Preparation method of low-specific surface area submicron aluminum oxide

A low specific surface area, aluminum oxide technology, applied in chemical instruments and methods, inorganic pigment treatment, dyeing physical treatment, etc., can solve the problems of α crystal form damage annealing, water (oil) value increase, fluidity deterioration, etc. , to achieve the effect of small difference in particle size and specific surface area, smooth and round product surface, and increased process stability

Active Publication Date: 2018-10-30
雅安百图高新材料股份有限公司
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Problems solved by technology

At the same time, it will cause part of the α crystal form to be destroyed and annealed, and the XRD pattern can show the phenomenon of crystallization peak broadening
After grinding, the surface of the product is rough, and the wat

Method used

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  • Preparation method of low-specific surface area submicron aluminum oxide
  • Preparation method of low-specific surface area submicron aluminum oxide
  • Preparation method of low-specific surface area submicron aluminum oxide

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Embodiment 1

[0032] The technical scheme adopted in the present invention is:

[0033] The preparation method of submicron aluminum oxide with low specific surface area is characterized in that it comprises the following steps:

[0034] S1. Raw material selection

[0035] Use conventional calcined alumina on the market, the crystal form is α crystal form, the alumina content is greater than 99%, and the original grain size is less than 1 μm;

[0036] S2. Grinding

[0037] The calcined alumina is ground to a median particle size of 0.1-1 μm by wet ball milling, and the equipment used is a horizontal sand mill;

[0038] S3. drying

[0039] Spray drying wet ground alumina;

[0040] S4. Low temperature calcination

[0041] The dried alumina is calcined at 1000~1200°C; through low-temperature calcination, the rough surface after grinding is modified to be smoother and rounder, which promotes the restoration of the α crystal form and greatly reduces the specific surface area of ​​the ground...

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Abstract

The invention discloses a preparation method of low-specific surface area submicron aluminum oxide. The preparation method is characterized by comprising the following steps: S1, selecting a raw material: taking the conventional calcined aluminum oxide in the market, wherein the crystal form is an alpha crystal form and the aluminum oxide content is higher than 99%; S2, grinding: grinding the calcined aluminum oxide till the median particle size of 0.1-1 micron by a wet ball milling technology; S3, drying: drying the aluminum oxide treated by the wet ball milling technology to remove moisture;S4, calcinating at low temperature: calcinating the dried aluminum oxide at 900-1200 DEG C; S5, crushing: crushing the aluminum oxide calcinated at low temperature by a dry crushing technology, namely depolymerizing a product after low-temperature calcination till a submicron scale in the form of original crystal grains to obtain a finished product. The invention provides the preparation method of low-specific surface area submicron aluminum oxide, which is simple and easy to implement and by which the product quality is stable and scale production can be achieved.

Description

technical field [0001] The invention relates to the technical field of alumina powder preparation, in particular to a method for preparing submicron alumina with a low specific surface area. Background technique [0002] Submicron alumina has excellent insulation properties, chemical stability, high temperature resistance, and excellent thermal conductivity, with a thermal conductivity as high as 30W / (K m), and is widely used as a heat dissipation filler for electronic products. The development of thinner and thinner modern electronic products and the increase in computing speed require fillers to enhance heat dissipation, which is generally achieved by increasing the amount of fillers added. Technically, submicron alumina fillers are required to have a lower ratio and adapt to a higher filling ratio. [0003] In addition, with the continuous improvement of the capacity of lithium-ion rechargeable batteries, the energy stored inside is increasing. When charging and dischargi...

Claims

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Application Information

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IPC IPC(8): C08K9/00C08K3/22C08J7/06C09C1/40C09C3/04
CPCC08J7/06C08K3/22C08K9/00C08K2003/2227C08K2201/006C09C1/407C09C3/041C09C3/043
Inventor 郭庆杨强
Owner 雅安百图高新材料股份有限公司
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