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Iron and steel gas based smelting and reducing process with iron-ore powder pre-reduced

A technology of iron ore powder and process, which is applied in the fields of iron and steel metallurgy, non-blast furnace ironmaking and hydrogen energy metallurgy, can solve the problems of high energy consumption, high cost, long investment payback period, etc., and achieve the effect of low energy consumption

Inactive Publication Date: 2006-08-16
沈阳东方钢铁有限公司
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide an iron ore powder pre-reduction gas-based smelting reduction ironmaking and steelmaking process to solve the problems of large energy consumption, high cost and long investment recovery period in the non-blast furnace ironmaking process

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  • Iron and steel gas based smelting and reducing process with iron-ore powder pre-reduced

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Embodiment Construction

[0013] In the iron ore powder pre-reduction gas-based smelting reduction ironmaking and steelmaking process invented, the iron ore powder is used as raw material, which is directly fed into the mill together with coal powder or low-quality coke powder and lime powder, and finely processed by a special ball mill. Grinding, heating to 650-680°C, adding part of oxygen and gas for pre-reduction. The pre-reduced iron powder is added to the mixed carbon powder, mineral powder, lime powder, and reduced iron, and then blended into another rotary kiln. Oxygen and gas are added to make the pre-reduced iron powder go through the rotary kiln and heat up to 850°C-900°C. Further heating and fine reduction, the reduced product, after dust removal and secondary reduction, is put into a heat preservation tank while it is hot, and then poured into a smelting reduction furnace, and oxygen and coal gas are used as heat sources, and hot reduced iron and part of granules are added. Coke (low-streng...

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Abstract

The invention is about the technology of the iron ore powder prereducing melted reducing puddling and the steel-making based on the air. It is to put the iron ore powder, the breeze or the inferior coke powder and the pulverized lime into the grinder, then heat the mixture to the 500-700 DEG C to prereduce; In this time, the oxygen or the gas is added into it, so the iron ore powder is reduced to the iron powder directly. And the carbon powder, the ore powder, the pulverized lime and the reduced iron are mixed into another rotary kiln with the oxygen and the gas. The kiln is heated to 800-950 DEG C, so it is reduced to the refined iron powder with 95% iron, last to put it into the fused reduced furnace in which the reduced iron and the grain coke are heated by the oxygen and the reduced air to melt to form the iron water with 3-4% carbon. The offgas of the technology can be recovered to use, so the energy cost is lower than the other technology.

Description

(1) Technical field: [0001] The invention relates to the fields of iron and steel metallurgy, non-blast furnace ironmaking, hydrogen energy metallurgy, etc., and specifically relates to an iron ore powder pre-reduction gas-based smelting reduction ironmaking and steelmaking process. (2) Technical background: [0002] The development of non-blast furnace ironmaking technology is the goal pursued by metallurgists for many years. At present, there are Corex method, HisMelt method, Finex method, Midrex method, HYL method, FinMet method, Drylron method, etc. which have realized non-blast furnace ironmaking and industrialized production all over the world. In order to reduce the cost, the fluidized bed process that directly uses ore powder as raw material has been researched and developed, but with little success. At present, the most promising methods are the HisMelt method and the Finex method studied by Posco, both of which use fine ore direct reduction, and have completed pil...

Claims

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Application Information

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IPC IPC(8): C21B13/08C22B5/10C22B5/12
Inventor 周久乐
Owner 沈阳东方钢铁有限公司
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