Nano Al2O3 and MgO composite ceramic bonded spinel-magnesia fireproof casting material and preparation method thereof

A technology for refractory castables and composite ceramics, applied in the field of refractory materials, can solve the problems of spalling, reduced service life of aluminum-spinel refractory castables, incompatibility, etc., and achieves low production costs, advanced and reasonable processing technology, and economical adaptable effect

Inactive Publication Date: 2009-09-30
高树森
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the increase of the secondary refining ratio, the load on the ladle lining is larger than before. The current situation is that with the increase of treatment time and temperature, and the high alkalinity of the treatment slag, the aluminum-spinel The service life of stone refractory castables is significantly reduced, which brings certain difficulties to the implementation and development of secondary refining technology
On the other hand, this aluminum-spinel castable itself has some defects in performance, the main reaction is that the resistance to slag erosion and slag penetration is relatively poor, so cracks, peeling, and falling off often occur in actual use. Blocks and other damage forms lead to a further reduction in service life and a situation that does not meet the requirements of secondary refining. Therefore, the secondary refining integral ladle lining increasingly requires new materials with high durability.
[0004] Nano-Al of the present invention 2 o 3 The main technical characteristics of the spinel-magnesia re

Method used

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  • Nano Al2O3 and MgO composite ceramic bonded spinel-magnesia fireproof casting material and preparation method thereof
  • Nano Al2O3 and MgO composite ceramic bonded spinel-magnesia fireproof casting material and preparation method thereof

Examples

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Embodiment 1

[0036] According to the fully synthesized reaction spinel-magnesia refractory castable formula of Example 1 listed in Table 1 according to the present invention, the prepared mixture is added to a forced mixer and mixed for 1-2 minutes, and then the prepared concentration Add 46-49% nano-composite hydroxide sol suspension binder directly into the mixture, then wet mix and stir for 5 minutes, and add 0-1% water according to the water requirement of the mixture to make the present invention Total reaction synthesis of nanocomposite oxide ceramic-bonded spinel-magnesia refractory castables. The main feature of this castable is that the aggregate part of the ingredients is all made of aluminum-rich or magnesium-rich synthetic spinel, and the matrix powder part is all made of magnesia and a small amount of alumina with different characteristics, and the secondary spinel and oxide Magnesium is used as the matrix phase of the nanostructure of the castable, and the difference in parti...

Embodiment 2

[0038] According to the reaction synthesis and pre-synthesis composite spinel-magnesia refractory castable formula listed in Example 2 of Table 1 according to the present invention, the prepared mixture is added to a forced mixer and mixed for 1-2 minutes, and then Add the prepared nano-composite hydroxide sol suspension binder with a concentration of 46-49% directly into the mixture, then wet mix and stir for 5 minutes, and add 0-1% water according to the water demand of the mixture , to make the composite nano-ceramic combined spinel-magnesia refractory castable of the present invention. The main feature of this castable is that the aggregate part is still all made of aluminum-rich or magnesium-rich synthetic spinel, and the matrix powder part is not only made of In addition to the synthesis reaction of magnesium oxide and alumina composite oxide, a certain amount of pre-reaction synthetic spinel is also added, which relatively reduces the content of secondary spinel synthesi...

Embodiment 3

[0040] According to the formula of reaction synthesis and pre-synthesis of spinel-magnesia castable in Example 3 listed in Table 1 according to the present invention, the prepared mixture is added to a forced mixer and mixed for 1-2 minutes, and then the prepared Concentration of 46-49% nano-composite hydroxide sol suspension binder is directly added to the mixture, then wet mixed and stirred for 5 minutes, and 0-1% of water is added according to the water demand of the mixture to make the cost Invented reactive synthesis and pre-synthesis of nano-composite oxide ceramics combined with spinel-magnesia refractory castables. The main feature of this castable is that the aggregate part of the ingredients is in the aluminum-rich spinel aggregate, and a certain amount of magnesia particles of different sizes ≤ 5mm are added; and a matrix similar to that of Example 2 is used in the matrix powder. Powder batching, to further increase the overall MgO content in the castable of the pre...

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Abstract

The invention relates to a nano Al2O3 and MgO composite oxide ceramic bonded spinel-magnesia fireproof casting material and a preparation method thereof. Al(OH)3 and Mg(OH)2 composite sol suspension is used as a nano ceramic bond, directly added into a mixture and subjected to in-situ synthesis reaction to form a nano structural matrix using spinel and magnesia as main components so as to form the nano spinel-magnesia fireproof casting material. The mixing materials of the casting material are characterized in that the spinel is used as aggregate or proper amount of sintered magnesia of less than or equal to 5 millimeters is added into the spinel aggregate to improve the total MgO content of the casting material; and the matrix material consists of a nano ceramic bond system, magnesia, little AlO3 with different properties and admixture, wherein after the synthesis reaction of the secondary spinel, the matrix material swells and is densified under constraint so as to cause the improvement of macrostructure and microstructure, improvement of performance and enhancement of durability and form the spinel-magnesia casting material with more excellent corrosion resistance and soakage resistance. The casting material is used in slag lines in integral secondary refining ladles, and obtains good using effect.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a nano-composite oxide ceramic bonded spinel-magnesia refractory castable for an integral ladle used in secondary refining of steelmaking. Background technique [0002] In recent years, the main trend in the development of refractory technology is to continuously increase the use of monolithic materials or unshaped refractory materials, especially refractory castables. The output of castable materials in many countries has exceeded more than half of the total output of refractory materials, especially in The use of castables in the Japanese iron and steel industry has reached 70%. "P303-309]. This is mainly due to the fast and easy mechanized furnace building and its more excellent performance and good use effect with shaped products. From the perspective of steelmaking and refining technology, the fundamental purpose of implementing the overall ladle i...

Claims

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Application Information

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IPC IPC(8): C04B35/66C21C7/00C04B35/10C04B35/443
Inventor 高树森
Owner 高树森
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