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Method for processing sols of alumina refractory particles

A technology of refractory material and treatment method, which is applied in the treatment of high-aluminum refractory material particles and the field of sol treatment of aluminum refractory material particles, can solve the problem of low temperature coating of refractory material particles and low temperature treatment process without mentioning precursors. problems, to achieve the effect of promoting sintering, solving the bottleneck of agglomeration, and reducing the sintering temperature

Inactive Publication Date: 2010-12-15
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In the paper "Role of nanocrystalline spinel additive on the properties of lowcement castable refractories" in "Materials and Manufacturing Processes", India S.Mukhopadhyay et al. proposed that spinel nanopowder prepared by sol-gel method, to spinel The amount of castable added is 8.0wt.%. It is considered that nanoparticles act as a binder in the matrix. The castable used as tundish ladle lining shows good thermal shock stability and slag resistance, and does not improve Low-temperature coating of refractory particles to precursors and low-temperature treatment process

Method used

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  • Method for processing sols of alumina refractory particles
  • Method for processing sols of alumina refractory particles
  • Method for processing sols of alumina refractory particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, comprises the steps:

[0027] The first step is to configure the precursor Al-Mg sol.

[0028] Using aluminum nitrate as aluminum source, magnesium citrate as magnesium source, according to magnesium aluminum spinel MgAl 2 o 4 In a chemical formula with a ratio of aluminum to magnesium of 2, a mixed sol of nitrate and citrate aluminum-magnesium precursors with a molar concentration of 0.5M was prepared.

[0029] In the second step, the aluminum refractory particles, such as sintered magnesia-aluminum spinel particles, are immersed in the nitrate and citrate aluminum-magnesium precursor sol for 5 minutes, and then taken out and sieved to make the impregnating solution and the particles separate. The aluminum refractory material adopts sintered magnesia-aluminum spinel or fused magnesia-aluminum spinel or sintered corundum or fused corundum.

[0030] The third step is to carry out low-temperature treatment on the impregnated aluminum refractory particles...

Embodiment 2

[0031] Embodiment 2, comprises the steps:

[0032] In the first step, aluminum nitrate is used as aluminum source, magnesium citrate is used as magnesium source, according to magnesium aluminum spinel MgAl 2 o 4 In a chemical formula with a ratio of aluminum to magnesium of 2, a mixed sol of nitrate and citrate aluminum-magnesium precursors with a molar concentration of 2M is prepared.

[0033] In the second step, the aluminum refractory particles, such as fused magnesia-aluminum spinel particles, are immersed in the mixed sol of nitrate and citrate aluminum-magnesium precursors for 10 minutes, and then taken out and sieved to make the impregnation solution and the particles separate.

[0034] The third step is to perform low-temperature treatment on the impregnated aluminum refractory particles, that is, place the sieved particles in a sagger for 3 hours at 1000°C, and react and synthesize on the aluminum refractory particles to obtain nano-magnesium-aluminum tips The spar...

Embodiment 3

[0035] Embodiment 3, comprises the steps:

[0036] In the first step, aluminum nitrate is used as aluminum source, magnesium citrate is used as magnesium source, and magnesium aluminum spinel MgAl 2 o 4 In a chemical formula with a ratio of aluminum to magnesium of 2, a mixed sol of nitrate and citrate aluminum-magnesium precursors with a molar concentration of 1M was prepared.

[0037] In the second step, aluminum refractory particles, such as sintered corundum particles, are immersed in the mixed sol of nitrate and citrate aluminum-magnesium precursors for 8 minutes, and then taken out and sieved to separate the impregnation solution from the particles.

[0038] The third step is to perform low-temperature treatment on the impregnated sintered corundum particles, that is, place the sieved particles in a sagger for 1 hour at 1200°C, and synthesize them on the aluminum refractory particles to obtain nano-magnesium-aluminum spinel powder , the raw material of sintered corundu...

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Abstract

The invention discloses a method for processing sols of alumina refractory particles, which mainly aims to solve the problem of agglomeration of nano-powder during use in the prior art. The method comprises the following steps of: preparing magnalium precursor sols with a molar concentration of 0.5 to 2M from aluminium nitrate serving as an aluminum source, and magnesium oxalate or gnesium citrate serving as a magnesium source according to a mole ratio of Al to Mg of 2; putting the particles of aggregate particles of the alumina refractory material into an anti-acid container, and then pouring the magnalium precursor sols with a molar concentration of 0.5 to 2M into the container to soak for 5 to 10 minutes; after filtering the obtained objects by using a screen, putting the obtained particles into a sagger, and then carrying out thermal treatment on the obtained particles at the temperature of between 600 and 1,200 DEG C for 1 to 6 hours, and reacting the aluminosilicate refractory particles to synthesize nano magnesia-alumina spinel powder, and then obtain the aluminosilicate refractory particles attached with the nano magnesia-alumina spinel powder. The method of the invention has the advantage of uniformly-distributed nano-particles in the alumina refractory material can be used for processing refractory raw materials and improves the sintering process of the refractory raw materials.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to the processing of aluminum refractory materials, in particular to a sol processing method for aluminum refractory particles, which is suitable for processing high-alumina refractory particle raw materials. Background technique [0002] Nanomaterials have a large specific surface due to their small particle size, so that nanomaterials exhibit singular small size effects, specific surface effects and extraordinary surface activity. In recent years, although people have prepared many refractory oxides by experimental methods, such as sol-gel method, vacuum freeze-drying method, etc., in practical applications, the remarkable activity of nanoparticles and the problem of agglomeration have become nanopowder in refractory. The bottleneck in the application of materials restricts the application of nanomaterials in refractory materials. There are many synthesis methods of nano-magnesium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B41/85
Inventor 张显郝富锁
Owner XIDIAN UNIV
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