Method for increasing direct reduced iron metallization rate by industrial wastes containing iron and carbon

A metallization rate and reduced iron technology, applied in fluidized bed furnaces and other directions, can solve problems such as difficult application and high price, and achieve the effects of reducing pollution, improving metallization rate, and increasing output

Inactive Publication Date: 2009-11-18
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on this principle, conventional coke powder, coal powder and other carbon-containing materials are not suitable as internal additives for the production of direct reduced iron

Method used

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  • Method for increasing direct reduced iron metallization rate by industrial wastes containing iron and carbon

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The chemical composition of the raw materials used is shown in Table 1:

[0027] Table 1 Iron raw material chemical composition %

[0028] Mineral

TF

FeO

SiO 2

CaO

MgO

Al 2 o 3

S

P

C

Oxide slag

71.73

49.41

1.79

0.87

0.33

0.46

0.021

0.035

/

iron concentrate

62.97

23.88

7.44

0.46

0.79

1.49

0.009

0.024

/

Blast Furnace Dust Removal

Ash

57.33

/

1.2

4.01

0.99

0.86

0.164

0.122

2.67

[0029] The method of the present invention is through the following steps:

[0030] A. Mix additives according to the following mass percentages:

[0031] Blast Furnace Dust 95%

[0032] Rice husk powder 5%

[0033] B. Then mix the raw materials according to the following mass percentages:

[0034] Additives 14%

[0...

Embodiment 2

[0043] The method of the present invention is through the following steps:

[0044] A. Mix additives according to the following mass percentages:

[0045] Blast Furnace Dust 98%

[0046] Sawdust 2%

[0047] B. Then mix the raw materials according to the following mass percentages:

[0048] Additives 12%

[0049] Oxide residue 30%

[0050] Iron Concentrate 30%

[0051] Coke powder 22%

[0052] Limestone 6%

[0053] C. Mix the additives, oxidized slag, and iron concentrate in the above B step evenly, press them into blocks according to the conventional method, and at the same time crush the coke and limestone according to the conventional methods, mix the two evenly, and then directly reduce the iron according to the conventional tunnel kiln The above-mentioned raw materials are first loaded into tanks and then loaded into trucks, and then sent to the tunnel kiln to ignite the gas, and at the same time, the air is blown to support the combustion, and the temperature is ra...

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Abstract

The invention provides a method for increasing direct reduced iron metallization rate by industrial wastes containing iron and carbon. The method is to mix the industrial wastes containing iron and carbon with the mass ratio of 95 to 99 percent and vegetable powder with the weight ratio of 1 to 5 percent into additive, mix 7 to 20 percent of the additive, 50 to 70 percent of iron raw material, 18 to 25 percent of reducing agent, and 5 to 8 percent of fusing agent by mass ratio, charge, heat and reduce the mixture according to the process of conventional direct reduced iron to obtain an iron product. The method can obviously improve the metallization ratio of direct reduced iron so as to improve the yield of reduced iron, reduce energy consumption, comprehensively utilize the industrial wastes containing iron and carbon, reduce pollution of the industrial wastes on the environment and harm on the main production process of steel and iron plants, and find a perfect approach for the industrial wastes containing iron and carbon.

Description

technical field [0001] The invention relates to a method for increasing the metallization rate of direct reduced iron, in particular to a method for increasing the metallization rate of direct reduced iron by using industrial waste containing iron and carbon in iron and steel plants, and belongs to the technical field of direct reduced iron smelting. Background technique [0002] The process of directly reducing iron in a tunnel kiln, that is, the Heganus coal-based tunnel kiln reduction method, was invented by the Swedish company Hegnas in the early 20th century. The process is to put iron ore powder, coal powder as a reducing agent, and lime powder as a desulfurizing agent into the reduction tank respectively according to the set ratio and charging method, and then put the reduction tank on the trolley and push it into the tunnel. In the kiln, direct reduced iron is obtained after heating, roasting and reduction. The tunnel kiln process was first applied in the powder met...

Claims

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Application Information

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IPC IPC(8): C21B13/00
Inventor 杨雪峰赵红全李轶
Owner WUKUN STEEL
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