Fusion reduction iron-smelting method for directly using concentrate powder

Abstract

The invention belongs to the steelmaking field, and in particular relates to a smelting reduction steelmaking method of using concentrate powder directly. The production line is as follows: the concentrate powder is dried firstly and is pre-heated by the tail gas generated by a secondary rapid circulating fluid bed, the pre-heated concentrate powder enters the rapid circulating fluid bed to be pre-reduced, the metallization rate of the pre-heated iron powder is up to 55 to 80 percent; the pre-reduced iron powder and the coal dust as well as the oxygen are injected into an iron bath furnace to reduce and melt the mineral powder, and the molten iron and slag as well as coal gas are obtained. Compared with the prior art, the smelting reduction steelmaking technique has the advantages of high efficiency, low energy consumption, low pollution and easy implementation.

Description

technical field

[0001] The invention belongs to the field of iron and steel smelting, in particular to a smelting reduction ironmaking method directly using fine ore powder, which is mainly suitable for producing molten iron. Background technique

[0002] In the past 10 years, my country's crude steel output has increased rapidly, from 101.24 million tons in 1996 to 418.782 million tons in 2006, an increase of more than three times in 10 years. Crude steel production in 2006 accounted for 33.79% of global crude steel production, and in 2007 crude steel production reached about 500 million tons.

[0003] Due to the weak foundation of my country's iron and steel industry in the past, the accumulation of scrap steel is small, and the steel output has increased rapidly in the past ten years, therefore, steel production is mainly based on the blast furnace-converter process, while the steel production of the electric furnace process with scrap steel as the main raw material is ve...

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