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Method for preparing direct-reduction iron by reducing carbon-containing iron ore powder in microwave heating manner

A technology for microwave heating and iron reduction, applied in furnaces, furnace types, fluidized bed furnaces, etc., can solve the problems of uneven temperature distribution of materials, difficult product quality control, large floor space, etc., to achieve environmentally friendly production, reduce Human workload, the effect of reducing emissions

Inactive Publication Date: 2013-03-20
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the coal-based tunnel kiln canned external carbon method is used to produce direct reduced iron, which has the following disadvantages: (1) Due to the use of producer gas heating method, the heat is from the outside of the material through convection, conduction, radiation and other heat transfer methods from the surface to the inside The transfer takes a long time. The residence time of the existing process materials in the tunnel kiln reaches about 70 hours. It takes 12 hours to preheat to 1150°C, and 43 hours to restore. At the same time, the furnace body with a larger space is required. For heating, the thermal efficiency is low, and there are disadvantages such as long process time and high energy consumption.
(2) It is easy to cause uneven temperature distribution of materials, difficult to control product quality, easy to occur under-burning, over-burning and other phenomena, which will bring processing difficulties to subsequent processes
(3) Large investment and large floor area

Method used

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  • Method for preparing direct-reduction iron by reducing carbon-containing iron ore powder in microwave heating manner

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Experimental program
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Effect test

Embodiment 1

[0026] A. Mix oxidized slag and iron concentrate at a mass percentage of 40:60, mix coke powder and anthracite powder at a mass percentage of 50:50 as a reducing agent, and use 70% iron raw material, 25% reducing agent, The proportion of lightly burned dolomite 5% is blended evenly.

[0027] B. Spread the raw materials prepared in the above step A in a loose shape on the material tray, the height of the material layer is 40mm, push the material tray into the microwave pusher kiln, heat up to 1100°C, reduce for 160min, pump air for 10s every 15min, and then cool it out Iron and iron slag are separated to obtain direct reduced iron products with TFe87.43%, MFe76.07%, and metallization rate of 87.21%.

Embodiment 2

[0029] A. Mix the oxidized slag and iron concentrate at a mass percentage of 35:65, and mix them evenly in proportions of 63% iron raw material, 30% high-quality anthracite powder, and 7% limestone;

[0030] B. Spread the raw materials prepared in the above step A in a loose shape on the material tray, the height of the material layer is 45mm, after the material tray is pushed into the microwave pusher kiln, the temperature is raised to 1150°C, reduced for 180min, ventilated for 10s every 15min, and then cooled out Iron and iron slag are separated to obtain direct reduced iron products with TFe82.43%, MFe74.08%, and metallization rate of 89.97%.

Embodiment 3

[0032] A. Mix the oxidized slag and iron concentrate at a mass percentage of 45:55, and mix them evenly in the proportion of iron raw material 75%, coke powder 22%, and quicklime 3%.

[0033] B. Spread the raw materials prepared in the above step A in a loose shape on the material tray, the height of the material layer is 30mm, after the material tray is pushed into the microwave pusher kiln, the temperature is raised to 1050°C, reduced for 160min, and ventilated for 10s every 15min, and then cooled out Iron and iron slag are separated to obtain direct reduced iron products with TFe90.98%, MFe83.28%, and metallization rate of 91.54%.

[0034] The push plate kiln is powered by 220V power supply, and has 6 groups of microwave sources, each group has 3 phases, each phase averages 12A, the total current is 216 A, and the power is 47.52 kW.

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Abstract

The invention relates to a method for preparing direct-reduction iron by reducing carbon-containing iron ore powder in a microwave heating manner. A microwave heating manner is induced to a coal-based method direct-reduction iron preparation so as to replace the traditional coal heating manner, and high-quality direct-reduction iron is produced by utilizing self-reduction characteristics of iron ore powder, oxidizing slag and the like with coal powder. Through the method for preparing the direct-reduction iron by reducing the carbon-containing iron ore powder, the defects that the reduction time is long, the product quality is unlikely to control, the investment is large, the floor space is large and the like in a process of producing the direct-reduction iron by a coal-based tunnel kiln canning external carbon method can be effectively overcome, the production flow is simplified, the reduction time is largely shortened, the manual cost is reduced, and the certain energy-saving and emission reduction effect can be obtained.

Description

technical field [0001] The invention relates to a method for preparing direct reduced iron by reducing carbon-containing iron ore powder by microwave heating, which is suitable for the development of microwave non-blast furnace ironmaking and the like in areas rich in electric power resources, and belongs to the application field of microwave metallurgy technology. Background technique [0002] As one of the emerging and pioneering cutting-edge technologies, direct reduced iron is a low-carbon porous iron product directly reduced by iron ore and other raw materials under solid conditions, which saves the coking and sintering processes of the blast furnace ironmaking process and can be effectively Overcome the shortcomings of blast furnace ironmaking, such as large investment, high energy consumption, and long process, and better adapt to the trend of modern iron and steel enterprises in the direction of compactness, high efficiency, continuity, high cleanliness, and environme...

Claims

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Application Information

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IPC IPC(8): C21B13/00
Inventor 李轶刘宁斌唐启荣王涛赵红全杨立新
Owner WUKUN STEEL
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