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Low-cost nano aluminum oxide powder preparation method and nano aluminum oxide powder

A nano-alumina, alumina technology, applied in the preparation of alumina/hydroxide, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of high price, low production and high cost, and achieve easy The effect of industrialized production, improvement of natural environment, and simple production process

Inactive Publication Date: 2013-12-18
SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, nano-alumina mostly uses expensive alkoxides or more expensive pure aluminum salts (such as aluminum chloride, aluminum nitrate, etc.) as raw materials. The cost is high, the production is small, and the price remains high, which seriously limits its application and industry. process

Method used

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  • Low-cost nano aluminum oxide powder preparation method and nano aluminum oxide powder
  • Low-cost nano aluminum oxide powder preparation method and nano aluminum oxide powder
  • Low-cost nano aluminum oxide powder preparation method and nano aluminum oxide powder

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preparation example Construction

[0024] The preparation method of the present invention is to use industrial waste or cheap intermediate products (these raw materials are cheap but have various impurities) as substitute raw materials to produce nano-alumina powder materials with satisfactory purity. The preparation method of the present invention has two technical keys to be solved: 1) removal of impurities in raw materials; 2) selection of optimal conditions for large-scale production.

[0025] In the preparation method of the present invention, there are two kinds of raw materials that are easy to obtain: 1. Alumina waste catalysts in the petrochemical industry (some varieties contain more than 50% alumina, with an annual output of more than 1,000 tons, most of which cannot be used for landfill treatment); 2. Waste aluminum car scraps in the aluminum alloy processing industry (currently thousands of tons of this kind of waste is only in Shanghai every year, and 2,000 yuan per ton is used for waste treatment,...

Embodiment 1

[0053] Step 1. Preparation of aluminum ammonium sulfate crystal (ammonium alum)

[0054] Use alumina waste catalyst as raw material: grind the waste catalyst into powder, weigh the sample according to the molar ratio of alumina content to ammonium bisulfate as 1:10, add it to molten ammonium bisulfate several times, and react for 1 hour. After cooling, add water to dissolve;

[0055] Alternatively, use scrap aluminum scraps as raw materials: weigh the scrap aluminum scraps according to the molar ratio of aluminum content to ammonium bisulfate as 1:3, add them to the saturated solution of ammonium bisulfate several times as appropriate, and place them overnight (12 hours), let it fully react;

[0056] Filter the solution after the above reaction, take the filtrate, heat and concentrate the filtrate, recrystallize it three times, pulverize it, and dry it at 60°C for 2 hours to obtain aluminum ammonium sulfate crystals.

[0057] Step 2, the preparation of basic ammonium aluminu...

Embodiment 2

[0062] Step 1. Preparation of aluminum ammonium sulfate crystal (ammonium alum)

[0063] Use alumina waste catalyst as raw material: grind the waste catalyst into powder, weigh the sample according to the molar ratio of alumina content to ammonium bisulfate as 1:8, add it to molten ammonium bisulfate several times, and react for 0.5 hours. After cooling, add water to dissolve;

[0064] Alternatively, use scrap aluminum scraps as raw materials: weigh the scrap aluminum scraps according to the aluminum content and ammonium bisulfate molar ratio of 1:3, add them to the saturated solution of ammonium bisulfate several times as appropriate, and place them overnight (8 hours), let it fully react;

[0065] Filter the solution after the above reaction, take the filtrate, heat and concentrate the filtrate, recrystallize it three times, pulverize it, and dry it at 60°C for 2 hours to obtain aluminum ammonium sulfate crystals.

[0066] Step 2, the preparation of basic ammonium aluminum...

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Abstract

The invention discloses a low-cost nano aluminum oxide powder preparation method which comprises the following steps: 1. preparing an aluminum ammonium sulfate crystal from an aluminum oxide spent catalyst or aluminum scrap turnings; 2. weighing aluminum ammonium sulfate and ammonium bicarbonate, respectively preparing water solutions with deionized water, slowly and dropwisely adding a NH4Al(SO4)2 solution into a NH4HCO3 mixed solution containing a certain amount of polyethyleneglycol according to a certain mol ratio at constant temperature while stirring, adding ammonia water to regulate the pH value, aging for 0.5-10 hours after the reaction finishes, carrying out vacuum filtration, washing with distilled water and anhydrous ethanol, and drying the precipitate to obtain an ammonium aluminum carbonate precursor; and 3. calcining the ammonium aluminum carbonate precursor at 800-1200 DEG C for 1-2 hours to obtain the nano aluminum oxide powder. By using waste as the raw material, the preparation method disclosed by the invention has the advantages of cost saving, simple production technique and not need of adding complex equipment, and can easily implement industrial production.

Description

technical field [0001] The invention relates to a preparation method of nano-alumina powder, in particular to a low-cost preparation method of nano-alumina powder and the nano-alumina powder prepared according to the preparation method. Background technique [0002] Nano-alumina has good thermal, optical, electrical, magnetic and chemical properties due to the surface effect, quantum size effect, volume effect, and macroscopic quantum tunneling effect, so it is widely used in traditional industries (light industry, Chemical industry, building materials, etc.) and new materials, microelectronics, aerospace industry and other high-tech fields, its application prospects are very broad. Nano-alumina materials are nano-materials with important application value and development prospects. They have been widely used as heat-resistant materials, missile windows and high-pressure sodium lamp tube materials, computer integrated circuit substrates, wear-resistant materials and bioceram...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30B82Y30/00
Inventor 刘白刘力睿
Owner SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
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