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Magnesium aluminate spinel brick with excellent comprehensive performance and moderate price and preparation method thereof

A magnesia-aluminum spinel brick and magnesia-aluminum spinel technology, which is applied in the field of refractory materials and can solve the problem of weakening the softening temperature and thermal shock stability of magnesia-alumina spinel bricks, low thermal strength at high temperature, and thermal shock stability. It can improve the anti-oxidation and high-temperature enhancement effect, improve the high-temperature performance, and improve the high-temperature oxidation resistance.

Inactive Publication Date: 2021-08-06
海城利尔麦格西塔材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing magnesia-aluminum spinel bricks often have defects such as high preparation cost, low high-temperature thermal strength, and poor thermal shock stability.
Although some performance defects of the material can be made up for through technical improvement: for example, the strength of the material can be improved by introducing additives to promote sintering and densification, but the introduction of additives leads to the formation of high-temperature liquid phase of the material, which weakens the magnesia-aluminum spinel brick. The load softening temperature and thermal shock stability; for example, the introduction of carbon-containing or other non-oxide additives can promote densification and improve the thermal shock stability and strength of the product, but the magnesium-aluminum tip prepared by this method Spar bricks are not suitable for use in neutral / oxidative atmosphere conditions, and the presence of non-oxide components makes the structure and performance of the working lining rapidly decline with the prolongation of working time

Method used

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  • Magnesium aluminate spinel brick with excellent comprehensive performance and moderate price and preparation method thereof
  • Magnesium aluminate spinel brick with excellent comprehensive performance and moderate price and preparation method thereof
  • Magnesium aluminate spinel brick with excellent comprehensive performance and moderate price and preparation method thereof

Examples

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preparation example Construction

[0040] A method for preparing magnesia-aluminum spinel bricks with excellent comprehensive performance and moderate price, specifically includes the following steps:

[0041] 1) crush the fused magnesia, then sieve to obtain three kinds of magnesia particles whose particle size is 5~3mm, 3~1mm and <1mm;

[0042] 2) Finely grind the crushed and sieved magnesia particles into magnesia fine powder with particle size≤0.088mm;

[0043] 3) Mix the antioxidant, magnesia-aluminum spinel, nano-zinc oxide, and magnesia fine powder together to make a mixed powder;

[0044] 4) After measuring the magnesia particles of different particle sizes according to the ratio requirements, add the magnesia particles, the above-mentioned mixed powder, and natural flake graphite into the high-speed mixer in this order for 1-2 minutes of low-speed mixing , add phenolic resin and mix at low speed for 1 to 2 minutes to make mud;

[0045] 5) Add metal fibers to the mud in the high-speed mixer, and mix a...

Embodiment

[0049] The following 5 examples are listed as specific descriptions of the raw materials used in the specific embodiments of the present invention, and the specific contents are shown in Table 1.

[0050] Table 1: Example 1 to Example 5, a list of ingredients for a magnesia-alumina spinel brick with excellent comprehensive performance and moderate price (unit: weight percentage content %)

[0051] raw material Example 1 Example 2 Example 3 Example 4 Example 5 Magnesia particles 1 ~ 5mm 25 30 35 40 50 Magnesia particles 10 15 15 15 20 Magnesia fine powder≤0.088mm 5 7 8 10 20 Nano ZnO 2 3 4 5 6 Natural flake graphite≤0.15mm 1 2 2 2 3 Phenolic Resin 1.5 2 2 2 2 metal fiber 0.5 1 1 1 1 Antioxidant ≤0.088mm 1 1 1.5 1 1 Magnesium aluminum spinel 1 ~ 2mm 10 15 30 20 35

[0052] The nano zinc oxide used in the invention has very high specific surface area and reactivity. Z...

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Abstract

The invention relates to the technical field of refractory materials, in particular to a magnesium aluminate spinel brick with excellent comprehensive performance and moderate price and a preparation method of the magnesium aluminate spinel brick. The comprisesthe following raw materials in percentage by weight: 35-70% of magnesia particles; 5%-30% of magnesia fine powder; 10%-55% of magnesium aluminate spinel; 2%-6% of nano zinc oxide; 1.5%-4.5% of phenolic resin; 1%-6% of natural crystalline flake graphite; 0.1%-5% of metal fibers; and 1%-5% of an antioxidant. The high-temperature thermal strength is high, the thermal shock resistance is high, the comprehensive performance is excellent, and the price is moderate.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a magnesium-aluminum spinel brick with excellent comprehensive performance and moderate price and a preparation method thereof. Background technique [0002] The magnesia-alumina spinel brick is based on magnesia-alumina spinel. The magnesia-alumina brick has good thermal shock stability and can withstand water cooling for 20-25 times, or even higher. This is its most prominent advantage, which is better than ordinary magnesia bricks. much. According to the study, the thermal shock stability of magnesia-alumina bricks is good because magnesia-alumina spinel and periclase belong to the cubic crystal system, and the thermal expansion along each crystal axis direction is the same, so the expansion and contraction are relatively uniform when the temperature fluctuates. Generates less thermal stress. The main performance of magnesia-alumina bricks is also slightly stron...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/443
CPCC04B35/66C04B35/443C04B2235/3206C04B2235/3284C04B2235/425C04B2235/5216C04B2235/402C04B2235/428C04B2235/3826C04B2235/9607
Inventor 张义先赵现华侯中阳金钊
Owner 海城利尔麦格西塔材料有限公司