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Magnesium-zirconium-aluminum bricks used in vacuum degassing furnace, and preparation method thereof

A technology of vacuum degassing furnace and magnesia-zirconium-aluminum brick, which is applied in the field of refractory materials, can solve the problems of poor slag erosion resistance and penetration performance, and it is difficult to reach the service life of RH vacuum furnace, so as to improve spalling resistance and corrosion resistance. , the effect of reducing erosion

Active Publication Date: 2014-06-11
辽宁青花耐火材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has good thermal shock stability, and it can be used in the upper groove of the RH vacuum furnace. The main reason is that the upper groove of the RH furnace does not touch the molten steel, and the slag has less melting loss on the part, which can basically achieve ordinary direct bonding. The service life of magnesia-chrome bricks is long, but its slag erosion resistance and permeability are poor. During the use of the lower tank and dip tube where the melting loss is the most serious in the RH vacuum furnace, it is found that the melting loss is obvious, and it is difficult to reach the requirements of the RH vacuum furnace. service life

Method used

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  • Magnesium-zirconium-aluminum bricks used in vacuum degassing furnace, and preparation method thereof
  • Magnesium-zirconium-aluminum bricks used in vacuum degassing furnace, and preparation method thereof
  • Magnesium-zirconium-aluminum bricks used in vacuum degassing furnace, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A magnesium-zirconium-aluminum brick for a vacuum degassing furnace, comprising the following raw material components by weight:

[0029] 65 parts of magnesia pellets, of which: 20 parts of particle size > 3mm-5mm, 25 parts of particle size > 1mm-3mm, 20 parts of particle size > 0.074mm-1mm; fused magnesia fine powder particle size ≤ 0.074 mm 20 copies;

[0030] 6 parts of magnesia-aluminum spinel, of which: 5 parts with particle size > 0.033mm-1mm, 1 part with particle size ≤ 0.033mm;

[0031] Fused zirconia 9 parts, particle size ≤ 0.033mm; sulfite pulp waste liquid 3 parts.

[0032] Its preparation method is to add the above-mentioned raw material components into coarse particles first, then add sulfite pulp waste liquid, then add fine particles, fine powder and ultrafine powder in turn, then stir with a mixer, and finally extrude with a friction machine. It is fired in a high temperature tunnel kiln at -1830°C.

[0033] The performance of the magnesium-zirconium-...

Embodiment 2

[0037]A magnesium-zirconium-aluminum brick for a vacuum degassing furnace, comprising the following raw material components by weight:

[0038] 60 parts of magnesia granules, of which: 20 parts of particle size > 3mm-5mm, 25 parts of particle size > 1mm-3mm, 15 parts of particle size > 0.074mm-1mm; fused magnesia fine powder particle size ≤ 0.074 mm 22 parts;

[0039] 12 parts of magnesia-aluminum spinel, of which: 10 parts of particle size > 0.033mm-1mm, 2 parts of particle size ≤ 0.033mm;

[0040] Fused zirconia 7 parts, particle size ≤ 0.033mm; sulfite pulp waste liquid 2.5 parts.

[0041] Its preparation method is identical with embodiment 1.

[0042] The performance of the magnesium-zirconium-aluminum brick in embodiment 2 is as table 2:

[0043] Table 2

[0044]

Embodiment 3

[0046] A magnesium-zirconium-aluminum brick for a vacuum degassing furnace, comprising the following raw material components by weight:

[0047] 55 parts of magnesia pellets, of which: 15 parts of particle size > 3mm-5mm, 25 parts of particle size > 1mm-3mm, 15 parts of particle size > 0.074mm-1mm; fused magnesia fine powder particle size ≤ 0.074 mm 24 copies;

[0048] 18 parts of magnesia-aluminum spinel, of which: 15 parts with particle size > 0.033mm-1mm, 3 parts with particle size ≤ 0.033mm;

[0049] Fused zirconia 3 parts, particle size ≤ 0.033mm; sulfite pulp waste liquid 3.5 parts.

[0050] Its preparation method is identical with embodiment 1.

[0051] The performance of the magnesium-zirconium-aluminum brick of its embodiment 3 is shown in Table 3:

[0052] table 3

[0053]

[0054] The magnesium-zirconium-aluminum brick in the above-mentioned embodiment, the weight percent of its main chemical composition is: MgO 75-88%, ZrO 2 3-10%, Al 2 o 3 2-9%, and t...

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Abstract

The invention relates to the field of refractory materials, and especially relates to magnesium-zirconium-aluminum bricks used in a vacuum degassing furnace, and a preparation method thereof. The bricks are characterized in that the bricks comprise the raw materials, by weight: magnesia pellets, fused magnesia fine powder, magnesium aluminate spinel, and fused zirconia. Main chemical components of the bricks are MgO, ZrO2, and Al2O3. Compared with prior arts, the bricks and the preparation method provided by the invention have the advantages that: on a basis of a magnesia refractory material, ZrO2 and magnesium aluminate spinel are introduced, such that the following effects are provided: (1) ZrO2 can isolate low-melting phases such as CaO and SiO2 in a liquid phase, such that corrosion resistance of the magnesia refractory material is improved; (2) ZrO2 is subjected to crystal form conversion in the refractory material, such that thermal shock resistance of the magnesia material is improved; (3) with the addition of magnesium aluminate spinel, anti-stripping performance of the magnesia refractory material is improved; and (4) proper magnesium aluminate spinel ultrafine powder is added, such that a substrate can be enhanced, and corrosion resistance of the magnesia refractory material is improved.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a magnesium-zirconium-aluminum brick for a vacuum degassing furnace and a preparation method thereof. Background technique [0002] In recent years, with the continuous development of steelmaking technology, vacuum degassing furnace refining method has become an indispensable means in modern steelmaking technology, RH method, DH method, AOD method, VOD method, LF-VD method in the refining It is widely used in the secondary refining process of steel. With the continuous development of high-quality steel, the application technology of basic refractories used in vacuum degassing furnaces has attracted more and more attention from the industry. There is no doubt that the quality of refractory materials will directly affect vacuum degassing. The rhythm of the furnace and the cost of steelmaking. [0003] During the vacuum degassing process, the refractory material directly contac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 潘波周科研高心魁
Owner 辽宁青花耐火材料股份有限公司