Method for preparing alumina powder with small particle diameter

A technology of alumina powder and small particle size, which is applied in the preparation of aluminum hydroxide, alumina/hydroxide and other directions, can solve the problems such as the composition of promoters without given preparation conditions, and achieves small particle size, easy realization, Highly reactive effect

Inactive Publication Date: 2005-09-21
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the specific preparation conditions and accelerator composition are not given in the paper.

Method used

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  • Method for preparing alumina powder with small particle diameter
  • Method for preparing alumina powder with small particle diameter
  • Method for preparing alumina powder with small particle diameter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh Al(NO 3 ) 3 .9H 2 O 1.0 mole, use deionized water to prepare solutions with a concentration of 1.0 mol / L, add nitric acid to adjust pH = 2; prepare ammonium bicarbonate solution, concentration 2 mol / L, adjust pH = 9 with ammonia water; weigh NH 4 F 0.005mol and NH 4 Cl 0.005mol, add ammonium bicarbonate solution; heat the ammonium bicarbonate solution to 40°C, add the aluminum salt solution into the ammonium bicarbonate solution, and stir at the same time. Keep the pH of the precipitation system = 9 by adding ammonia water; after all the aluminum salt solution is added, continue to stir for 2 hours; stop stirring, let the precipitation stand, pour off the supernatant, wash the precipitate with deionized water once, dehydrate, Dry to obtain a white powder; burn the dried powder at a temperature of 900 to 1400° C. for 1 hour to obtain dispersed α-alumina powder, and the particles are disc-shaped.

Embodiment 2

[0024] Weigh AlCl 3 .6H 2 O 1.0 mole, use deionized water to prepare solutions with a concentration of 1.0 mol / L, add nitric acid to adjust pH = 2; prepare ammonium bicarbonate solution, concentration 2 mol / L, adjust pH = 9 with ammonia water; weigh NH 4 F 0.005mol and NH 4 NO 3 0.005mol, the rest are the same as in Example 1, and the alumina particles obtained are disc-shaped.

Embodiment 3

[0026] Weigh Al 2 (SO 4 ) 3 .6H 2 O 1.0 mole, was prepared with deionized water respectively to a solution with a concentration of 1.0 mol / L, the rest were the same as in Example 1, and the alumina particles obtained were disc-shaped.

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Abstract

This invention relates to a method for producing the small size aluminum oxide powder, which comprises the following steps: 1) preparing aluminium salt solution in the concentration of aluminium ion of 0.3-3.5 mol/L and PH of 1-5 by deionized water, 2) preparing the ammonium acid carbonate solution in the concentration of 1-3 mol/L and PH of 8-10 adjusted by ammonial solution, 3) adding additive into the ammonium acid carbonate solution, 4) heating the ammonium acid carbonate solution to the temperature of 20-80 Deg. C, adding the aluminium salt solution into the ammonium acid carbonate solution, stirring and adjusting the PH of deposition in 8-10 by adding ammonial solution, 5) after adding all aluminium salt solution, stirring 1-5 h followed, 6) stopping and stewing or centrifugal sedimentating, pouring the supernatant fluid, washing the deposition by deionized water or ethyl alcohol 1-3 times, dewatering and drying to get the puffy powder, 7) incandescing the powder under the temperature of 900-1400 Deg. C at last one time of 5 min to 10 h to get the dispersed alpha-aluminum oxide powder.

Description

technical field [0001] The invention relates to a method for preparing alumina powder with small particle size. It belongs to phosphor raw material and ceramic powder preparation [0002] technology field. Background technique [0003] Alumina powder has a wide range of uses, including as a raw material for luminescent materials. [0004] At present, alumina used as a raw material for fluorescent powder is mainly prepared by thermal decomposition of ammonium aluminum sulfate or ammonium aluminum carbonate, improved Bayer method, organic alkoxide method and other methods. German patents 2604083, 2215594, 2419544, British patent 541538, Chinese patents CN1312221A, CN1342609A, CN1034700A, CN1050145A, CN1079718A, etc. all mention the preparation method of alumina powder. [0005] The alumina prepared by the above method is generally a hard aggregate of amorphous fine particles, with irregular shape and many voids and gaps. When used as alumina raw ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30C01F7/34
Inventor 董岩蒋建清于金方峰
Owner SOUTHEAST UNIV
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