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Microporous corundum preparation method

A corundum and microporous technology, which is applied in the field of microporous corundum preparation, can solve the problems of reduced corrosion resistance, low strength, and difficulty in use, and achieves the effects of simple preparation method, good thermal shock resistance, and high refractoriness

Inactive Publication Date: 2019-12-06
JIANGSU JINGXIN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, the pursuit of dense and high-strength refractory materials can improve the erosion resistance and erosion resistance of the ladle lining to a certain extent, but it is not good for thermal shock resistance. Among the damage methods of refractory materials, thermal spalling has a greater impact on the service life of refractory materials. Big
[0003] Microporosity of refractory materials is the development trend in the field of refractory material technology today. Its purpose is to reduce the thermal conductivity and Structural thermal stress, improve the thermal shock resistance of materials and have certain thermal insulation properties, especially for working linings can reduce heat loss of thermal equipment, reduce energy consumption, and thus help to achieve longevity and high efficiency and integration of energy saving and consumption reduction; although the current Lightweight refractory materials have good energy-saving effects, but due to their low strength, they cannot resist erosion and erosion. They are mostly used in non-working layers, and it is difficult to use them in working layers that are directly in contact with high-temperature melts, such as ladle linings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A microporous corundum and a preparation method thereof. The raw materials and mass percentages of the microporous corundum are: 70-100% industrial alumina, 0-10% aluminum hydroxide, 0-20% α-alumina, 0-30% γ-alumina, and Add 0~2% polyvinyl alcohol as a sintering aid.

[0023] The mixed powder is ground in a ball mill for 1-5 hours, and the powder is formed into balls in the ball forming machine. The ball forming binder is 0-6% polyvinyl alcohol aqueous solution, and the diameter of the ball blank is 20-30mm. After drying in the drying tower It is sintered at 1700~1950℃ for 1~5h in a shaft kiln, and the finished product of microporous corundum can be obtained after the fired pellets are crushed.

Embodiment 2

[0025] A microporous corundum and a preparation method thereof. The raw materials and mass percentages of the microporous corundum are: 60-100% industrial alumina, 0-10% aluminum hydroxide, 0-20% α-alumina, and 0-3% polyvinyl alcohol as a sintering aid.

[0026] The mixed powder is ground in a ball mill for 1-5 hours, and the powder is formed into balls in the ball forming machine. The ball forming binder is 0-3% polyvinyl alcohol aqueous solution, and the diameter of the ball blank is 20-30mm. After drying in the drying tower It is sintered at 1700~1950℃ for 1~5h in a shaft kiln, and the finished product of microporous corundum can be obtained after the fired pellets are crushed.

Embodiment 3

[0028] A microporous corundum and a preparation method thereof. The raw materials and mass percentages of the microporous corundum are: 80-100% industrial alumina, 0-10% aluminum hydroxide, 0-10% γ-alumina, and 0-1% polyvinyl alcohol as a sintering aid.

[0029] The mixed powder is ground in a ball mill for 1-5 hours, and the powder is formed into balls in the ball forming machine. The ball-forming agent is 0-10% polyvinyl alcohol aqueous solution, and the diameter of the ball is 20-30mm. After drying in the drying tower It is sintered at 1700~1950℃ for 1~5h in a shaft kiln, and the finished product of microporous corundum can be obtained after the fired pellets are crushed.

[0030] In the blank making process of the present invention, the mold used to limit the size of corundum adopts the following structural form: the mold includes an inner layer and an outer layer, an interlayer is formed between the inner layer and the outer layer, and the inner layer forms cavity;

[...

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Abstract

The invention discloses a microporous corundum preparation method, which comprises: mixing and grinding multiple raw materials into powder with a certain fineness, preparing a billet, and sintering the billet at a temperature of 1700-1950 DEG C to obtain the microporous corundum, wherein the raw materials comprise, by mass, 60-100% of industrial aluminum oxide, 0-20% of alpha-aluminum oxide, 0-30%of gamma-aluminum oxide, 0-10% of aluminum hydroxide, and 0-3% of polyvinyl alcohol. According to the present invention, the preparation method is simple, and is suitable for industrial production; and the product is mainly characterized in that the corundum crystal contains a large number of sub-micron and nano-scale closed gas pores, and have characteristics of low thermal conductivity, good thermal shock resistance, good slag corrosion resistance, energy saving, thermal insulation and high refractoriness, and can replace sintered corundum.

Description

technical field [0001] The invention belongs to the technical field of corundum refractory materials, and in particular relates to a preparation method of microporous corundum. Background technique [0002] With the development of steelmaking technology, the ladle has changed from a single-function molten steel container to a complex-function refining equipment outside the furnace. The refractory lining not only has to withstand high temperatures, but also needs to resist the erosion of molten steel and slag. and erosion. For a long time, the pursuit of dense and high-strength refractory materials can improve the erosion resistance and erosion resistance of the ladle lining to a certain extent, but it is not good for thermal shock resistance. Among the damage methods of refractory materials, thermal spalling has a greater impact on the service life of refractory materials. big. [0003] Microporosity of refractory materials is the development trend in the field of refracto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/101C04B38/00C04B35/634
CPCC04B35/101C04B35/63416C04B38/0054C04B2235/9607C04B38/0074
Inventor 何健吕戌生张嘉良张家勤
Owner JIANGSU JINGXIN NEW MATERIAL
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