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Carbon-spinel magnesium fire-resistant castable wrapped with nano Al2O3 and MgO films and preparation method thereof

A refractory castable and film wrapping technology, which is applied in the field of refractory materials, can solve the problems of inability to implement integral casting, affect the production of steel casting, and cannot be carried out at the same time

Inactive Publication Date: 2012-06-27
高树森
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current actual situation is that the traditional resin-bonded magnesia-carbon brick masonry slag line is still widely used in the refining overall ladle slag line at home and abroad. The variety and quality of materials cannot meet the requirements for the use of the slag line, making it a key link in the overall pouring of the secondary refining ladle
At present, there are a series of serious problems in the refining ladle using magnesia-carbon bricks combined with organic resin to build the slag line: first, the use of magnesia-carbon bricks in the slag line cannot be poured as a whole, so that the advantages of the overall ladle cannot be fully utilized The second is that the service life of magnesia-carbon bricks used in the slag line is low, and the actual service life is between 25-40 heats, while the service life of the overall package bottom, package body and impact zone that are in direct contact with molten steel is 100- More than 120 heats, so the slag line is frequently shut down to replace the inner lining, which seriously affects the production of poured steel; the third is that the resin bonded magnesia carbon bricks for the ladle slag line and the bottom, body, and impact area of ​​the ladle are water-based There is a serious incompatibility between the combined castables, which is mainly reflected in the hydration of the magnesia-carbon bricks, so that it cannot be carried out simultaneously during the ladle baking process, and the actual operation is often to pour the bottom and the body first , and then the maintenance and baking of the castable, the masonry slag line is built, and it can be put into use after baking again, which brings considerable difficulties to the actual production operation. The new material required for refining is a key issue
Carbon has the advantages of not being easily wetted by molten steel and slag, low thermal expansion and high thermal conductivity, and will not soften after long-term use at high temperatures. However, there are still a series of problems with carbon in water-based castables , such as: the problem of poor wettability and dispersibility of carbon; the problem of oxidation at high temperature; Denaturation and water consumption have become major problems restricting the further development and application of carbon-containing castables
Until now, carbon-containing castables have not been mass-produced and practically used in steelmaking, so the research and development of carbon-containing castables has become a hot topic of great concern in the refractory industry at home and abroad.

Method used

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  • Carbon-spinel magnesium fire-resistant castable wrapped with nano Al2O3 and MgO films and preparation method thereof
  • Carbon-spinel magnesium fire-resistant castable wrapped with nano Al2O3 and MgO films and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] According to the present invention, be listed in the total reaction synthesis nano-Al of table 1 embodiment 1 2 o 3 Formula of carbon-spinel magnesia refractory castable with carbon powder wrapped in MgO film, add the mixture to the forced mixer for 1-2 minutes and dry mix it for 1-2 minutes, and then process the concentration of 58-61% after high-speed impact stirring The carbon-aluminum hydroxide mixed sol suspension is directly added to the mixture, and then wet mixed for 5 minutes. During the wet mixing process, 0-1% water is added according to the actual water demand of the mixture, and the mixture The active magnesium oxide powder and mixed water undergo hydration reaction at room temperature to generate magnesium hydroxide sol solution. These two composite sol suspensions are strongly adsorbed on the surface of the carbon powder through the combination and adsorption of the sol. A full-coverage, crack-free, and dense carbon coating is formed, and during the tran...

Embodiment 2

[0050]According to the non-total reaction synthesis (that is, adding part of the pre-synthesized spinel) carbon-spinel magnesia castable formula listed in Table 1 according to the present invention, the mixture is added to the forced mixer for dry mixing 1-2 minutes, then directly add the carbon-aluminum hydroxide composite sol suspension with a concentration of 58-61% treated by high-speed impact stirring into the mixture, and then wet-mix for 5 minutes. During the wet-mixing process, Add 0-1% water according to the actual water demand of the mixture, and make the active magnesium oxide powder in the mixture and the mixed water undergo hydration reaction at normal temperature to generate magnesium hydroxide sol, this composite sol suspension, Through the combination and adsorption of sol, it is strongly adsorbed on the surface of carbon, forming a full-coverage, crack-free, dense carbon coating. During the transformation process from sol to gel, nano-Al 2 o 3 and MgO gel par...

Embodiment 3

[0053] According to the present invention listed in the embodiment 3 of table 1 with nanometer Al 2 o 3 The carbon-spinel magnesia refractory castable formula wrapped with MgO film is mixed and stirred by a forced mixer, shaken by a vibrating table or a vibrating rod, and made into a prefabricated component of a certain size and single weight according to the actual situation. After air curing After 24 hours, bake in an electric heating oven at a temperature of 280°C for 80-120 hours, and then install the prefabricated components on the site of use (such as the slag line) in an assembled form. Compared with direct casting on site, this prefabricated structure has the following characteristics: first, it can better ensure the construction quality of castables; Third, the use of this prefabricated structure is conducive to the production of an anti-oxidation layer on the outer surface of the prefabricated components. The main technical performance indicators of the large-scale...

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Abstract

The invention relates to carbon-spinel magnesium fire-resistant castable wrapped with nano Al2O3 and MgO films and a preparation method thereof; the carbon-containing castable is a coating material taking Al(OH)3 and Mg(OH)2 sol suspension as carbon powder; a high-speed impact stirring device is used for conducting coating technique processing treatment so as to cause the Al(OH)3 to be strongly adsorbed on the surface of carbon; the manufacturing technique of coating aluminum hydrate sol liquid on carbon is realized; the carbon-containing sol liquid is directly added into a mixture and generates hydration with reactive magnesium oxide powder in substrate powder and mixed water so as to prepare Al(OH)3 and Mg(OH)2 composite sol suspension which serves as the coating material of carbon and aceramic binder of nano complex oxides of the carbon-containing castable; the transformation process from hydroxide sol to gel is controlled to prepare an aluminum oxide and magnesium oxide gel coating which is treated with synthesis in situ to form a carbon-containing nano structural substrate of nano secondary spinel and magnesium oxide and finally prepare the carbon-spinel magnesium fire-resistant castable.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a kind of nano Al 2 o 3 A carbon-spinel magnesia refractory castable wrapped in MgO film and a preparation method thereof. Background technique [0002] With the sharp increase in clean steel output, the application of secondary refining technology is becoming more and more common. In order to keep up with the pace of clean steel demand, secondary refining technology has been developed rapidly. Refractory materials keep up with the technological progress of the steel industry and provide Great progress has been made in providing the best service to the industry and satisfying the efficient operation of refining process equipment. In recent years, the main trend of the technical development of refractory materials is to continuously increase the use of integral refractory materials or unshaped refractory materials, especially the use of refractory castab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B41/85
Inventor 高树森
Owner 高树森
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