Self-fluxing cold-pressed composite furnace charge for blast furnace ironmaking and preparation method of self-fluxing cold-pressed composite furnace charge

Abstract

The invention discloses a self-fluxing cold-pressed composite furnace charge for blast furnace ironmaking and a preparation method of the self-fluxing cold-pressed composite furnace charge, and aims to mainly solve the technical problem that existing fine-powder iron-containing waste such as scrap iron cannot be directly used as a blast furnace ironmaking furnace charge. The self-fluxing cold-pressed composite furnace charge for blast furnace ironmaking is characterized by comprising, by weight, greater than or equal to 85% of Fe, 1.5-3.0% of SiO2, 1.0-3.0% of CaO, 2-5% of HO2 and the balance inevitable impurities, and the sum of the weight percentages of the components is 100%. The normal-temperature drop strength of the cold-pressed composite furnace charge is greater than or equal to 6 times / 3 m.piece. The cold-pressed composite furnace charge can be used as a furnace charge for increasing the yield and saving the energy of a blast furnace and can also be used as a furnace charge for adjusting the condition of the blast furnace.

Description

technical field [0001] The invention relates to a charge for blast furnace ironmaking, in particular to a self-melting cold-pressed composite charge for blast furnace ironmaking and a preparation method thereof, belonging to the technical field of blast furnace ironmaking. Background technique [0002] At present, China produces about 200 million tons of scrap steel every year, more than 80% of which can be recycled for converter steelmaking. However, some of them are scrap steel such as iron shavings and processed iron filings. Due to the limitation of technological and economic conditions, this part of scrap steel is difficult to produce. Directly used in the steelmaking process, the blast furnace has significant advantages in the yield of iron and smelting efficiency. If these iron-containing wastes can be used in blast furnace ironmaking, the economic and technical level of its application can be significantly improved. [0003] Since the blast furnace smelting process h...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a self-melting cold-pressed composite charge for blast furnace ironmaking and its preparation method, which mainly solves the technical problem that the existing iron filings and other fine powdery iron-containing wastes cannot be directly used as blast furnace ironmaking charge. The cold-pressed composite charge of the present invention satisfies the requirements of blast furnace ironmaking for the charge, and the metallurgical performance of the cold-pressed composite charge is good. The use of the cold-pressed composite charge of the present invention can significantly improve the production efficiency of the blast furnace and reduce the energy consumption of blast furnace smelting