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Technology for increasing volume density of tabular corundum

A technology of platy corundum and bulk density, which is applied in the field of refractory materials, can solve problems such as unsatisfactory results, achieve good results, promote solid-phase reactions, and have good high-temperature performance

Active Publication Date: 2018-06-22
山东恒嘉高纯铝业科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In addition, there are also methods of increasing the temperature or prolonging the residence time in the shaft kiln to achieve the purpose of fully sintering the tabular alumina products so as to increase the bulk density of the tabular alumina, but the results are not satisfactory

Method used

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  • Technology for increasing volume density of tabular corundum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. Mix lanthanum oxide and γ-alumina powder and then co-grind to obtain a co-milled fine powder with a D50 of 7 μm, in which the mass ratio of lanthanum oxide to γ-alumina powder is 0.01:99.99;

[0039] 2. Add the fine powder to the Φ2.4m×6m drum type pelletizing machine, and continuously spray the pelletizing liquid to form small raw material pellets with a diameter of 10-12mm. After processing the pellets, add them to the pellets of the same specification. In the machine, under the same operation, a large raw material ball with a diameter of 20-25mm is formed, and the ball liquid is pure water;

[0040] 3. The large raw material balls are continuously dried at 400~450℃ and then sent to the shaft kiln. After being fired at 1850~1900℃, they are cooled to 80±5℃ and exit the kiln. After selection, they are broken into products of different specifications and sizes.

[0041] The burned products such as figure 1 As shown, the bulk density is 3.65g / cm 3 .

Embodiment 2

[0043] 1. Mix lanthanum oxide and γ-alumina powder and then grind together to obtain a co-milled fine powder with a D50 of 8μm, in which the mass ratio of lanthanum oxide to γ-alumina powder is 0.05:99.95;

[0044] 2. Add the fine powder to the Φ2.4m×6m drum type pelletizing machine, and continuously spray the pelletizing liquid to form small raw material pellets with a diameter of 10-12mm. After processing the pellets, add them to the pellets of the same specification. In the machine, under the same operation, a large raw material ball with a diameter of 20-25mm is formed, and the ball liquid is pure water;

[0045] 3. The large raw material balls are continuously dried at 400~450℃ and then sent to the shaft kiln. After being fired at 1850~1900℃, they are cooled to 80±5℃ and exit the kiln. After selection, they are broken into products of different specifications and sizes.

[0046] The bulk density of the burned product is 3.67g / cm 3 .

Embodiment 3

[0048] 1. Mix lanthanum oxide and γ-alumina powder and then grind together to obtain a co-milled fine powder with a D50 of 10 μm, in which the mass ratio of lanthanum oxide to γ-alumina powder is 0.025:99.975;

[0049] 2. Add the fine powder to the Φ2.4m×6m drum type pelletizing machine, and continuously spray the pelletizing liquid to form small raw material pellets with a diameter of 10-12mm. After processing the pellets, add them to the pellets of the same specification. In the machine, under the same operation, a large raw material ball with a diameter of 20-25mm is formed, and the ball liquid is pure water;

[0050] 3. The large raw material balls are continuously dried at 400~450℃ and then sent to the shaft kiln. After being fired at 1850~1900℃, they are cooled to 80±5℃ and exit the kiln. After selection, they are broken into products of different specifications and sizes.

[0051] The bulk density of the burned product is 3.66g / cm 3 .

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Abstract

The invention discloses a technology for increasing the volume density of tabular corundum. The technology comprises the steps that gamma-aluminum oxide and lanthanum oxide are mixed and ground, and ground powder is put into a ball forming machine, subjected to ball forming, dried and sintered to obtain tabular corundum, wherein the mass fraction of lanthanum oxide in the ground powder is 0.01-0.05%. According to the technology for increasing the volume density of tabular corundum, aiming at the characteristic that grain boundary migration influences crystal growth in solid-phase sintering inthe production process of tabular corundum, a small amount of lanthanum oxide is added to fine powder to improve the grain boundary characteristic, so that the aim of promoting sintering is achieved,the sintered product is high in volume density and good in crystal development, the liquid phase does not exist, and the sintering technology is easy to control.

Description

Technical field [0001] The invention belongs to the field of refractory materials, relates to a preparation process of plate-shaped corundum refractory raw materials, and specifically relates to a process for increasing the bulk density of plate-shaped corundum. Background technique [0002] Tabular corundum is quickly sintered in ultra-high temperature shaft kiln after alumina fine powder is pelletized and dried. Due to its high melting point and high purity, alumina is difficult to sinter. Therefore, a small amount of sintering aid is often added during ordinary sintering, which can reduce the sintering temperature and sintering activation energy of alumina, and then promote the densification of sintering through the liquid phase sintering mechanism. But this method is that the existence of liquid phase will reduce the high temperature performance of the tabular corundum, and the sintered body has low porosity, fine and dense crystals, and poor thermal shock resistance. [0003...

Claims

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Application Information

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IPC IPC(8): C04B35/117C04B35/622C04B35/66
CPCC04B35/117C04B35/622C04B35/66C04B2235/3227C04B2235/5436C04B2235/656C04B2235/77
Inventor 邵长波李桂梅赵萍
Owner 山东恒嘉高纯铝业科技股份有限公司
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