Method for preparing nano alumina

A technology of nano-alumina and aluminum nitrate, which is applied in the field of preparation of nano-alumina and high-gravity method to prepare nano-alumina, which can solve the problems of inability to achieve high purity and uneven particle size distribution of alumina, and achieve low cost and few varieties , simple process and equipment

Inactive Publication Date: 2012-01-25
XIANGTAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0012] Aiming at the disadvantages of uneven distribution of alumina particle size and inability to achieve high purity in the existing process, the

Method used

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  • Method for preparing nano alumina
  • Method for preparing nano alumina
  • Method for preparing nano alumina

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 150g of aluminum nitrate to 2L of water, add 68.4g of sucrose to obtain a solution with a concentration of 0.2mol / L of aluminum nitrate, the molar ratio of sucrose to aluminum nitrate is 0.5:1, stir until it is completely dissolved, and transfer to the spiral channel rotating bed for circulation , adjust the rotating speed to be 800rpm, and the circulation flow rate to be 350L / h, then add 5% ammonia solution dropwise to the solution until the pH=5.5 and stop the dropwise addition to form a sol. Transfer out the sol solution, place it in a water bath at 80°C for 2h, and then transfer it to a ventilated drying oven at 120°C for 36h to obtain a black-gray precursor XRD pattern as shown in figure 1 As shown, there is no obvious sucrose or NH in the figure 4 NO 3 Crystal phase diffraction peaks appeared, and the sucrose may have undergone a dehydration reaction during the gel combustion process and was preserved in the form of carbon elements. Sucrose (or its dehydrati...

Embodiment 2

[0034] Alumina was prepared in the same manner as in Example 1, except that the amount of sucrose added was 96.7g, the molar ratio of sucrose to aluminum nitrate was 0.7:1, the rotating speed was 1000rpm, and the temperature set during calcination was 1200°C. The resulting product is alpha-alumina.

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Abstract

The invention belongs to the field of inorganic material preparation and relates to a method for preparing nano alumina, and in particular relates to a method for preparing nano alumina by using a supergravity method. Aiming at the defects in the prior art, a method, which has simple process and low cost, is safe to operate and is easy to industrial product on large scale, for preparing nano alumina is provided. The method adopted in the invention has simple process and low cost, prepared alumina has high purity and uniform particle size, and is easy to achieve large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of inorganic material preparation, and relates to a method for preparing nano-alumina, in particular to a method for preparing nano-alumina by a supergravity method. technical background [0002] Alumina is widely used, and has important uses in the fields of abrasives, structural materials, refractory materials, luminescent materials, aerospace, catalysts and their carriers, and is in great demand. Therefore, there is a need for a method with controllable scale, loose shape, low cost, simple preparation process and good reproducibility to prepare alumina powder materials. [0003] At present, alumina powder is mainly produced in industry by Bayer method, chemical precipitation method and aluminum salt thermal decomposition method. Aluminum salt thermal decomposition method requires special heating equipment under high temperature conditions, and such as aluminum ammonium sulfate thermal decomposition method often re...

Claims

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Application Information

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IPC IPC(8): C01F7/02B82Y40/00
Inventor 周继承孙若力肖伶俐
Owner XIANGTAN UNIV
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