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Clean production technology of nano spherical high-purity aluminum oxide

A high-purity alumina and clean production technology, applied in the direction of alumina/aluminum hydroxide, nanotechnology, nanotechnology, etc., can solve problems such as technical defects, large pollution, and complicated processes

Inactive Publication Date: 2018-10-12
郑强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some preparation methods are being gradually eliminated due to their own technical defects, large pollution and other reasons
Although the hydrolysis method and the improved Bayer method have the advantages of low cost, the product purity cannot meet the quality requirements
Some methods can produce 5N grade high-purity alumina, but the process is complicated, the cost is high, and the profit margin is small
The main technical indicators of high-purity alumina are: purity, particle size, dispersion, morphology, specific surface area, etc. The above methods can only control one or two of the technical indicators, and it is difficult to accurately control multiple indicators at the same time

Method used

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  • Clean production technology of nano spherical high-purity aluminum oxide
  • Clean production technology of nano spherical high-purity aluminum oxide
  • Clean production technology of nano spherical high-purity aluminum oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Firstly, the 4N refined aluminum ingot for remelting is processed into a 0.3 mm high-purity aluminum sheet by casting and rolling, the surface oil stains of the high-purity aluminum sheet are thoroughly cleaned, and the high-purity aluminum sheet is placed horizontally in pure water. The water is 18MΩ·cm electronic grade pure water, and the temperature of the pure water is 30°C. The laser used in this embodiment is a nanosecond pulsed laser, and the single pulse power of the pulsed laser is adjusted to be 1mJ, the pulse width is 100ns, the laser repetition frequency is 50KHz and the focal length is adjusted so that the laser peak power density is greater than or equal to 10 7 W / cm 2 . The laser performs layer-by-layer ablation on the high-purity aluminum sheet, and after ablation, an alumina slurry is obtained until the aluminum sheet is completely exhausted. The alumina slurry is filtered by nanofiltration, the filtered filtrate is recycled, and the obtain...

Embodiment 2

[0037] Example 2: Firstly, the 4N6 remelting refined aluminum ingot is processed into a 0.5mm high-purity aluminum sheet by casting and rolling, the surface oil of the high-purity aluminum sheet is thoroughly cleaned, and the high-purity aluminum sheet is placed horizontally in pure water. The water is 18MΩ·cm electronic grade pure water, and the temperature of the pure water is 10°C. The laser used in this embodiment is a picosecond pulse laser, and the single pulse power of the pulse laser is adjusted to 50 μJ, the pulse width is 10 ps, ​​the laser repetition frequency is 800 KHz and the focal length is adjusted to make the laser peak power density ≥ 10 9 W / cm 2 . The laser performs layer-by-layer ablation on the high-purity aluminum sheet, and after ablation, an alumina slurry is obtained until the aluminum sheet is completely exhausted. The alumina slurry is filtered by nanofiltration, and the filtered filtrate is recycled, and the obtained filter cake is dried at -30°C ...

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Abstract

The invention relates to a clean production technology of nano spherical high-purity aluminum oxide, aiming at solving the technical problems of an existing high-purity aluminum oxide preparation method of great pollution, complicated technology, high cost and uncontrollable technical indexes. The technology comprises the following specific steps: firstly, machining an aluminum ingot into an aluminum sheet and sufficiently washing; then immersing the aluminum sheet into pure water and ablating the surface of the aluminum sheet by utilizing laser, so as to obtain aluminum oxide slurry; then filtering the aluminum oxide slurry again to obtain an aluminum oxide filter cake; finally, drying and calcining the aluminum oxide filter cake to obtain an aluminum oxide finished product. The high-purity aluminum oxide prepared by the technology is not polluted completely and the indexes are accurate and controllable; the high-purity aluminum oxide has the advantages of high purity, uniform granularity, high sphericity, easiness for dispersion and the like.

Description

technical field [0001] The invention relates to the technical field of a novel inorganic non-metallic material, in particular to a clean production process of nano-spherical high-purity alumina. Background technique [0002] Benefiting from the explosive growth of LED lighting equipment and lithium-ion batteries, the demand for high-purity alumina is growing at a rate of about 30% per year. There are various preparation methods for high-purity alumina, mainly including: choline aluminum hydrolysis method, aluminum ammonium sulfate pyrolysis method, aluminum ammonium carbonate pyrolysis method, improved Bayer method, aluminum isopropoxide hydrolysis method, high-purity aluminum activated water Solution etc. Some preparation methods are being gradually eliminated due to their own technical defects, large pollution and other reasons. Although the hydrolysis method and the improved Bayer method have the advantages of low cost, the product purity cannot meet the quality require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01F7/02C01P2004/32C01P2004/62C01P2004/64C01P2006/80
Inventor 郑强甘溪
Owner 郑强
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