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A method for preparing nano-alumina powder by electrochemical method

A nano-alumina and aluminum hydroxide technology, applied in the electrolysis process, electrolysis components and other directions, can solve the problems of low product efficiency and high raw material cost, and achieve the effects of low production cost, simple preparation process and strong scale benefit.

Active Publication Date: 2015-08-26
SUZHOU HUAZE NANO MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned methods are all nano-alumina prepared by electrochemical methods, they all have the disadvantages of high raw material cost and low product efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of the nano-alumina of the present embodiment is carried out according to the following steps:

[0026] The surface-treated aluminum plate is used as the cathode and the anode at the same time, placed in the benzyltrimethylammonium chloride electrolyte solution with a content of 200g / L, at a pH of 7-8, and a current density of 3A / dm 2 , the temperature is 60°C, and the air agitation volume is 800L / min to electrolyze the aluminum plate. When the precipitation content in the electrolyte reaches 28%, the aluminum hydroxide powder is obtained after filtering the bath liquid; after the aluminum hydroxide powder is washed, put it into a high-pressure container, and add pure water, crystal seeds and filter cake weight 5 % citric acid; hydrothermal treatment was carried out at a constant temperature of 6 hours at a temperature of 200°C and a pressure of 12kg; the amount of pure water was 4 times the weight of the aluminum hydroxide powder; the seed crysta...

Embodiment 2

[0029] The preparation method of the nano-alumina of the present embodiment is carried out according to the following steps:

[0030] The surface-treated aluminum plate is used as the cathode and anode electrodes at the same time, placed in the electrolyte solution containing 400g / L choline chloride, at pH 8-10, the current density is 1A / dm 2 , the temperature is 30°C, and the air agitation volume is 100L / min to electrolytic aluminum plate. When the precipitation content in the electrolyte reaches 25%, filter the bath to obtain aluminum hydroxide powder; wash the aluminum hydroxide powder, put it into a high-pressure container, and add pure water, crystal seeds and aluminum hydroxide powder Citric acid with a body weight of 5% is subjected to hydrothermal treatment at a constant temperature of 100°C and a pressure of 10kg for 1 hour; the amount of pure water used is 3 times the weight of the aluminum hydroxide powder; the seed crystal is a nanometer with a particle size of 5nm...

Embodiment 3

[0033] The preparation method of the nano-alumina of the present embodiment is carried out according to the following steps:

[0034] The surface-treated aluminum plate is used as the cathode and anode electrodes at the same time, and placed in the electrolyte solution containing benzyltriethylammonium chloride with a content of 400g / L. At pH 8-10, the current density is 5A / dm 2 , the temperature is 90°C, and the air stirring volume is 1000L / min under the conditions of electrolytic aluminum plate. When the content of aluminum hydroxide powder in the electrolyte reaches 30%, filter the bath solution to obtain aluminum hydroxide powder; wash the aluminum hydroxide powder, put it into a high-pressure container, and add pure water, seed crystal and The tartaric acid with 10% weight of aluminum hydroxide powder is subjected to hydrothermal treatment at a temperature of 300°C and a pressure of 87kg at a constant temperature for 30 hours; the amount of pure water is 5 times the weigh...

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Abstract

The invention discloses a method for preparing nano aluminum oxide powder by an electrochemical method. In the method, aluminum is electrolyzed, and then the electrolysis product is subjected to washing, hydro-thermal treatment, washing, drying and calcining to obtain the10-90nm aluminum oxide powder. According to the invention, effective control on the particle size of aluminum oxide is realized by adjusting the current, voltage and pH and adopting the hydro-thermal treatment technology. The preparation technology of the nano aluminum oxide powder prepared by the method disclosed by the invention is simple, the production period is short, the yield is high, the product stability is good, and environmental pollution is avoided. Through the invention, the prepared nano aluminum oxide powder is widely applied to multiple fields of military industry, automobiles, metallurgy, chemical industry, ceramics and the like.

Description

technical field [0001] The invention relates to a method for preparing alumina, in particular to a method for preparing nano-alumina powder by an electrochemical method. Background technique [0002] Nano-alumina is a kind of ultra-fine particles with a particle size of 1~100nm, which has strong volume effect, quantum size effect, surface effect and macroscopic quantum tunnel effect, making it high strength, high hardness, wear resistance and corrosion resistance. It has excellent characteristics in terms of high temperature resistance and high temperature resistance. It has been widely used in military industry, automobile, metallurgy, chemical industry, ceramics and other fields as a new type of functional material and structural material. In recent years, a large number of literatures have reported major breakthroughs in the application of nano-alumina in composite electroplating, fluorescent materials, and infrared absorbing materials. However, the preparation technolog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00
Inventor 黄克宙李声泽李旻岳永刚何明利
Owner SUZHOU HUAZE NANO MATERIALS
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