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Producing process of directly reducing iron

A direct technology for reducing iron, applied in the field of metallurgy, can solve the problems of high total energy consumption, cumbersome production of rotary kiln, complicated process, etc., and achieve the effect of reducing overall cost, shortening reduction time, and reducing manufacturing cost

Active Publication Date: 2006-11-15
上海彭浦冶金辅料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] According to the resource situation in our country, coal-based rotary kiln and coal-based fixed bed method (tunnel kiln method or tank method) are commonly used at present. Although the fuel used in the rotary kiln method is highly reactive non-coking coal, the price is lower than that of gas-based It is cheap, but the reduced pellets need to be isolated from the air to prevent re-oxidation in order to obtain direct reduced iron (sponge iron). Rotary kiln, due to the problem of the baking strength of the cold-consolidated pellets, the production is difficult to stabilize, the production process is easy to form rings, and the infrastructure investment is large, the total energy consumption is high, the coal-based fixed bed method (tunnel kiln or tank method) It is a direct reduction iron (sponge iron) production method with a long history. Its problems are high energy consumption, large investment, low output and a large amount of clay pots (8 to 10 times) are consumed in production. Clay combined with silicon carbide pots ( 100 to 120 times) makes the final product cost high. The raw materials used in traditional coal-based rotary kilns and coal-based fixed beds are iron ore chilled pellets and iron concentrate powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Adopt 50% converter dedusting dust, 50% iron ore concentrate powder to mix, its total iron Tfe (ferrous oxide, ferric oxide, ferric oxide) is 67.3% iron oxide 21.47kg and presses into diameter 150 * 230mm, Put 2 cylindrical pieces with a diameter of 60 mm in the middle hole into the reduction tank, add 8 kg of reducing agent and desulfurizing agent around and in the middle, heat to 1250 ° C with oxygen-enriched gas, and take out the obtained product after cooling for 21 hours.

[0028] TF

[0029] The waste gas is treated with high temperature dedusting to obtain 0.4 kg of zinc oxide with a zinc oxide content of 85%.

Embodiment 2

[0031] Use 50% converter dust and 50% iron concentrate powder to mix, its TFe is 67% iron oxide 21.02kg, press into 52 balls with a diameter of 50mm, put them into the reduction tank, and add a mixture of reducing agent and desulfurizer 8.5kg at the same time Divide into four layers, heat to 1230°C with oxygen-enriched gas and cool for 23 hours, then take out the obtained product.

[0032] TF

[0033] The exhaust gas was treated with a high-temperature dust collector to obtain 0.36 kg of zinc oxide with a zinc oxide content of 83.65%.

Embodiment 3

[0035] Use 60% electric furnace dust removal, 40% iron concentrate powder to mix, its TFe is 63.46% iron oxide 20.35kg, press into a cylindrical shape with a diameter of 150×230mm, and the diameter of the middle hole is 60mm. Put 8.34kg of the mixture of reducing agent and desulfurizing agent into it, heat it to 1200°C with oxygen-enriched gas, keep it warm for 25 hours, and take out the obtained product after cooling.

[0036]

[0037] The exhaust gas was treated with a high-temperature dust collector to obtain 0.89 kg of zinc oxide, with a zinc oxide content of 89.63%.

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PUM

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Abstract

This invention relates to metallurgy, it especially relates to produce reduced iron with dust (includes converter and electric furnace) and iron concentrate powder in solid state directly. The material uses dust (included converter and electric furnace) and iron concentrate powder, then blazes by gas which have high level oxygen, the tank is made by the conjunction of resin and carbofrax (180-200 times), it also can oxygenize the silicon to silicon dioxide which can be collected with exhaust gas, this not only avoids the disadvantage of the existing technology, but also saves the material resource and makes the waste to good.

Description

technical field [0001] The invention relates to metallurgy, in particular to a method for producing direct reduced iron (sponge iron) in a solid state by using dust removal dust (including converters and electric furnaces) and iron concentrate powder. Background technique [0002] In recent years, my country's iron and steel industry has developed rapidly and has become the world's largest steel producer. However, the structure of my country's iron and steel products needs to be adjusted, and the quality of iron and steel products needs to be improved. High-quality clean steel and high-quality steel are far from being able to meet The needs of the development of the national economy and the continuous development of the iron and steel industry have encountered many difficulties, the supply of fuel and raw materials is tight, the price is rising continuously, the composition of scrap steel is complex, and the alloy elements and harmful impurities contained in it fluctuate great...

Claims

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Application Information

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IPC IPC(8): C21B13/04
Inventor 吴秋华
Owner 上海彭浦冶金辅料有限公司