Method for electrochemically preparing high-purity aluminum oxide

A high-purity alumina, electrochemical technology, applied in the electrolysis process, electrolysis components and other directions, can solve the problems of high product cost, fire and explosion, and achieve the effect of low production cost, short operation period and stable quality

Inactive Publication Date: 2012-07-11
新疆哥兰德新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process requires a large amount of alcohol stock and distillation system, the possibility of fire and explosion during operation is high, and the cost of the product is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 2 kg of electrolytic aluminum ingot with a purity of 99% is used as the anode, spectrally pure graphite is used as the cathode, and 50 L of sodium hydroxide solution with pH=8 is used as the electrolyte. Connect direct current, apply a voltage of 1.7V for electrolysis, and electrolyze for 4 hours at a temperature of 18°C. The aluminum hydroxide produced by electrolysis is sucked into the centrifuge by siphon for centrifugal separation, and after cleaning, high-purity aluminum hydroxide is obtained. The obtained high-purity aluminum hydroxide was dried at 120°C for 5 hours, and then roasted at 1000°C for 5 hours to obtain 1.8kg of high-purity alumina with a purity of 99.996%.

Embodiment 2

[0016] 2 kg of electrolytic aluminum ingot with a purity of 99% is used as the anode, graphite with a purity of spectral purity is used as the cathode, and 50 L of sodium hydroxide solution with pH=9 is used as the electrolyte. Connect direct current, apply a voltage of 1.8V for electrolysis, and electrolyze for 4 hours at a temperature of 35°C. The aluminum hydroxide produced by electrolysis is sucked into the centrifuge by siphon for centrifugal separation, and after cleaning, high-purity aluminum hydroxide is obtained. The obtained high-purity aluminum hydroxide was dried at 160°C for 3 hours, and then roasted at 1100°C for 4 hours to obtain 2.0kg of high-purity alumina with a purity of 99.997%.

Embodiment 3

[0018] 2 kg of electrolytic aluminum ingot with a purity of 99% was used as the anode, graphite with a purity of spectral purity was used as the cathode, and 50 L of sodium hydroxide solution with pH=10 was used as the electrolyte. Connect to direct current, apply a voltage of 2.0V for electrolysis, and conduct electrolysis for 4 hours at a temperature of 45°C. The aluminum hydroxide produced by electrolysis is sucked into the centrifuge by siphon for centrifugal separation, and after cleaning, high-purity aluminum hydroxide is obtained. Dry the prepared high-purity aluminum hydroxide at 200°C for 2 hours, and roast at 1300°C for 2 hours to obtain 2.1 high-purity alumina with a purity of 99.995%.

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Abstract

The invention relates to a method for electrochemically preparing high-purity aluminum oxide, which comprises the following steps of: taking an electrolytic aluminum ingot with a purity of 99 percent as an anode, graphite with pure spectrum as a cathode and alkaline liquor with a pH value of 8-10 as an electrolyte, wherein the alkaline liquor is one of potassium hydroxide solution, sodium hydroxide solution and ammonia water; switching on direct current, applying the voltage of 1.7-2.0 V for electrolysis and controlling the electrolysis temperature within 18-45 DEG C; sucking aluminum hydroxide generated by the electrolysis to a centrifugal machine for centrifugal separation by adopting a siphon method and cleaning to prepare the high-purity aluminum hydroxide; drying and roasting the prepared high-purity aluminum hydroxide to obtain the high-purity aluminum oxide with a purity of 99.995-99.9999 percent. The method has the advantages of good environment friendliness, simple production process control, short operation period, low production cost, and the prepared product is stable in quality and high in purity.

Description

technical field [0001] The invention belongs to the technical field of high-purity alumina preparation, in particular to a method for electrochemically preparing high-purity alumina. Background technique [0002] High-purity alumina powder is an advanced inorganic non-metallic material with excellent optical, electrical, magnetic, thermal and mechanical properties. It is widely used in the field of new materials and modern industry, mainly for high-quality integrated circuits in the information industry Ceramic substrates, light-emitting diode substrate materials, transparent alumina tubes for high-pressure sodium lamps, artificial sapphire and ruby ​​for artificial crystal laser generators, coatings for carrier catalysts, high-precision grinding materials, artificial joints and bones, infrared absorption and heating powder And some basic materials in the field of new materials such as emerging fluorescent decorative materials. High-purity alumina powder has become one of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00
Inventor 张海霞谢宏伟田鹏
Owner 新疆哥兰德新能源有限公司
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