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Method for producing sintering plate-like corundum by ultra-high temperature shaft kiln

A process method and tabular corundum technology are applied in the field of preparation of basic refractory materials, which can solve the problems such as few public reports on tabular corundum production methods and no tabular corundum process methods, and can achieve increased density, increased density, Not easy to layer effect

Inactive Publication Date: 2007-12-12
HANZHONG QIYUAN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the research on the production method of tabular alumina has been intensively carried out at home and abroad, so far, there are few public reports on the production method of tabular alumina. The method does not have a complete public technical information

Method used

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  • Method for producing sintering plate-like corundum by ultra-high temperature shaft kiln
  • Method for producing sintering plate-like corundum by ultra-high temperature shaft kiln

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Embodiment

[0026] Overall process flow of the present invention is:

[0027]

[0028] The specific steps are:

[0029] Step 1: Raw material selection

[0030] Choose low-sodium high-purity calcined alumina powder as raw material, and its chemical index should meet: Al 2 o 3 >98.5%, Na 2 O2 2 o 3 <0.05%.

[0031] Step 2: Grinding

[0032] Put the above raw materials into the vibrating grinder for grinding. The grinding machine is made of alumina corundum lining and corundum grinding balls. The vibrating grinder is equipped with an airflow classifier. The fineness of the fine powder is controlled by adjusting the speed of the classifier, requiring φ The content of fine powder <10μm is greater than 95%, and then sent into the pulse dust collector by wind for ball formation.

[0033] Step Three: Form a Ball

[0034] The φ2000 disc ball forming machine and the φ1500×4500 roller ball forming machine are used to form balls in two steps. That is to say, the above-mentioned grinding p...

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Abstract

The invention discloses a method for producing sintered plate corundum by using ultra- high temperature shaft furnace. It employs low- sodium high- purity pre-sintered aluminum oxide powder Al2O3>98.5% as raw material, grinding, ball forming and drying; feeding ball material into high- temperature shaft furnace and calcining at 1850- 1920 Deg. C, keeping temperature for 1- 1.5 hours, ventilating and cooling for two times to make the temperature of ball material at discharge port be reduced to 80 Deg. C, disintegrating sintered ball material, sifting and getting final product. The invention is characterized in that the crystal size of plate corundum is 20- 200 um, activity is high, and the product quality are very good: density (g / cm3): 3.58- 3.62, porosity(%) is less than 5, water absorption rate (%) is less than 1.5; and the electron microscopic structure is: crystal size is 0- 200 um, and the crystal is equipped with close pores less than 10 um, and the crystal structure is compact.

Description

technical field [0001] The invention relates to a preparation process of a basic refractory material, in particular to a production method of plate-shaped corundum, in particular to a process for producing sintered plate-shaped corundum by using an ultra-high temperature shaft kiln. Background technique [0002] Tabular alumina was developed by Alcoa in the 1930s and put into industrial production in the 1970s as a high-purity refractory raw material. It has been widely used in metallurgy, ceramics, chemical and glass industries as a metallurgical industry. Unshaped refractory materials in functional materials such as submerged nozzles are also used as basic materials for refractory products such as high-temperature furnace linings. Moreover, the service life of tabular alumina is four times that of ordinary refractory materials, and its superior performance has become an updated product of refractory materials. [0003] The following table can reflect the quality gap betwe...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/10C04B35/622
Inventor 王晓林李荣俊李拥军钟大贵
Owner HANZHONG QIYUAN NEW MATERIAL
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