Preparation method of catalyst for sintering flue gas and desulfurizing and denitrifying

Abstract

The invention provides a method for preparing a catalyst which can realize desulphurization and denitration of sintered fume at the same time, and belongs to the technical field of material preparation and waste gas treatment. In the method, chromium and cerium are taken as main components, active carbon or active coke is taken as a carrier, and the materials are soaked and burned in the atmosphere of inert gas to obtain the catalyst which can effectively catalyze NH3 and reduce NOx into N2 at a low temperature; the catalyst has high low-temperature activity, and can tolerate the interferenceof as high as 6 percent of CO in the system; and simultaneously, the catalyst can also catalyze and oxidize SO2 into SO3 and store the SO3 in the form of (NH4)2SO4, so that the reutilization of the SO2 in the waste gas is realized, and the catalyst has wider application prospect in the desulphurization and denitration operation of the sintered fume.

Description

technical field [0001] The invention relates to a preparation method of a catalyst used for simultaneous desulfurization and denitrification of sintering flue gas, and belongs to the technical field of material preparation and waste gas treatment. Background technique [0002] Nitrogen oxides (NO x , including NO and NO 2 ) emissions have become one of the most important sources of air pollution in my country. my country is the world's largest steel producer, and steel sintering flue gas NO x Emissions account for about NO x 10% of the total discharge has not been treated with denitrification, which has seriously threatened the ecological environment and hindered the sustainable development of economy and society. The composition of sintering flue gas is complex and contains NO x , CO, O 2 , N 2 , SO 2 and a small amount of HCl, and the temperature of the sintering flue gas is relatively low, generally at 80-150°C. These factors make it difficult to treat the sinteri...

AI Technical Summary

Problems solved by technology

Calcium desulfurization is widely used due to its flexible operation and low cost. However, the pressure of sintering flue gas is negative pressure, and its pressure head mainly comes from the air induction device behind the system. The calcium desulfurization process consumes the main pressure head, so the flue gas It is difficult for gas to pass through the denitrification catalyst bed, so the sintering flue gas of metallurgical enterprises is generally discharged directly into the atmosphere after desulfurization