Vanadium Tungsten Titanium SCR Flue Gas Denitrification Catalyst Preparation from Titanium-Containing Blast Furnace Slag

A large amount of blast furnace slag will be discharged in the process of blast furnace ironmaking. If not properly treated, it will occupy land, pollute the environment and cause waste of resources. Blast furnace slag contains valuable metals such as titanium, silicon, aluminium and calcium. It can be separated, extracted and processed into chemical products by appropriate methods. It can make rational use of industrial waste resources and solve environmental pollution problems.

In addition to Ti, Ca, Si, Al, Mg, Fe, Ti-bearing blast furnace slag also contains a small amount of Mn, K and other elements. In the process of preparing titanium dioxide by acidolysis-hydrolysis, the final product usually contains a small amount of impurities, which greatly affects the quality of the recovered titanium dioxide and its application range. Some scholars have proposed the preparation of SCR flue gas denitrification catalyst from titanium-bearing blast furnace slag. It includes the following steps:

(a)Titanium-bearing blast furnace slag is crushed and leached with sulphuric acid. Titanium liquid and filter slag are obtained after filtration.

(b)Under stirring conditions, the porous catalyst carrier with burnable loss type was added to the titanium solution obtained from step (a) and alkaline compounds were selectively added to adjust pH for hydrolysis.

(c)Step (b) After the hydrolyzed material is filtered, washed and dried, the carrier supported metatitanic acid is obtained.

(d)Tungsten and vanadium were loaded on supported metatitanic acid obtained in step (c) and then calcined to prepare vanadium tungsten titanium SCR catalyst for flue gas denitrification.

The method of preparing SCR catalyst for flue gas denitrification by using titanium-bearing blast furnace slag does not require strict separation and purification of titanium slag leaching solution. The hydrolysis of titanium oxysulfate is coupled with the preparation of carrier supported metatitanic acid, which is the carrier supported metatitanic acid supported vanadium tungsten active component, and the denitrification catalyst is prepared by the carrier supported metatitanic acid supported vanadium tungsten active component. Chemical raw materials and powder denitrification catalysts. This method not only provides a new way for the high value utilization of blast furnace slag, but also effectively reduces the production cost of flue gas denitrification catalyst by using industrial waste as raw material. It is helpful to alleviate the expensive situation of domestic commercial denitrification catalyst, and has important economic and social significance.

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