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Fusion reduction iron-smelting method for directly using concentrate powder

A concentrate powder, direct technology, applied in the field of molten iron production, smelting reduction ironmaking, can solve problems such as erosion of furnace lining, achieve the effect of reducing heat load, easy to realize, and reduce the burden of reduction

Active Publication Date: 2008-09-10
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Due to the high secondary combustion method used in the smelting reduction furnace, an oxidative atmosphere appears in the furnace, which seriously corrodes the furnace lining

Method used

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  • Fusion reduction iron-smelting method for directly using concentrate powder
  • Fusion reduction iron-smelting method for directly using concentrate powder
  • Fusion reduction iron-smelting method for directly using concentrate powder

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Embodiment Construction

[0041] The iron ore powder used in the embodiment of the present invention is magnetite concentrate powder and Australian mineral powder (see Table 1 for composition). The Australian mineral powder is crushed and its average particle size is 0.3mm. The total carbon in the used coal powder is 85%, and the ash content is 12%. Process equipment includes iron bath furnace, drum dryer, preheating device (rapid circulating fluidized bed), 2-stage rapid circulating fluidized bed pre-reduction reaction device, gas adjustment furnace, heat exchange device, dehydration and dust removal device, VPSA, gas Supercharger, coal-oxygen spray gun system, oxygen supply system (using oxygen cylinders), PLC automatic control system, etc., see the process flow image 3 . The experimental output is 1t of molten iron / h, the temperature of molten iron is controlled at 1450°C±20°C, and the temperature of slag is controlled at 1500±20°C. The implementation process parameters and results are shown in T...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00
CPCY02P10/122Y02P10/20
Inventor 赵沛李明克郭培民赵松一齐渊洪曹洪良庞建明张金昌曹朝真谢洪儒
Owner CENT IRON & STEEL RES INST
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