Alumina hollow ball brick and preparation method thereof

A technology of alumina hollow balls and hollow ball bricks, which is applied in the field of refractory materials, can solve the problems of affecting service life, poor thermal shock stability, and low strength, so as to save fuel consumption, improve thermal shock performance and strength, and improve thermal shock The effect of stability

Inactive Publication Date: 2019-11-08
郑州明珠实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the existing alumina hollow ball bricks are used, due to their low strength and poor thermal shock stability, defects such as cracks and peeling will occur during use, which will affect the service life.

Method used

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  • Alumina hollow ball brick and preparation method thereof
  • Alumina hollow ball brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: The alumina hollow ball brick of this embodiment is made of the following raw materials in parts by weight: 40 parts of alumina hollow balls, 15 parts of white corundum fine powder, 7 parts of silicon carbide, 14 parts of alumina fine powder, blue 3 parts of spar powder, 3 parts of sillimanite powder, 5 parts of clay, 10 parts of binder

[0020] Among them, the particle size of alumina hollow spheres is ≤4mm, the particle size of white corundum fine powder is ≤150 mesh, the particle size of silicon carbide is ≤200 mesh, the particle size of alumina fine powder is ≤500 mesh, and the particle size of kyanite fine powder is ≤500 mesh , the particle size of sillimanite powder is ≤500 mesh, and the particle size of clay is ≤200 mesh.

[0021] The preparation method of the present embodiment comprises the following steps:

[0022] (1) Mix white corundum fine powder, alumina fine powder, kyanite fine powder, sillimanite fine powder and clay in a mixing device (s...

Embodiment 2

[0026] Embodiment 2: The alumina hollow ball brick of this embodiment is made of the following raw materials in parts by weight: 30 parts of alumina hollow balls, 20 parts of white corundum fine powder, 5 parts of silicon carbide, 16 parts of alumina fine powder, blue 2 parts of spar micropowder, 4 parts of sillimanite micropowder, 4 parts of clay, 12 parts of binder, and the binder is pulp. The particle size of each raw material is the same as in Example 1.

[0027] The preparation method of the present embodiment comprises the following steps:

[0028] (1) Mix white corundum fine powder, alumina fine powder, kyanite fine powder, sillimanite fine powder and clay in a mixing device (spiral mixer) to obtain a mixed powder for later use;

[0029] (2) Mix alumina hollow spheres, silicon carbide and mixed powder in a mixing device (star mixer) for 4 minutes, then add binder and mix for 8 minutes to form mud;

[0030] (3) Vibrating the mud in the forming equipment to form bricks;...

Embodiment 3

[0032] Embodiment 3: The alumina hollow ball brick of this embodiment is made of the following raw materials in parts by weight: 50 parts of alumina hollow balls, 8 parts of white corundum fine powder, 10 parts of silicon carbide, 8 parts of alumina fine powder, blue 4 parts of spar micropowder, 2 parts of sillimanite micropowder, 7 parts of clay, and 8 parts of binder. The binder is pulp and aluminum sulfate, and the mass ratio of pulp and aluminum sulfate is 1:1.

[0033] The preparation method of the present embodiment comprises the following steps:

[0034] (1) Mix white corundum fine powder, alumina fine powder, kyanite fine powder, sillimanite fine powder and clay in a mixing device (spiral mixer) to obtain a mixed powder for later use;

[0035] (2) Mix alumina hollow spheres, silicon carbide and mixed powder in a mixing device (star mixer) for 3 minutes, then add binder and mix for 10 minutes to form mud;

[0036] (3) Vibrating the mud in the forming equipment to form ...

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Abstract

The invention provides an alumina hollow ball brick and a preparation method thereof. The alumina hollow ball brick is prepared from the following raw materials by weight: 30-50 parts of alumina hollow balls with particle sizes of no less than 4 mm, 8-20 parts of fine white corundum powder with a particle size of no less than 150 meshes, 5-10 parts of silicon carbide with particle size of no lessthan 200 meshes, 8-16 parts of alumina micropowder with a particle size of no less than 500 meshes, 2-4 parts of kyanite micropowder with a particle size of no less than 500 meshes, 2-4 parts of sillimanite micropowder with a particle size of no less than 500 meshes, 4-7 parts of clay micropowder with a particle size of no less than 200 meshes and 8-12 parts of a binder. The alumina hollow ball brick of the invention has the characteristics of high temperature resistance, high strength, good thermal shock resistance, fuel economy and the like, and is particularly applicable to high-temperatureroller bar sintering kilns and kilns with similar working conditions; and the preparation method is simple in process and easy to implement, and has wide application and promotion value.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to an alumina hollow ball brick and a preparation method thereof. Background technique [0002] There are two types of high temperature roller sintering kilns: pit kiln and shuttle kiln. Regardless of the furnace type, the kiln is characterized by large volume, especially high height, frequent heating and cooling, and high firing temperature. The operating temperature of this kiln is between 1500°C and 1600°C, and every 2-3 days is a firing cycle. Therefore, the lining material is required to have properties such as high temperature resistance, high strength, good thermal shock stability, and fuel saving. [0003] Alumina hollow ball bricks have good refractory performance and excellent heat insulation performance. They are often used as the working lining of this kind of high-temperature kiln, which can reduce heat loss, speed up the heating rate, thereby reducing en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/103C04B35/622
CPCC04B35/103C04B35/622C04B2235/3463C04B2235/349C04B2235/3826C04B2235/528C04B2235/5427C04B2235/5436C04B2235/656C04B2235/6567C04B2235/77C04B2235/9607
Inventor 朱惯森朱国战
Owner 郑州明珠实业有限公司
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