A steelmaking device and method

Abstract

The invention relates to a steelmaking device and a steelmaking method. The steelmaking device comprises a reducing gas processing device and a smelting device, wherein the smelting device comprises a prereduction area, a soft melting area and a fusion area which are sequentially communicated, the fusion area is provided with an electrode and a flux spray gun, the reducing gas processing device is provided with an air inlet pipe and an exhaust pipe, the air inlet pipe is communicated with the soft melting area, and the exhaust pipe is communicated with the prereduction area. According to the steelmaking method, reducing gas is used for prereducing pellets or sintering ore materials, arc heat generated by the electrode is used for heating and melting the prereduced metallized pellets, high temperature flue gas generated in the process is used for deeply preheating and reducing the metallized pellets, and the flux sprayed by the spray gun is used for refining the molten steel. The steelmaking processes are reduced, middle steps of transporting materials are saved, the investment and production cost are lowered, the resource and energy consumption is lowered, emission of harmful gases is reduced, and the steelmaking device and the steelmaking method have very high economic value, environment protection property and social benefits.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a steelmaking device and method. Background technique [0002] At present, there are two kinds of technological processes for steelmaking production, one is the long process of blast furnace-converter process using iron ore as raw material, and the other is the short process of electric furnace process using scrap steel and direct reduced iron as raw material. The long-flow process has gone through the repeated process of metal oxide reduction and re-oxidation in iron ore, that is, the iron ore is first reduced in a blast furnace with coke as a reducing agent to obtain alloy elements such as Fe, Mn, Si, etc. The carbon is removed to obtain qualified molten iron, and then the molten iron is transferred to the steelmaking workshop, where it is decarburized and heated by oxygen blowing in the converter, thereby smelting into qualified molten steel; this process has the disadvanta...

AI Technical Summary

Problems solved by technology

The long-flow process has gone through the repeated process of metal oxide reduction and re-oxidation in iron ore, that is, the iron ore is first reduced in a blast furnace with coke as a reducing agent to obtain alloy elements such as Fe, Mn, Si, etc. The carbon is removed to obtain qualified molten iron, and then the molten iron is transferred to the steelmaking workshop, where it is decarburized and heated by oxygen blowing in the converter, thereby smelting into qualified molten steel; this process has the disadvantages of high investment, large area occupation, high energy consumption, and environmental pollution. serious problems

The short-process process is melted by electric furnace, does not require coke, and the investment and energy consumption are relatively low. However, there is no short-process process for direct steelmaking from iron ore in industrial production.

[0003] Patent No. 98100242.0 patent "iron ore one-step steelmaking method". This process uses reduced coal and oxygen as fuel to provide reducing gas and energy input. There are problems such as large amount of carburization, high oxygen consumption, and high impurity content in the process.

Patent No. 99809948.1 "direct smelting method and equipment" discloses a method of directly smelting metal-containing raw materials, pretreating coal with oxygen to generate carbon and combustible gas, injecting metal-containing raw materials, carbon and oxygen-containing gas into the direct Smelting vessel, in the direct smelting vessel, carbon is used as energy source and reducing agent to smelt metal-containing raw materials into molten metal; The processed product is used for direct smelting, but this method is only used for the production of molten iron

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