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A process for increasing the volume density of tabular alumina

A tabular corundum and bulk density technology, applied in the field of refractory materials, can solve problems such as unsatisfactory results, achieve good effects, improve grain boundary characteristics, and increase bulk density.

Active Publication Date: 2020-05-12
山东恒嘉高纯铝业科技股份有限公司
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  • Summary
  • 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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  • A process for increasing the volume density of tabular alumina
  • A process for increasing the volume density of tabular alumina

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. Co-milling after mixing lanthanum oxide and γ-alumina powder to obtain a co-milled fine powder with a D50 of 7 μm, wherein the mass ratio of lanthanum oxide and γ-alumina powder is 0.01:99.99;

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

[0040] 3. The large raw meal balls are continuously dried at 400-450°C and then sent into the shaft kiln. After being fired at 1850-1900°C, they are cooled to 80±5°C and exit the kiln. After inspection, they are crushed into products of different specifications.

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

Embodiment 2

[0043] 1. Co-milling after mixing lanthanum oxide and γ-alumina powder to obtain a co-milled fine powder with a D50 of 8 μm, wherein the mass ratio of lanthanum oxide and γ-alumina powder is 0.05:99.95;

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

[0045] 3. The large raw meal balls are continuously dried at 400-450°C and then sent into the shaft kiln. After being fired at 1850-1900°C, they are cooled to 80±5°C and exit the kiln. After inspection, they are crushed into products of different specifications.

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

Embodiment 3

[0048] 1. Co-milling after mixing lanthanum oxide and γ-alumina powder to obtain a co-ground fine powder with a D50 of 10 μm, wherein the mass ratio of lanthanum oxide and γ-alumina powder is 0.025:99.975;

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

[0050] 3. The large raw meal balls are continuously dried at 400-450°C and then sent into the shaft kiln. After being fired at 1850-1900°C, they are cooled to 80±5°C and exit the kiln. After inspection, they are crushed into products of different specifications.

[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, and relates to a preparation process of plate-shaped corundum refractory raw materials, in particular to a process for increasing the volume density of plate-shaped corundum. Background technique [0002] Tabular alumina is formed by sintering alumina fine powder rapidly in an ultra-high temperature shaft kiln after being pelletized and dried. Due to the high melting point and high purity of alumina, it 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 sintering densification by liquid phase sintering mechanism. However, in this method, the existence of the liquid phase will reduce the high-temperature performance of tabular alumina, and the second is that the sintered body has low porosity, fine and dense crystals, and poor thermal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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