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Production method of 5N high-purity alpha alumina powder

A technology of alpha alumina and a production method, which is applied in the production field of 5N high-purity alpha alumina powder, can solve the problems of long reaction time, high requirements and cumbersome process, avoid cumbersome processes and complicated operations, and avoid product quality. The impact of the process, the effect of simple process operation

Inactive Publication Date: 2015-01-07
CHENGDU GUANYU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operation process of this method is relatively complicated, and the stability of the later product processing cannot be guaranteed.
[0010] The Chinese patent literature with the publication number CN102826579A reports a method for preparing high-purity alumina powder with a high-purity aluminum ingot with a purity >99.99%. The method requires steps such as synthesis reaction, cooling, purification, hydrolysis, drying, and calcination. The operation is complicated and the reaction time is long, and it needs to be carried out in a vacuum environment, which requires high equipment, and the use of mercuric chloride as the catalyst is easy to introduce new impurities, which restricts its popularization and application
[0011] The above methods cannot achieve 5N purity due to the problem of raw materials, or the process is complicated and the process is cumbersome.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The specific process steps are as follows:

[0040] Step 1: Put 4kg of aluminum pellets, 40kg of analytically pure isopropanol, and 400g of 5N aluminum isopropoxide into the reactor, the reaction temperature is 82°C, and the reaction is refluxed for 8 hours;

[0041] Step 2: Add zeolite to the reaction kettle, reduce the pressure to a vacuum of 1333Pa, collect high-purity aluminum isopropoxide at 135°C, and the yield is over 90%;

[0042] Step 3: Mix the aluminum isopropoxide obtained in the above steps with deionized water at a mass ratio of 1:4, stir and hydrolyze for 1 hour, and filter after the reaction;

[0043] Step 4: Hydrolyze the alumina hydrate powder obtained by the above steps into a microwave drying equipment and dry at 85°C for 1.5 hours;

[0044] Step 5: Put the hydrated alumina powder obtained after drying in the above steps into a microwave roasting furnace for transformation roasting, the microwave roasting temperature is 1250°C, and the roasting time...

Embodiment 2

[0049] The specific process steps are as follows:

[0050] Step 1: Put aluminum particles into the reaction kettle: the mass ratio of aluminum isopropoxide: isopropanol is 100:1:900; the reaction temperature is 90°C, and the reaction is refluxed for 4 hours; the aluminum particles are high-purity aluminum with a purity of 99.996% The purity of grains and aluminum isopropoxide is 5N, and isopropanol is analytically pure isopropanol;

[0051]Step 2: Distill the above reaction mixture under normal pressure, recover the remaining isopropanol in the reaction, add zeolite with a mass fraction of 0.1% aluminum isopropoxide, and distill under reduced pressure to 1340Pa, collect high-purity aluminum isopropoxide at 140°C, and collect rate above 90%;

[0052] Step 3: Mix the aluminum isopropoxide obtained in the above steps with deionized water at a mass ratio of 1:4.5, stir and hydrolyze for 1.5 hours, and filter after the reaction;

[0053] Step 4: Hydrolyze the alumina hydrate powd...

Embodiment 3

[0059] The specific process steps are as follows:

[0060] Step 1: Put aluminum particles into the reaction kettle: the mass ratio of aluminum isopropoxide: isopropanol is 100:1:900; the reaction temperature is 85°C, and the reflux reaction is for 6 hours; the aluminum particles are high-purity aluminum with a purity of 99.996% Granules, the purity of aluminum isopropoxide is 5N, and isopropanol is analytically pure isopropanol;

[0061] Step 2: Distill the above reaction mixture under normal pressure, recover the remaining isopropanol from the reaction, add zeolite with a mass fraction of 0.2% aluminum isopropoxide, and distill under reduced pressure to 1335Pa, collect high-purity aluminum isopropoxide at 145°C, and collect rate above 90%;

[0062] Step 3: Mix the aluminum isopropoxide obtained in the above steps with deionized water at a mass ratio of 1:4.2, stir and hydrolyze for 1.2 hours, and filter after the reaction;

[0063] Step 4: Hydrolyze the aluminum oxide powde...

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Abstract

The invention discloses a production method of 5N high-purity alpha alumina powder. The method comprises the following processing steps: carrying out reaction on 99.996% of high-purity aluminum particles, 5N aluminum isopropoxide as an initiator, and isopropanol to generate aluminum isopropoxide; before reduced pressure distillation, adding zeolite to the aluminum isopropoxide, and preventing liquid from boiling to bring out more impurities; stably distilling the 5N aluminum isopropoxide, hydrolyzing, filtering, drying, roasting and transforming into 5N-purity alpha alumina powder; and finally washing once by using deionized water, and drying to obtain the 5N high-purity alpha alumina powder. According to the method disclosed by the invention, the alpha alumina powder can be ensured to reach 5N purity; the purification difficulty is reduced; the process is simple and convenient, and easy to operate; the production cycle is shortened; meanwhile, the pollution to the environment is also reduced; and popularization and application are facilitated.

Description

technical field [0001] The invention relates to a production method of 5N high-purity α-alumina powder, in particular to a production method for preparing high-purity α-alumina powder by an aluminum alcohol method. Background technique [0002] High-purity alumina powder refers to ultra-fine alumina powder materials with a purity greater than 99.99% and uniform particle size. High-purity ultra-fine alumina has beneficial properties such as high hardness, high strength, wear resistance, corrosion resistance, high temperature resistance, oxidation resistance, good insulation, large surface area, small thermal expansion coefficient, good heat resistance, and low power loss. It is widely used in Insulation materials, electronic products, wear-resistant and corrosion-resistant materials, aerospace materials and other modern high-tech and new materials fields, such as 99.99% high-purity alumina series are mainly used in high-pressure sodium lamps, new luminescent materials, specia...

Claims

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Application Information

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IPC IPC(8): C01F7/42
CPCC01F7/42
Inventor 杜群芳
Owner CHENGDU GUANYU TECH
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