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Special kaolin for crystallizer covering slags as well as preparation method and application of special kaolin

A technology of mold mold powder and kaolin, which is applied in the field of continuous casting and pouring steel, can solve problems such as deterioration of lubrication, bonding breakouts, temperature fluctuations, etc., and achieve the advantages of reducing bonding and breakouts, improving lubrication conditions, and strong crystallization performance Effect

Inactive Publication Date: 2018-06-12
胡毅婧
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rapid and large amount of crystallization near the meniscus will easily lead to too thin liquid slag film in this area, which will increase the friction force on the primary shell, especially in the case of high pulling speed, the fluctuation of the liquid level may lead to temperature fluctuations near the meniscus , if the crystallization performance of mold flux is too strong, it will easily lead to the precipitation of a large amount of solid phase substances near the meniscus, which will deteriorate the lubrication and even lead to bonding breakout
[0005] Although there are a series of prevention methods for liquid level fluctuations, such as flow field optimization, electromagnetic braking, close-packed rollers, etc., they have not fundamentally solved the contradiction between mold slag lubrication and heat transfer. Especially in continuous casting
Therefore, the characteristics of traditional high crystalline mold flux limit the high casting speed of continuous casting peritectic steel slabs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1: Separating the kaolin mineral material from clay and impurities, and then adding 4 times of water to make a slurry to obtain the first slurry of kaolin slurry;

[0023] Step 2: mix the first slurry of kaolin slurry and hydrosulfite according to the mass ratio of kaolin slurry: hydrosulfite=1:0.001, and then adjust its pH value to 5 to obtain the second slurry of kaolin slurry;

[0024] Step 3: placing the second slurry of kaolin slurry obtained in step 2 in an ion exchange agitator equipped with a solid ion exchange resin, and stirring for 0.5 hours to obtain the third slurry of kaolin slurry;

[0025] Step 4: separating the solid ion exchange resin contained in the third slurry of the kaolin slurry obtained in step 3 to obtain the kaolin slurry concentrate;

[0026] Step 5: washing and drying the kaolin pulp concentrate obtained in step 4.

[0027] The special kaolin for mold flux obtained in this embodiment includes the following components in parts by weight...

Embodiment 2

[0029] Step 1: Separating the kaolin mineral material from clay and impurities, and then adding 8 times of water to make a slurry to obtain the first slurry of kaolin mineral slurry;

[0030] Step 2: mix the first slurry of kaolin slurry and hydrosulfite according to the mass ratio of kaolin slurry: sodium hydrosulfite=1:0.002, and then adjust its pH value to 2 to obtain the second slurry of kaolin slurry;

[0031] Step 3: placing the second kaolin slurry obtained in step 2 in an ion exchange agitator equipped with a solid ion exchange resin, and stirring for 2 hours to obtain the third kaolin slurry;

[0032] Step 4: separating the solid ion exchange resin contained in the third slurry of the kaolin slurry obtained in step 3 to obtain the kaolin slurry concentrate;

[0033] Step 5: washing and drying the kaolin pulp concentrate obtained in step 4.

[0034] The special kaolin for mold flux obtained in this embodiment includes the following components in parts by weight: 65.8 ...

Embodiment 3

[0036] Step 1: Separating the kaolin mineral material from clay and impurities, and then adding 6 times of water to make a slurry to obtain the first slurry of kaolin mineral slurry;

[0037] Step 2: Mix the first slurry of kaolin slurry and hydrosulfite according to the mass ratio of kaolin slurry: sodium hydrosulfite=1:0.0015, and then adjust its pH value to 3 to obtain the second slurry of kaolin slurry;

[0038] Step 3: placing the second slurry of kaolin slurry obtained in step 2 in an ion exchange agitator equipped with a solid ion exchange resin, and stirring for 1.5 hours to obtain the third slurry of kaolin slurry;

[0039] Step 4: separating the solid ion exchange resin contained in the third slurry of the kaolin slurry obtained in step 3 to obtain the kaolin slurry concentrate;

[0040] Step 5: washing and drying the kaolin pulp concentrate obtained in step 4.

[0041] The special kaolin for mold flux obtained in this embodiment includes the following components in...

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Abstract

The invention discloses special kaolin for crystallizer covering slags, belongs to the technical field of continuous casting of cast steel and aims to effectively harmonize contradiction of covering slag lubrication ingot casting and heat transfer control in a continuous casting process. The special kaolin for the crystallizer covering slags comprises the following components in parts by weight: 65-66 parts of SiO2, 25-26 parts of Al2O3, 1.5-2 parts of Fe2O3, 1-2 parts of CaO and 1-2 parts of MgO. The special kaolin disclosed by the invention is applied to production of the crystallizer covering slags which are applied to a continuous casting process of the cast steel.

Description

technical field [0001] The invention relates to the technology of continuous casting and pouring steel, in particular to a kind of kaolin specially used for mold mold slag and its preparation method and application. Background technique [0002] In the process of continuous casting, due to the occurrence of peritectic reaction during the solidification of molten steel, the shell of the primary slab shrinks greatly, and the growth is not easy to be uniform, and longitudinal cracks are likely to occur due to stress concentration. Therefore, the mold slag film is required to have a strong ability to control heat transfer near the meniscus, so as to control the heat transfer from the slab to the mold, so as to uniform the shell of the primary slab and reduce the incidence of longitudinal cracks on the surface of the slab. [0003] In response to this problem, researchers have tried various solutions, such as coating copper plates on the upper part of the crystallizer to reduce h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 胡毅婧穆海超肖玉胡光莉
Owner 胡毅婧
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