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Method for preparing ladle liner permanent layer by adopting perlite composite insulation board

A technology of thermal insulation board and perlite is applied in the field of using perlite composite thermal insulation board to prepare the permanent layer of ladle lining, which can solve the problem that it is difficult to achieve continuous casting process, the temperature gradient of molten steel pouring is narrow, the service life of permanent layer lining is not long, and the The reduction of shell strength and creep resistance can achieve the effect of prolonging the argon blowing time and waiting time, reducing liquid metal crusting, and increasing the packaging age.

Inactive Publication Date: 2012-05-30
湖北兴冶特钢实业发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these refractory materials have a large thermal conductivity, which can easily lead to the following problems: 1. The temperature drop is relatively fast. Generally, it is compensated by increasing the tapping temperature or by refining the temperature, which will inevitably result in prolonged smelting time and a large consumption of energy and raw materials.
2. The high heat flux of the system causes the temperature of the ladle shell to be too high. The average temperature of the outer wall of the cladding can reach about 250-330°C on site, the strength and creep resistance of the cladding decrease, and the steel cladding is damaged due to thermal deformation.
3. The service life of the lining of the working layer and the permanent layer is not high, and it is difficult to ensure the uniform temperature of the molten steel
4. Due to the large temperature drop of molten steel, it is difficult to meet the requirement of narrow temperature gradient of molten steel pouring in continuous casting process, which affects the quality of cast slab

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The expanded perlite, magnesite cement and carbon fiber cloth are uniformly mixed under stirring conditions, and the mixing ratio is expanded perlite:magnesite cement:carbon fiber cloth=1:0.3:0.02 to obtain a mixed material. Wherein the stirring speed is 200rpm, and the stirring time is 3h.

[0022] Put the mixed material into the mold, press the surface flat, and then harden at 15°C for 10 hours to obtain the perlite composite insulation board.

[0023] The above-mentioned perlite composite insulation board is cut into shape, and then spliced ​​on the inner wall of the ladle shell to form a permanent layer of the ladle lining; then, refractory bricks or castables are built inside the permanent layer of the ladle lining to complete the preparation of the ladle.

[0024] The permanent layer density of the above ladle lining is 420Kg / m 3 , the compressive strength is 1.2MPa, the thermal conductivity is 0.05w / m·k, after many tests, there is no adverse phenomenon in the lo...

Embodiment 2

[0026] The expanded perlite, magnesite cement and carbon fiber cloth are uniformly mixed under stirring conditions, and the mixing ratio is expanded perlite:magnesite cement:carbon fiber cloth=1:0.5:0.03 to obtain a mixed material. Wherein the stirring speed is 150rpm, and the stirring time is 4h.

[0027] Put the mixed material into the mold, press the surface flat, and then harden at 30°C for 0.2h to obtain the perlite composite insulation board.

[0028] The above-mentioned perlite composite insulation board is cut into shape, and then spliced ​​on the inner wall of the ladle shell to form a permanent layer of the ladle lining; then, refractory bricks or castables are built inside the permanent layer of the ladle lining to complete the preparation of the ladle.

[0029] The permanent layer density of the above-mentioned steel ladle lining is 440Kg / m 3 , the compressive strength is 1.5MPa, the thermal conductivity is 0.06w / m·k, after many tests, there is no adverse phenomen...

Embodiment 3

[0031] The expanded perlite, magnesite cement and carbon fiber cloth are uniformly mixed under stirring conditions, and the mixing ratio is expanded perlite:magnesite cement:carbon fiber cloth=1:0.8:0.04 to obtain a mixed material. The stirring speed is 100 rpm, and the stirring time is 5 h.

[0032] Put the mixed material into the mold, press the surface flat, and then harden at 50°C for 1 hour to obtain the perlite composite insulation board.

[0033] The above-mentioned perlite composite insulation board is cut into shape, and then spliced ​​on the inner wall of the ladle shell to form a permanent layer of the ladle lining; then, refractory bricks or castables are built inside the permanent layer of the ladle lining to complete the preparation of the ladle.

[0034] The permanent layer density of the above-mentioned steel ladle lining is 460Kg / m 3 , the compressive strength is 1.8MPa, the thermal conductivity is 0.07w / m·k, after many tests, there is no adverse phenomenon i...

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Abstract

The invention relates to a method for preparing a ladle liner permanent layer by adopting a perlite composite insulation board, which comprises the preparation of a perlite composite insulation board and the arrangement of the perlite composite insulation board on a ladle shell inner wall. The method for preparing the perlite composite insulation board comprises the following steps of: (1) evenlymixing 1 percent by weight of expanded perlite, 0.3-1.2 percent by weight of adhesive and 0.02-0.06 percent by weight of fiber materials under the stirring condition to obtain a mixture; and (2) putting the mixture in a die; pressuring and smoothening the surface; and then, hardening at 15-110 DEG C for 0.2-24h to obtain a perlite composite insulation board. The perlite composite material of the invention adopts environment-friendly natural materials which are nontoxic, tasteless and taintless and have low production cost, low price and good insulation performance; and the insulation board has the advantages of light capacity weight, small conductive coefficient, good stability, strong strength, convenient construction, and the like.

Description

technical field [0001] The invention relates to a method for preparing a permanent refractory layer of a ladle, in particular to a method for preparing a permanent layer of a ladle lining by using a perlite composite heat insulation board. Background technique [0002] Modern steelmaking technology requires that the ladle is no longer a simple container for transportation and holding steel. The secondary refining and continuous casting of the ladle require the molten steel to stay in the ladle for a longer time and lower the temperature. This requires the use of more modern refractory materials for the ladle. To meet the stringent requirements of the process on the material. Generally, the permanent layer of ladle lining in steelmaking plants is integrally formed with castables or refractory materials such as carbon bricks. However, these refractory materials have a large thermal conductivity, which can easily lead to the following problems: 1. The temperature drop is fast....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 周建安熊永安李宝宽
Owner 湖北兴冶特钢实业发展有限公司
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