Nano Al2O3 film encapsulated carbon-aluminum spinelle refractory castable and preparation method thereof

A technology of aluminum spinel and film wrapping, applied in the field of refractory materials, can solve the problems of deformation service life of ladle furnace shell, thermodynamic instability, increase of heat loss rate, etc.

Inactive Publication Date: 2009-04-29
高树森
View PDF0 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, some problems have arisen in the use of magnesia-carbon bricks in the steelmaking process: the high thermal conductivity of phosphorus flake graphite causes the heat insulation effect to decrease, resulting in an increase in heat loss rate, resulting in deformation of the ladle furnace shell and a reduction in service life; Carbon in magnesia-carbon bricks will enter molten steel and cause carbonization of molten steel, especially after the secondary refining of molten steel, which will seriously affect the quality of molten steel. Therefore, the steel industry strongly requires reducing the carbon content in magnesia-carbon bricks. For this reason, researchers are working on Focus on the development of new magnesia carbon bricks with a carbon content of less than 5%
However, in the production and application of carbon-containing castables, there are still a series of problems, such as: the problem of poor wettability and dispersibility of carbon; the selection of carbon source and efficient antioxidant; the problem of oxidation at high temperature; the problem of oxidation The relationship between carbon and carbon is thermodynamically unstable, resulting in oxidation-reduction reactions that lead to deterioration of the organizational structure; problems such as the hydrophilicity, rheology, and water consumption of carbon have become restrictions on the further development of carbon-containing castables. and application of major problems
Therefore, until now, carbon-containing castables have not been industrialized and used in secondary refining, so how to solve these problems and develop nano-AL 2 o 3 Film-wrapped carbon-aluminum spinel refractory castable is a key issue in the development of secondary refining technology for steelmaking

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Nano Al2O3 film encapsulated carbon-aluminum spinelle refractory castable and preparation method thereof
  • Nano Al2O3 film encapsulated carbon-aluminum spinelle refractory castable and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Listed in the reaction synthesis nanometer AL of table 1 embodiment 1 according to the present invention 2 o 3 The film-wrapped carbon-aluminum spinel castable formula, the mixture is added to the forced mixer for 1-2 minutes of dry mixing, and then the nano-carbon with a concentration of 58-61% is processed by high-speed impact stirring for solification and dispersion - Aluminum hydroxide composite sol suspension is directly added to the mixture, and then wet mixed for 5 minutes. During the mixing process, 0-1% of water is added according to the actual water demand of the mixture to make the reaction synthesis method of the present invention nano-AL 2 o 3 Film-wrapped carbon-aluminum spinel castables. The main technical performance indicators of the castable in this example are listed in Table 2. Its biggest features are: dense structure, low porosity, high compressive and flexural strength, and excellent slag erosion resistance and slag penetration resistance, suit...

Embodiment 2

[0032]According to the present invention listed in Table 1 Example 2 pre-synthesized carbon-aluminum spinel castable formula, add the mixture and dry mix it in a forced mixer for 1-2 minutes, then carry out solization and dispersion treatment through high-speed impact stirring The carbon-aluminum hydroxide composite sol suspension with a concentration of 58-61% is directly added to the mixture, and then wet mixed for 5 minutes. During the mixing process, 0-1% of water is added according to the actual moisture content of the mixture to make the present invention Pre-synthesized nano-AL 2 o 3 Film-wrapped carbon-aluminum spinel refractory castable. The main technical performance indicators of the castable in this example are listed in Table 2. Its biggest feature is its excellent thermal shock resistance and high temperature structural stability, and it is not easy to crack and peel off in actual use. It is suitable for use at the bottom of the LF refining furnace. .

Embodiment 3

[0034] Example 3 Nano AL listed in Table 1 according to the present invention 2 o 3 The film-wrapped carbon-aluminum spinel castable formula is mixed and stirred by a mixer, and vibrated by a vibrating table or a vibrating rod to form a large prefabricated component with a size of 1120 / 1200×670×460 cm and a unit weight of 1100kg. Air curing 24 hours, baking in an electric heating oven, baking temperature: 280 ° C, baking time: 120 hours. Then the large prefabricated components are placed in the impact area of ​​the refining ladle, and then the bottom of the refining ladle is integrally poured. The biggest feature of using prefabricated large-scale components in the impact area is that it has strong impact resistance to molten steel and significantly improved service life. Compared with the on-site integral pouring structure in the impact area, its service life can be increased by more than 50-80%. In addition, it is also Advantageous conditions are provided for the integral ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
flexural strengthaaaaaaaaaa
densityaaaaaaaaaa
Login to view more

Abstract

The invention relates to a carbon-aluminum spinel refractory castable material wrapped up by a nano AL2O3 film and a preparation method thereof. The preparation method of the carbon containing castable material firstly puts the mixture of hydrated alumina, carbon powders and water in a high speed impact mixing-stirring mill for coating processing treatment, the materials impact and collide with each other after high-speed impact treatment, thus forming a composite sol suspension liquid of carbon and aluminum hydroxide and causing the aluminum hydroxide to be strongly absorbed on the surface of the carbon, therefore, the manufacture technology for coating carbon powders by using aluminum hydroxide is realized, then the composite sol suspension liquid is directly added to the mixed materials for preparing alumina gel coatings by controlling the conversion process from the aluminum hydroxide to the gel, and hence the whole-covered, crack-free and high-strength compact alumina wrapping layer is formed; and during the mixing and stirring process of the castable material, magnesium hydroxide sols are generated by the hydration reaction of magnesia powders and mixed water in matrix powders, then the nanostructure matrix of carbon-aluminum-spinel is generated by the in-situ synthesized reaction of the magnesium hydroxide sol and aluminum hydroxide sol suspension liquid, and finally the carbon-aluminum refractory castable material is prepared.

Description

[technical field] [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a carbon-aluminum spinel refractory castable which is wrapped with a nano-alumina film in an integral ladle for secondary refining of steelmaking and a preparation method thereof. [Background technique] [0002] With the increase of clean steel output, the application of secondary refining technology is becoming more and more common. In order to keep up with the development of clean steel, secondary refining technology has been developed rapidly. The LF refining method outside the furnace is a refining method that is widely used at home and abroad at present. The lining material of the ladle is made of magnesia-carbon bricks or aluminum-magnesia-carbon bricks, which is a relatively common form of refining ladles. Magnesia-carbon bricks using phosphorus-containing flake graphite are a kind of refractory material with excellent performance and are widely ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 高树森
Owner 高树森
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap