Preprocessing agent for molten iron and method for preparing same

A technology of molten iron pretreatment and production method, applied in the field of molten iron pretreatment agent and its preparation, achieves the effects of low price, saving equipment investment and personnel training costs, and improving the quality of steel

Inactive Publication Date: 2005-11-02
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, hot metal pretreatment is mainly carried out in torpedo cars or ladles, and the pretreatment agent used is artificially synthesized flux (Yang Yindong, Bi Xuegong, Hou Jian, etc. Uti

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 Method for preparing hot metal pretreatment agent by sintering red mud

[0019] The chemical composition of red mud produced by a sintering method is shown in Table 1.

[0020] Ingredients

SiO 2

Fe 2 O 3

Al 2 O 3

CaO

Na 2 O

K 2 O

TiO 2

FeO

MgO

Mass%

23.0

9.4

9.5

41.5

2.6

1.2

8.4

0.60

2.1

[0021] After drying the red mud with Fe 2 O 3 , CaO, CaCl 2 , SiO 2 Perform mixed grinding. The mass percentage of each chemical component in the above mixture is: red mud is 20-25%, Fe 2 O 3 38-45%, CaO 25-32%, MnO 2 3~5%, CaCl 2 2~5%, SiO 2 3~5%, CaO / SiO in the composition of the mixture 2 For 5~7.

[0022] In the preparation of this embodiment, the red mud is first dried, mixed according to the mass percentage of the above mixture, and then ground to a particle size of 120 mesh or less, which can be used as a desiliconizer or dephosphorization and desulfurizer for m...

Embodiment 2

[0024] Example 2 Method for preparing hot metal pretreatment agent using Bayer process red mud

[0025] The chemical composition of red mud produced by a sintering method is shown in Table 2:

[0026] Ingredients

SiO 2

Fe 2 O 3

Al 2 O 3

CaO

Na 2 O

K 2 O

TiO 2

FeO

MgO

Mass%

12.0

23.3

17.1

15.2

4.5

1.3

5.9

5.4

2.8

[0027] After drying the red mud with Fe 2 O 3 , CaO, Na 2 CO 3 , MnO 2 , CaCl 2 , SiO 2 Perform mixed grinding. The mass percentage of each chemical component in the above mixture is: red mud is 15-19%, Fe 2 O 3 40-45%, CaO 30-38%, Na 2 CO 3 0~3%, MnO 2 0~4%, CaCl 2 0~3%, SiO 2 5-9%, CaO / SiO in the composition of the mixture 2 It is 3.0~6.0.

[0028] The preparation of this embodiment is to first dry the red mud, mix it according to the mass percentage of the above mixture, and then grind it to a particle size of 120 mesh or less, which can be used as ...

Embodiment 3

[0030] Example 3 Method for preparing hot metal pretreatment agent by sintering method and Bayer process red mud mixed slag

[0031] A mixture of sintering method and Bayer method red mud, its chemical composition is shown in Table 3:

[0032] Ingredients

SiO 2

Fe 2 O 3

Al 2 O 3

CaO

Na 2 O

K 2 O

TiO 2

FeO

MgO

Mass%

20.5

11.5

7.2

41.1

2.5

1.2

3.4

1.7

3

[0033] After drying the mixed red mud with Fe 2 O 3 , CaO, Na 2 CO 3 , CaCl 2 , SiO 2 Perform mixed grinding. The mass percentage of each chemical component in the above mixture is: red mud is 15-20%, Fe 2 O 3 38~43% is, CaO is 30~38%, Na 2 CO 3 1~3%, CaCl 2 1~5%, SiO 2 5-10%, CaO / SiO in the composition of the mixture 2 For 3~7.

[0034] The preparation of this embodiment is to first dry the red mud, mix it according to the mass percentage of the above mixture, and then grind it to a particle size o...

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PUM

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Abstract

The invention relates to a production process using red mud as hot-metal preparation compound. The technical project is that mix equably the dried red mud with Fe2O3, CaO, Na2CO3, MnO2, CaCl2, SiO2 or other smeltery wastes that contain these compositions. The mass fraction of the mixture is: red mud being15 to 30 percent, Fe2O3 being 38 to 45 percent, CaO being 25 to 40 percent, Na2CO3 equal to or less than 5 percent, CaCl2 equal to or less than 5 percent, SiO2 equal to or less than 10 percent, and CaO/SiO2 being 3.0 to 7.0. The mass fraction of main chemical constituent in red mud is: SiO2 equal to or less than 25 percent, Fe2O3 equal to or more than 20 percent or CaO equal to or more than 40 percent. The invention with red mud as raw material has a characteristic of resource recovery, cleaning production, protecting environment, low cost, and no needing of changing the present equipment and operation.

Description

1. Technical Field [0001] The invention belongs to a production method of a hot metal pretreatment agent. In particular, it relates to a production method using red mud as a pretreatment agent for molten iron. 2. Background technology [0002] Red mud is the waste produced in the process of extracting alumina from bauxite ore. At present, the world produces more than 60 million tons of red mud every year. In 2003, the domestic alumina output was about 5.5 million tons, and the annual amount of red mud discharged should be more than 6 million tons. Together with the accumulated accumulation over the years, the amount is quite considerable. A large amount of red mud will not only occupy good land, but also free alkali and other harmful components will also pollute the environment. Alumina plants generally use flat ground to build platforms, river valley dams, recessed land filling and other methods to pile up red mud. Because no protective measures are taken, the red mud waste liqu...

Claims

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Application Information

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IPC IPC(8): C21C1/00
Inventor 杨印东李光强毕学工张鹏科金焱
Owner WUHAN UNIV OF SCI & TECH
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