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Preparation method of high-purity superfine alumina powder body

A technology of ultra-fine alumina and aluminum hydroxide, applied to alumina. It can solve the problems of incomplete chemical reaction and low product purity, and achieve the effect of saving equipment and investment, high purity and low production cost.

Inactive Publication Date: 2003-02-05
刘明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process adopts nitrogen atomization, which has high requirements on equipment, and the product is off-white powder, the chemical reaction is not complete, and the purity of the product is not high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Taking the production of product 100kg of the present invention as example used raw materials and proportioning and preparation method thereof are as follows:

[0025] (1) Preparation of active aluminum powder slurry

[0026] Put 55kg of aluminum ingot with a purity of 99.993% in an aluminum alloy melting and holding furnace, heat it to 860°C to melt it, use compressed air with a pressure of 2.5MPa as the atomizing medium, and deionized water as the cooling medium in the quenching mist The aluminum liquid is atomized on the chemical equipment to obtain active aluminum powder slurry with a concentration of 1.5%. Control the temperature of the active aluminum powder slurry below 25°C. The atomization medium is compressed air, which simplifies the process, saves equipment and investment, and through the precise control of the process conditions during atomization powder making, it can ensure that the surface of the generated aluminum powder does not passivate under the co...

Embodiment 2

[0037] Taking the production of product 100kg of the present invention as example used raw materials and proportioning and preparation method thereof are as follows:

[0038] (1) Preparation of active aluminum powder slurry

[0039] Put 55kg of aluminum ingots with a purity of 99.993% in an aluminum alloy melting and holding furnace, heat it to 900°C to melt it, use compressed air with a pressure of 4MPa as the atomizing medium, and use deionized water as the cooling medium to rapidly cool and atomize The aluminum liquid is atomized on the equipment to obtain active aluminum powder slurry with a concentration of 1%. Control the temperature of the active aluminum powder slurry below 25°C.

[0040] (2) Preparation of aluminum hydroxide sol

[0041] The active aluminum powder slurry prepared in step (1) is separated from the coarse powder greater than 250 mesh in the aluminum powder slurry by sieving method or sedimentation method, and the aluminum powder slurry is concentrated...

Embodiment 3

[0050] Taking the production of product 100kg of the present invention as example used raw materials and proportioning and preparation method thereof are as follows:

[0051] (1) Preparation of active aluminum powder slurry

[0052] Put 55kg of aluminum ingot with a purity of 99.993% in an aluminum alloy melting and holding furnace, heat it to 800°C to melt it, use compressed air with a pressure of 1MPa as the atomizing medium, and use deionized water as the cooling medium in the quenching atomization The aluminum liquid is atomized on the equipment to obtain active aluminum powder slurry with a concentration of 2%. Control the temperature of the active aluminum powder slurry below 25°C.

[0053] (2) Preparation of aluminum hydroxide sol

[0054] The activated aluminum powder slurry prepared in step (1) is separated from the coarse powder greater than 250 mesh in the aluminum powder slurry by sieving or sedimentation, and the aluminum powder slurry is concentrated to 70% by ...

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PUM

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Abstract

The preparation method of high-purity superfine aluminium oxide powder body includes the following steps: melting aluminium in aluminium alloy melting heat-insulating furnace, using compressed air as atomization medium, and using deionized water as cooling medium to atomize aluminium liquor to obtain active aluminium powder paste body, concentrating to obtain concentrated aluminium powder paste body, adding aluminium hydroxide crystal seed whose concentration is 30-50% and grain size is 10-30 nm, making hydrolysis and reaction to produce aluminium hydroxide sol, drying at 110 deg.C to obtain aluminium hydroxide powder body, placing the power body in furnace, making phase conversion treatment for 2-4 hr. at 650-850 deg.c to obtain gamma-Al2O3 powder body, then making phase conversion treatment at 1100-1250 deg.c for 3-5 hr.

Description

technical field [0001] The invention belongs to the technical field of aluminum compounds, and in particular relates to aluminum oxide. Background technique [0002] High-purity ultra-fine alumina powder generally refers to a purity of ≥99.99%, a particle size of micron or submicron, and has different specific requirements depending on its use. High-purity ultra-fine alumina powder has a wide range of uses, such as the preparation of high-pressure sodium lamps, fluorescent powder, abrasive materials, artificial crystals, artificial gemstones, etc. [0003] At present, the methods for preparing high-purity ultrafine alumina powder mainly include aluminum ammonium sulfate pyrolysis method, aluminum ammonium carbonate pyrolysis method, organic aluminum hydrolysis method, spark discharge method, mercuric chloride activated hydrolysis method, hydrothermal method and activated aluminum powder water Solution etc. Among the above methods, organic aluminum hydrolysis method, mercur...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/42C01F7/44
Inventor 刘明姚炜如
Owner 刘明
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