Blast furnace pellet capable of being used for treating invalid SCR denitration catalyst and preparation method of blast furnace pellet

Abstract

The invention discloses a blast furnace pellet capable of being used for treating an invalid SCR denitration catalyst and a preparation method of the blast furnace pellet, and belongs to the technical field of pellet preparation. The pellet comprises catalyst powder and a low-melting-point material; the catalyst powder contains titanium oxide, the content of the titanium oxide is not less than 65%, and heating treatment is carried out on the catalyst powder; the low-melting-point material is prepared by mixing and heating blockages in the spent catalyst and an iron-containing material, and the mass content of FeO in the iron-containing material is not less than 35% of the total amount of the iron-containing material; and heating and modifying are carried out on the titanium oxide-containing catalyst powder in the pellet, in combination with the low-melting-point material formed by mixing and heating the blockages and the iron-containing material, the influence of unfavorable phase change in the pellet roasting process is effectively avoided, and meanwhile, volume reduction, harmlessness and resourceful treatment and utilization of the invalid SCR catalyst are realized.

Description

technical field [0001] The invention relates to the technical field of blast furnace pellet preparation, in particular to a blast furnace pellet that can be used to treat spent SCR denitration catalysts. Background technique [0002] At present, pellets are one of the important iron-making raw materials in the blast furnace smelting process. Its output is relatively large, and the pellet preparation process has great potential for solid waste consumption. At present, nitrogen oxides (NOx) are one of the most important pollutants in industrial flue gas, and NH 3 -SCR denitrification is widely used due to its stability and high efficiency. NH 3 - The core technology of the SCR method lies in the development of catalysts. At present, the most used denitration catalyst in the world is V 2 o 5 -WO 3 / TiO 2 catalyst. Due to the complex denitration conditions, the catalyst will be deactivated during use due to sintering, blockage, chemical poisoning, etc., and thus become ha...

AI Technical Summary

Problems solved by technology

In addition, TiO 2 It belongs to the non-reactive phase during the pellet roasting process, and inclusion in the pellets will affect the grain morphology of the pellet recrystallization process, hinder the grain growth, and eventually cause the strength of the pellets to deteriorate after roasting

[0007] will currently fail V 2 o 5 -WO 3 / TiO 2 The use of catalysts in the production of blast furnace pellets is rare, and according to experimental experience, the invalid catalyst cannot be simply mixed into the pelletizing raw materials to produce titanium-containing pellets. It is necessary to fully consider the impact of the addition of invalid catalysts. Through theoretical analysis and practice Combining with the above, using appropriate raw material modification treatment methods to dispose of spent catalysts in a way that is harmless, recyclable and does not have a major impact on the quality of pellets, so as to produce a blast furnace with controllable composition and stable structure Furnace protection pellets to realize effective utilization of spent catalysts

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