Metallized charge for treating blast furnace hearth accumulation and using method thereof

Abstract

The invention discloses a metallized charge for treating blast furnace hearth accumulation and a using method of the metallized charge. The metallized charge is prepared from, by mass, 10-20% of HBI,5-35% of metallized pellets, 10-20% of scrap steel, 0-5% of lump ore and the balance sinter. The using method of the metallized charge comprises the steps that after accumulation of a blast furnace hearth is detected, stopping of the furnace is not needed, the metallized charge is directly adopted for blast furnace ironmaking, after the accumulation of the hearth does not exist, conventional charge is selected for smelting, and the whole process does not reduce production or reduces little production. The furnace charge structure is optimized and matched with a corresponding processes, so thatthe coke ratio of the blast furnace can be reduced by 20-45%, the burden of direct reduction at the lower part of the blast furnace can be obviously reduced, the furnace charge structure can be usedas a furnace condition seasoning of the blast furnace, when the accumulation of the blast furnace hearth occurs, a certain yield is maintained through the use of the metallized charge, and meanwhile,the hearth melt has higher carbon capacity due to the lower carbon content of the metallized charge, and removal of accumulation is accelerated.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for treating metallized charges piled up in a hearth of a blast furnace and a method for using the same. Background technique [0002] As the main process in the ironmaking process, the blast furnace exists with its three major advantages of high output, low consumption and economy. It is foreseeable that it will still exist in an unshakable position in the iron and steel process until the industrial application technology of economical new energy is popularized in the future. [0003] The essence of the blast furnace is a vertical moving bed of counter-current heat exchange, and the direct flow is the premise and basis for achieving all indicators of high production, high quality and low fuel ratio. The performance of blast furnace hearth accumulation is a phenomenon that the effective working space of the blast furnace hearth is reduced, resulting in thermal system fluctuatio...

AI Technical Summary

Problems solved by technology

[0004] When such furnace conditions deteriorate, ...