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Alumina slurry and preparation method and application thereof

An alumina and slurry technology, applied in the field of metal processing, can solve the problems of burrs, unfavorable dispersion, and small output of particles, achieve good dispersibility and stability, overcome false particle agglomeration, and be difficult to precipitate.

Pending Publication Date: 2021-01-01
MATRIX GUANGZHOU CHEM CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, high-quality alumina polishing powder is generally processed by jet mill, and the physical and chemical indicators of the powder are relatively stable, but jet mill processing consumes a lot of energy and the output is small, so wet grinding is often used for large-scale production of alumina polishing powder
However, the traditional wet grinding has the following problems: first, it is difficult to ensure that the particle size distribution can still be maintained in a narrow range at a small size of 1 μm, and the particles have burrs, so the product quality is not stable and balanced; second, the grinding The final product needs to be dried, and the dried powder will generally agglomerate, resulting in false particles, which are not conducive to dispersion during use and affect the actual use effect

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  • Alumina slurry and preparation method and application thereof
  • Alumina slurry and preparation method and application thereof
  • Alumina slurry and preparation method and application thereof

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preparation example Construction

[0039] The invention provides a kind of preparation method of aluminum oxide slurry, it comprises the following steps:

[0040] Step S1: ball milling the alumina raw material, solvent and dispersant to prepare the first grinding material, wherein the dispersant is a mixed dispersant containing at least two different components;

[0041] Step S2: sanding the first abrasive at least once until the particle size D50<1 μm and D99<3 μm, to prepare a second abrasive;

[0042] Step S3: The second abrasive is filtered to obtain a finished slurry.

[0043] In a specific example, the alumina raw material is calcined α-Al 2 o 3 , the calcination temperature is above 1600℃, α-Al 2 o 3 Content > 98%, total Al 2 o 3 The content is >99%, the primary grain size is <2 μm, preferably the primary grain size is <0.5 μm. It can be understood that in other embodiments, other raw materials with similar or higher specifications and grades can also be used.

[0044] Optionally, the solvent is ...

Embodiment 1

[0066] S1: Put 500kg of calcined α-Al into a horizontal ball mill with a diameter of 2200mm and a frequency modulation speed of 26RPM 2 o 3 , put into 3000kg of 99.99% alumina balls (diameter is 8mm) as grinding medium, drop into 2.4kg mixed dispersant (ethylene glycol 0.8kg+nonylphenol polyoxyethylene ether 0.8kg+maleic acid-styrene type modified copolymer 0.8kg), put in 928kg of water, transfer to intermediate storage tank A after grinding for 6 hours, connect hose pump, transfer to 50L sand mill;

[0067] S2: 99.99% alumina balls with a diameter of 0.8 mm are put into the sand mill as a grinding medium, and the amount used is 70% of the total volume. After sanding, if the particle size reaches the standard, filter it directly to obtain the finished product; if the particle size does not reach the standard, then grind the abrasive from the intermediate storage tank B to the intermediate storage tank C again through the sand mill, and filter after the particle size reaches t...

Embodiment 2

[0070] S1: Put 500kg of calcined α-Al into a horizontal ball mill with a diameter of 2200mm and a frequency modulation speed of 26RPM 2 o 3 , put into 4500kg of 99.99% alumina balls (diameter is 8mm) as grinding medium, drop into 2.72kg mixed dispersant (ethylene glycol 0.96kg+nonylphenol polyoxyethylene ether 0.8kg+maleic acid-styrene type modified copolymer 0.96kg), put in 928kg of water, transfer to intermediate storage tank A after grinding for 6 hours, connect hose pump, transfer to 50L sand mill;

[0071] S2: 99.99% alumina balls with a diameter of 0.8 mm are put into the sand mill as a grinding medium, and the amount used is 70% of the total volume. After sanding, if the particle size reaches the standard, filter it directly to obtain the finished product; if the particle size does not reach the standard, then grind the abrasive from the intermediate storage tank B to the intermediate storage tank C again through the sand mill, and filter after the particle size reache...

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Abstract

The invention relates to the technical field of metal processing, in particular to aluminum oxide slurry as well as a preparation method and application thereof. According to the invention, a two-stage grinding process including ball milling and sanding is adopted, and a proper mixed dispersing agent is selected, so that the obtained product has regular and smooth particle morphology, narrow particle size distribution and small particles; after precise filtering, a product is in the form of slurry and can be used without drying, so that the defect of agglomeration of false particles of the traditional aluminum oxide powder is overcome, and the aluminum oxide polishing powder has higher dispersity and stability, is not easy to precipitate, ensures the polishing effect, can replace high-quality aluminum oxide polishing powder processed by an airflow mill, and can be used for high-precision mirror polishing occasions such as stainless steel mirror polishing and sapphire mirror polishing.

Description

technical field [0001] The invention relates to the technical field of metal processing, in particular to an alumina slurry and its preparation method and application. Background technique [0002] In the polishing process, the average particle size of the polishing powder determines the polishing process that can be applied. Usually, the particle size of 20μm-45μm is used in the rough polishing process, the particle size of 4μm-20μm is used in the intermediate polishing process, the particle size of 1μm-4μm is used in the fine polishing process, and the particle size below 1μm is used in mirror polishing. [0003] At present, high-quality alumina polishing powder is generally processed by jet mill, and the physical and chemical indicators of the powder are relatively stable, but jet mill processing consumes a lot of energy and the output is small, so wet grinding is often used for large-scale production of alumina polishing powder . However, the traditional wet grinding h...

Claims

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Application Information

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IPC IPC(8): C01F7/02C09G1/02
CPCC01F7/023C09G1/02C01P2004/61C01P2004/03
Inventor 邓广兴肖飞易立群陈秀林李群锋廖国梁
Owner MATRIX GUANGZHOU CHEM CORP
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