as a blast furnace spray titanium protective material, which is made of the following raw materials in terms of weight percentage: 60% of the used plate type waste flue gas denitrification catalyst, 40% of iron fine powder; the used plate type TiO in waste flue gas denitrification catalyst 2 The content of TFe is 85%, and the TFe of the iron fine powder is 60%.

[0042] Preparation method: The used vanadium-titanium waste flue gas plate denitrification catalyst is broken into small pieces or even powder by mechanical crushing, and then the magnetic difference between the auxiliary material and the stainless steel substrate is used in the magnetic separator through a magnetic separator. Separation is carried out in the selection machine, and the main component is TiO 2 For auxiliary materials, the obtained auxiliary materials are dried in a drying equipment at 200°C for 40 minutes and then ground into a fine powder with ...

Embodiment 3

[0044] A waste flue gas denitrification catalyst is used as a blast furnace spray titanium protective material, which is made of the following raw materials in terms of weight percentage: 65% of the used honeycomb waste flue gas denitrification catalyst, 35% of fine iron powder; TiO in Honeycomb Waste Flue Gas Denitrification Catalyst 2 The content of the iron powder is 90%, and the TFe of the iron fine powder is 62%.

[0045] Preparation method: crush the used vanadium-titanium waste flue gas honeycomb denitrification catalyst to obtain TiO as the main component 2 The auxiliary material, and then grind the auxiliary material into a fine powder with a particle size of -220 mesh, and grind the iron fine powder into a fine powder with a particle size of -220 mesh, and mix the two obtained fine powders in a mixing cylinder for 35 minutes until uniformly obtained. Blast furnace protection material.

[0046] Using vanadium-titanium waste flue gas denitrification catalyst as the r...

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Abstract

The invention provides a blast furnace titanium injection furnace protection material using a waste flue gas denitrification catalyst and a preparing method of the blast furnace titanium injection furnace protection material. A vanadium-titanium system waste flue gas denitrification catalyst is reused, the purposes of resource utilization and environmental protection are achieved, the effect of furnace protecting is obvious, and meanwhile the production cost of ton iron is reduced. The blast furnace titanium injection furnace protection material comprises, by weight percentage, 60-65% of used vanadium-titanium system waste flue gas denitrification catalyst and 35-40% of fine iron powder. The preparing method includes the steps that firstly, the used vanadium-titanium system waste flue gas denitrification catalyst is broken and ground into fine powder with the granularity smaller than or equal to -200 meshes; secondly, the fine iron powder is ground into fine powder with the granularity smaller than or equal to -200 meshes; and thirdly, two kinds of fine powder obtained in the first step and the second step are mixed evenly to be prepared into the blast furnace protection raw material. The blast furnace protection material prepared through the method serves as the raw material to enter a pulverized coal bunker when used and is sprayed into a blast furnace through a coal spraying gun of a blast furnace air opening by a blast furnace injection system.

Description

technical field [0001] The invention relates to the technical field of blast furnace spraying titanium protection, in particular to a waste flue gas denitrification catalyst used as a blast furnace titanium spraying protection material and a preparation method. Background technique [0002] With the emission reduction focus of my country's "Twelfth Five-Year Plan" and the promotion of SCR denitrification in coal-fired power plants, cement, steel and other industries, the Ministry of Environmental Protection predicts that the annual waste of vanadium-titanium flue gas denitrification catalysts will be as high as 12% in the next few years. -150,000m 3 . The expired flue gas denitration catalysts are classified as hazardous solid wastes because they contain a small amount of mercury, arsenic, and beryllium, which are leaching toxic substances. At present, the main disposal method for the non-renewable vanadium-titanium series waste flue gas denitrification catalyst is landfill...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00
Inventor 金康李实
Owner 金康
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