Production method of 5N high-purity aluminum oxide polycrystal material

A high-purity alumina, production method technology, applied in the direction of aluminate/alumina/aluminum hydroxide purification, etc., can solve problems such as difficult to achieve fixed heating and melting, difficult operation, dust pollution in the operating environment, etc.

Inactive Publication Date: 2013-04-03
SICHUAN XINJU MINERAL RESOURCE DEV CO LTD
View PDF4 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the patent CN101913636A uses graphite electrode strips as the arc-starting heating material. Although it can achieve the purpose of heating and melting, there are problems of graphite products contaminating materials and chemical reactions with raw materials at high temperatures, which affects product quality; patent CN102503357A uses hydrogen-oxygen flame heating It is theoretically feasible to establish a melting "seed area" for alumina powder, but it is difficult to operate in practice. Specifically, when the alumina powder is heated with an oxyhydrogen flame, the powder is instantly lifted under the action of the oxyhydrogen flame flow, making it difficult to fix Heated and melted, and caused dust pollution in the operating enviro

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Production method of 5N high-purity aluminum oxide polycrystal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) First prepare a high-frequency induction heating furnace (300Kw high-frequency power supply, crucible inner diameter Φ500mm, height 500mm) coated with a chemically stable high-temperature resistant coating for both the cold crucible and the copper tube for the induction coil, and put it into the coated cold crucible Add 50Kg of 5N high-purity alumina powder raw material at one time, the charging volume accounts for 80% of the volume of the crucible, add 5N high-purity metal aluminum sheet with a mass of 270g, select an aluminum sheet with a size of 5×5×0.5mm, and place it in a quadrilateral shape 5cm away from the powder surface;

[0019] (2) Start the circulating soft water cooling system, turn on the power of the high-frequency induction generator, and adjust the frequency to 8MHz, so that the heat released by the oxidation of metal aluminum can melt the surrounding alumina powder, and gradually form a small melting zone. The adjacent alumina powder melts graduall...

Embodiment 2

[0024] (1) First prepare a high-frequency induction heating furnace (300Kw high-frequency power supply, crucible inner diameter Φ500mm, height 500mm) coated with a chemically stable high-temperature resistant coating for both the cold crucible and the copper tube for the induction coil, and put it into the coated cold crucible Add 55Kg of 5N high-purity alumina powder raw material at one time, the charging volume accounts for 95% of the volume of the crucible, add 5N high-purity metal aluminum sheet with a mass of 270g, select an aluminum sheet with a size of 10×10×0.25mm, and place it in a quadrilateral shape 1cm away from the powder surface;

[0025] (2) Start the circulating soft water cooling system, turn on the power of the high-frequency induction generator, and adjust the frequency to 10MHz, so that the heat released by the oxidation of metal aluminum can melt the surrounding alumina powder, and gradually form a small melting zone. The adjacent alumina powder melts grad...

Embodiment 3

[0030] (1) First prepare a high-frequency induction heating furnace (300Kw high-frequency power supply, crucible inner diameter Φ500mm, height 500mm) coated with a chemically stable high-temperature resistant coating for both the cold crucible and the copper tube for the induction coil, and put it into the coated cold crucible Add 50Kg of 5N high-purity alumina powder raw material at one time, the charging volume accounts for 80% of the volume of the crucible, add 5N high-purity metal aluminum sheet with a mass of 270g, select an aluminum sheet with a size of 20×20×0.1mm, and place it in a quadrilateral shape 5cm away from the powder surface;

[0031] (2) Start the circulating soft water cooling system, turn on the power supply of the high-frequency induction generator, and adjust the frequency to 9MHz, so that the heat released by the oxidation of metal aluminum can melt the surrounding alumina powder, and gradually form a small melting zone. The adjacent alumina powder melts...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a production method of a 5N high-purity aluminum oxide polycrystal material, which is characterized by comprising the following steps: adding a 5N high-purity aluminum oxide powder material into a cold crucible defined by a copper tube coated with a high-temperature-resistant coating, using a 5N high-purity metal aluminum sheet as an igniter, and adopting a high-frequency cold crucible technology to produce the 5N high-purity aluminum oxide polycrystal material product, wherein the appearance and shape of the product is a white columnar and acicular particle, the density is 3.5-3.9 g/cm<3>, the bulk density is 2.2-2.6 g/cm<3>, and the purity is greater than 5N. The production method disclosed by the invention is simple and easy to implement, and has the advantages of cost saving, energy saving, environment friendliness and the like.

Description

technical field [0001] The invention relates to a production method of a 5N high-purity alumina polycrystalline material, and belongs to the technical field of preparing high-purity and high-density fused alumina by a high-frequency cold crucible method. Background technique [0002] Chinese patent CN101913636A "Production method of high-purity and high-density alumina bulk raw material for sapphire single crystal", Chinese patent CN102503357A "A pre-melting crystallization method for high-purity α-alumina", Wang Jiao et al. (Preparation by cold crucible method α-Al 2 o 3 Research on process parameters of polycrystalline materials [J] Journal of Synthetic Crystals. 2012, 41 (3): 578-583). Among them, the patent CN101913636A uses graphite electrode strips as the arc-starting heating material. Although it can achieve the purpose of heating and melting, there are problems of graphite products contaminating materials and chemical reactions with raw materials at high temperatur...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01F7/46
Inventor 侯仁义产小华
Owner SICHUAN XINJU MINERAL RESOURCE DEV CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap