Catalytic combustion-supporting addictive for blast furnace sprayed coal and its addition method

Abstract

The invention provides the high furnace catalysis combustion addition agent and addition method, comprising metallic oxide, transition metal chloride, rare-earth metal oxide, alkaline earth oxide, perovskite structure oxide, and using the mechanical mixing technology. The method is highly effective, safe and convenience. And the method reduces the coke ratio, improves the burning velocity, availability of coal powder, and coal-to-coke replacement.

Description

technical field [0001] The invention relates to the technical field of smelting, and relates to a blast furnace coal injection catalytic combustion-supporting additive for improving the coal coke replacement ratio of an ironmaking blast furnace and an adding method thereof. Background technique [0002] At present, there are various deficiencies in various catalytic combustion-supporting additives used in this field, for example: Patent CN1112163A, the addition of combustion-supporting agent is 1-20% of the raw coal weight, preferably 2-8%, when the addition is less than 1%, the effect Not obvious; patent application number 02133147.2, its formula contains KMnO 4 , while KMnO 4 The decomposition temperature is only 248°C, which poses a certain hidden danger to the safety of the pulverizing system. As we all know, blast furnace coal injection, especially bituminous coal injection, is a technology with extremely high safety requirements. The increase of oxygen content in the...

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Problems solved by technology

[0002] At present, there are various deficiencies in various catalytic combustion-supporting additives used in this field, for example: Patent CN1112163A, the addition of combustion-supporting agent is 1-20% of the raw coal weight, preferably 2-8%, when the addition is less than 1%, the effect Not obvious; patent application number 02133147.2, its formula contains KMnO 4 , while KMnO 4 The decomposition temperature is only 248°C, which poses a certain hidden danger to the safety of the pulverizing system

As we all know, blast furnace coal injection, especially bituminous coal injection, is a technology with extremely high safety requirements. The increase of oxygen content in the system and the decrease of ignition point will bring new safety hazards; the combustion accelerant in patent application No. 02133147. 200°C, react for 5 hours, the addition method is complicated, and special equipment is required; the combustion-supporting additive reported in the article "Application Effect of Combustion-Adjuvant in Blast Furnace Coal Injection" in Modern Metallurgy, 2001(2): 27-29 is usually used as a liquid It is transported on the coal bed before pulverized coal is used, and the addition amount is about 350-600ml / t coal. The addition amount is large, the cost is high, and it contains elements K, Na, Cl, etc. that are unfavorable to the production quality of the blast furnace; patent application number 02133147.2, Patent application number 90106347.9, patent number ZL01138848.x, etc. all contain K, Na, Cl and other elements that are harmful to the production quality of blast furnaces