Treatment method for metallurgy sintering of abandoned SCR flue gas denitrification catalyst

Abstract

The invention discloses a treatment method for metallurgy sintering of an abandoned SCR flue gas denitrification catalyst. The method is characterized by comprising the following steps that the catalyst is broken, wherein the abandoned SCR flue gas denitrification catalyst is broken and ground, and catalyst powder being 100 meshes to 200 meshes is obtained; granulating is conducted, wherein the catalyst powder with the weight percent being 1% to 20% is mixed with iron ore powder, a fluxing agent, fuel, return fines and water, and a sintering mixture is obtained through granulating; and sintering is conducted, wherein the sintering mixture is laid on a bedding material of a sintering machine trolley to be sintered, and sintered ores are formed. By means of the method, the abandoned denitrification catalyst can be treated, the leaching amount of heavy metal of a formed sintered body is relatively low, the environment-friendly requirement is met, and meanwhile parts of the sintered ores can meet the performance requirement and used for blast furnace smelting.

Description

technical field [0001] The invention relates to the technical fields of environmental protection and iron and steel metallurgical engineering, in particular to a metallurgical sintering treatment method for a waste SCR flue gas denitrification catalyst. Background technique [0002] Nitrogen oxides (NO x ) is one of the main components of air pollutants and the main cause of photochemical smog and acid rain. In our country 70% NO x Emissions come from the combustion of coal, of which coal consumption in thermal power plants accounts for more than 50% of the country's total, how to effectively control NO x emissions have become the focus of attention in my country and even in the world. Among many treatment methods, Selective Catalytic Reduction (SCR) is the current method to control NO x The most mature and efficient method of emission is also the method with the most industrial application (96%). Catalyst is the core of SCR technology, and its designed service life is ...

AI Technical Summary

Problems solved by technology

The highly toxic vanadium compound is added to the regeneration solution, which will cause serious pollution during use;

[0007] 3) The cost of recycling heavy metals is too high, the benefit is not obvious, and it is not suitable for mass production;

[0008] 4) The space required for landfill is relatively large, and the processing cost is relatively high. For example, the patent application with publication number CN104926235A discloses a treatment and solidification method before the waste SCR denitrification catalyst is buried. , Portland cement, sand and water are mixed and fully stirred into concrete and then poured into blocks. When the strength of concrete cubes is not less than 30mPa, they are respectively plastic-sealed with thick plastic sheets and then buried.

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