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Aluminum-based binder for sintering high-alumina bricks and preparation method thereof

An aluminum-based binder and high-alumina brick technology, which is applied in the field of inorganic chemical industry, can solve the problems of increased silicon porosity, reduced strength, and reduced heat and corrosion resistance of products, and achieves improved compressive strength at room temperature and softening under load Increased temperature and improved thermal shock resistance

Active Publication Date: 2020-06-05
鞍山腾泰耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But free SiO in clay 2 and free Al in high alumina bauxite clinker 2 o 3 A secondary mullite reaction occurs at 1200°C, resulting in a large volume expansion, an increase in the porosity of silicon, and a decrease in strength
If organic substances are used as the binder of high alumina bricks, although the organic substances have good cohesiveness and will volatilize after firing without introducing impurities, the organic binder itself is not suitable for preservation, and the organic binder will volatilize and be poisonous after high temperature Gas, causing harm to the human body, at the same time, the organic binder leaves pores after burning, a large number of pores affect the compactness of the product, thereby reducing the heat resistance and corrosion resistance of the product

Method used

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  • Aluminum-based binder for sintering high-alumina bricks and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Crush 3.5kg of bauxite to a particle size of 100-200 mesh, place it in a reaction kettle at 300°C and react with 1.5kg of concentrated sulfuric acid for 30 minutes, let it stand still, add concentrated sulfuric acid to the supernatant until pH = 8, and place it at 115°C Cool down and crystallize to obtain a crystal product; put the above crystal product and 5.7kg of aluminum hydroxide in a jaw crusher, and crush it into a fine powder material with a particle size of 100-200 mesh; add 0.2 kg of aluminum fluoride to the above fine powder material and 0.1kg of aluminum chloride, and put them together in an aluminum grinding wet mill for premixing for 20 minutes to obtain a premixed material; put the premixed material in a ball mill and ball mill for 3 hours to obtain a sintered high-alumina brick for aluminum-based bonding agent.

[0020] Using the aluminum-based binder to prepare high-alumina refractory bricks, the steps are as follows: 1) 45 parts of bauxite aggregates w...

Embodiment 2

[0023] Crush 4.0kg of bauxite to a particle size of 100-200 mesh, place it in a 300°C reactor and react with 1.0kg of concentrated sulfuric acid for 30min, let it stand, add concentrated sulfuric acid dropwise to the supernatant to pH = 8, and place it at 115°C Cool down and crystallize to obtain a crystal product; put the above crystal product and 5.8kg of aluminum hydroxide in a jaw crusher, and crush it into a fine powder material with a particle size of 100-200 mesh; add 0.1 kg of aluminum fluoride to the above fine powder material and 0.1kg of aluminum chloride, and put them together in an aluminum grinding wet mill for premixing for 20 minutes to obtain a premixed material; put the premixed material in a ball mill and ball mill for 3 hours to obtain a sintered high-alumina brick for aluminum-based bonding agent.

[0024] The aluminum-based binder is used to prepare high-alumina refractory bricks, and the steps are the same as in Example 1.

[0025] The density of high a...

Embodiment 3

[0027] Crush 3.9kg of bauxite to a particle size of 100-200 mesh, place it in a 300°C reactor and react with 1.1kg of concentrated sulfuric acid for 30 minutes, let it stand, add concentrated sulfuric acid dropwise to the supernatant to pH = 8, and place it at 115°C Cool down and crystallize to obtain a crystal product; put the above crystal product and 5.6kg of aluminum hydroxide in a jaw crusher, and crush it into a fine powder material with a particle size of 100-200mm; add 0.2kg of aluminum fluoride to the above fine powder material and 0.2kg of aluminum chloride, and put them together in an aluminum grinding wet mill for premixing for 20 minutes to obtain a premixed material; put the premixed material in a ball mill and ball mill for 3 hours to obtain a sintered high alumina brick bonded with an aluminum matrix agent.

[0028] The aluminum-based binder is used to prepare high-alumina refractory bricks, and the steps are the same as in Example 1.

[0029] The density of h...

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Abstract

The invention relates to an aluminum-based binder for sintering high-alumina bricks and a preparation method thereof. The aluminum-based binder is prepared from bauxite, sulfuric acid, aluminum hydroxide, aluminum fluoride and aluminum chloride. The bauxite is crushed and then placed in a reaction kettle to react with sulfuric acid; standing is carried out, and sulfuric acid is added into the supernate, wherein the pH value of the sulfuric acid is 7-10; aluminum hydroxide, aluminum fluoride and aluminum chloride are mixed, cooling and crystallizing are carried out to obtain a crystal product,and steps of crushing, premixing and ball-milling are carried out on the crystal product, aluminum hydroxide, aluminum fluoride and aluminum chloride to obtain the aluminum-based binder, and the binder effectively enhances the density, refractoriness, thermal shock resistance, refractoriness under load and other properties of the high-alumina refractory bricks.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical industry, in particular to an aluminum-based binder for sintered high-alumina bricks and a preparation method thereof. Background technique [0002] High-alumina bricks are high-grade refractory materials, which have higher refractoriness than clay bricks and semi-silica bricks. At the same time, they have good load softening temperature, thermal conductivity and thermal shock resistance. The choice of binder is still a major bottleneck affecting the performance of high alumina bricks. [0003] Soft clay has better plasticity, therefore, soft clay is usually used as binder in the manufacture of high alumina bricks. But free SiO in clay 2 and free Al in high alumina bauxite clinker 2 o 3 A secondary mullite reaction occurs at 1200°C, resulting in a large volume expansion, an increase in the porosity of silicon, and a decrease in strength. If organic substances are used as the binder...

Claims

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Application Information

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IPC IPC(8): C04B35/63C04B35/101
CPCC04B35/6303C04B35/101C04B2235/3218C04B2235/445C04B2235/444C04B2235/6562C04B2235/77C04B2235/96C04B2235/9607
Inventor 李春光罗旭东李季佳
Owner 鞍山腾泰耐火材料有限公司
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