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Preparation method of ultrafine low-sodium alpha-alumina micropowder

A technology of alumina micropowder and alumina, which is applied in the field of abrasive polishing and sintered materials, can solve the problems affecting the compressive strength and electrical insulation of alumina products, high sintering temperature, uneven grains, etc. Small, low impurity content, and the effect of lowering the firing temperature

Active Publication Date: 2013-10-02
晋城市富基新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the domestic low-sodium ultrafine α-alumina generally has high sodium content, uneven crystal grains, and poor activity.
During the use of the product, it is easy to form scratches on the product when it is used for polishing; when it is used as electronic ceramics and wear-resistant products, due to the high content of sodium oxide, β-Al 2 o 3 , directly affects the compressive strength and electrical insulation of alumina products, and at the same time, when making 99 alumina ceramic products, the sintering temperature is too high, wasting energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Prepare industrial aluminum hydroxide with an average particle size of 25 μm and pure water into a slurry with a solid content of 150 g / L, move the slurry into a water bath heating kettle with a stirring device, and add hydrochloric acid with a concentration of 3 mol / L to adjust The pH value is 4, the mechanical stirring speed is set to 150r / min, the temperature is raised to 60°C, and the water bath treatment is performed for 1 hour. After the water bath treatment, the temperature is naturally cooled to room temperature, filtered with a centrifugal dehydrator, and washed with hot pure water. The filter cake was tested for 3 times, and the pH value was detected to be neutral, and then dried at a temperature of 110°C;

[0026] The method of washing the filter cake is as follows: take out the filter cake and wash it with hot pure water, then cool it down to room temperature naturally, and filter it again with a centrifugal dehydrator;

[0027] Add ammonium chloride to the ...

Embodiment 2

[0030] Prepare industrial aluminum hydroxide with an average particle size of 60 μm and pure water into a slurry with a solid content of 400 g / L, move the slurry into a water bath heating kettle with a stirring device, and add hydrochloric acid with a concentration of 3 mol / L to adjust The pH value is 5, the mechanical stirring speed is set to 100r / min, the temperature is raised to 100°C, and the water bath treatment is carried out for 0.5 hours. After the water bath treatment, the temperature is naturally cooled to room temperature, filtered with a centrifugal dehydrator, and washed with hot pure water. Filter cake 4 times, after detecting that the pH value is neutral, place it at 150°C for drying;

[0031] The method of washing the filter cake is as follows: take out the filter cake and wash it with hot pure water, then cool it down to room temperature naturally, and filter it again with a centrifugal dehydrator;

[0032] Add aluminum chloride to the dried material at a rati...

Embodiment 3

[0035] Industrial aluminum hydroxide with an average particle size of 45 μm and pure water are formulated into a slurry with a solid content of 200 g / L, and the slurry is moved into a water bath heating kettle with a stirring device, and glacial acetic acid with a concentration of 30% is added to adjust The pH value is 3, the mechanical stirring speed is set to 50r / min, the temperature is raised to 90°C, and the water bath treatment is carried out for 0.3 hours. After the water bath treatment, the temperature is naturally cooled to room temperature, filtered with a centrifugal dehydrator, and washed with hot pure water. Filter cake 2 times, after detecting that the pH value is neutral, place it at 120°C for drying;

[0036] The method of washing the filter cake is as follows: take out the filter cake and wash it with hot pure water, then cool it down to room temperature naturally, and filter it again with a centrifugal dehydrator;

[0037] Add aluminum chloride to the dried ma...

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Abstract

The invention relates to a preparation method of ultrafine low-sodium alpha-alumina micropowder, and belongs to the technical field of abrasive polishing and sintered body materials. The preparation method of ultrafine low-sodium alpha-alumina micropowder is provided for realizing the reduction of the content of sodium in a raw material aluminum hydroxide, so the sintering temperature is reduced, and the uniformity of the crystal grain granularity of a product is guaranteed. A technical scheme adopted in the invention is characterized in that the preparation method of ultrafine low-sodium alpha-alumina micropowder comprises the following steps: 1, precursor treatment: adding pure water to industrial-grade aluminum hydroxide to prepare a uniform slurry, and adding an acid for sodium removal; 2, calcining: adding the treated aluminum hydroxide to a chloride mineralizer, uniformly mixing, and calcining at 1100-1350DEG C for 1-8h to obtain alpha-alumina; and 3, grinding: crushing the obtained calcining product alpha-alumina to the original grain size in order to obtain alpha-alumina micropowder.

Description

technical field [0001] The invention discloses a method for preparing ultrafine, low-sodium α-alumina micropowder, which belongs to the technical field of abrasive polishing and sintered body materials. Background technique [0002] α-alumina micropowder is one of the most widely used ceramic materials in various industries. It has strong acid and alkali resistance, good molding, stable crystal phase, high hardness and good dimensional stability. It can be widely used in various plastics, For products such as rubber, ceramics, and refractory materials, reinforcement and toughness are especially notable for improving the compactness, smoothness, creep resistance of ceramics, and wear resistance of polymer materials. Low-sodium ultrafine α-alumina powder is mainly used in various grinding and polishing, cutting tools and toughening precision alumina ceramics and various products produced by isostatic pressing. With the continuous development of science and technology, the phy...

Claims

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Application Information

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IPC IPC(8): C01F7/30
Inventor 李军虎张金龙田建刚周红军
Owner 晋城市富基新材料股份有限公司
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