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Method for screening micro-nano powder

A micro-nano, powder technology, used in chemical instruments and methods, sieves, solid separation, etc., can solve difficult particle size fine sieving, impossible to achieve powder sieving, difficult to achieve medium and large particle sieves grading problem

Inactive Publication Date: 2021-04-13
佛山(华南)新材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, sedimentation classification is used to realize powder classification. Specifically, small particle powders will float on the solvent surface, medium particle powders will be suspended in the solution, and then slowly descend after standing for a period of time. Large particle powders will Rapid sinking is used to obtain large particle fractions, but it is difficult to sieve medium and large particles in sedimentation classification, and the most is to remove small floating particles
The minimum pore size of commercial vibrating sieves is 30 microns, and the classification of vibrating sieves cannot achieve the screening of powders below 30 microns
However, the traditional airflow classification is difficult to achieve fine sieving of particle size. Vibration sieving powder particles can only sieve particles above 30 microns, and there is a risk of dust pollution or even dust explosion in the sieving process.

Method used

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  • Method for screening micro-nano powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a spherical alumina finely screened powder, which is prepared according to the following steps:

[0040] (1) Add 50g D50=15μm spherical alumina into 300g water, and disperse for 1min with an ultrasonic disperser to obtain a suspension;

[0041] (2) The suspension obtained in step (1) is gradually added to a metal sieve cylinder with a diameter of 10cm and a height of 10cm. The aperture of the screen at the bottom of the metal sieve cylinder is 20 μm, and the frequency of the application is 20K, ultrasonic waves with a power of 500W, and the ultrasound is classified to All the suspension passes through the sieve to the receiving container;

[0042] (3) vacuum filter the suspension obtained in step (2) until only powder particles remain;

[0043] (4) Put the powder particles obtained in step (3) into an oven and heat at 100° C. for 30 minutes to obtain a finely screened powder.

Embodiment 2

[0045] This embodiment provides a spherical alumina finely screened powder, which is prepared according to the following steps:

[0046] (1) Add 50g D50=5μm spherical alumina to 300g ethanol, and disperse for 1min with an ultrasonic disperser to obtain a suspension;

[0047] (2) The suspension obtained in step (1) is gradually added to a metal sieve cylinder with a diameter of 15 cm and a height of 15 cm. The aperture of the screen at the bottom of the metal sieve cylinder is 10 μm, and the applied frequency is 20K and ultrasonic waves with a power of 500W. Ultrasonic classification to All the suspension passes through the sieve to the receiving container;

[0048] (3) vacuum filter the suspension obtained in step (2) until only powder particles remain;

[0049] (4) Put the powder particles obtained in step (3) into an oven and heat at 80° C. for 30 minutes to obtain a finely screened powder.

Embodiment 3

[0051] This embodiment provides a spherical alumina finely screened powder, which is prepared according to the following steps:

[0052] (1) Add 50g D50=3μm spherical alumina into 500g cyclohexane, and disperse for 1min with an ultrasonic disperser to obtain a suspension;

[0053] (2) The suspension obtained in step (1) is gradually added to a metal sieve cylinder with a diameter of 20 cm and a height of 20 cm. The aperture of the screen at the bottom of the metal sieve cylinder is 5 μm. The frequency of the application is 20K and the power is 500W. All the turbid liquid reaches the receiving container through the screen;

[0054] (3) vacuum filter the suspension obtained in step (2) until only powder particles remain;

[0055] (4) Put the powder particles obtained in step (3) into an oven and heat at 80° C. for 30 minutes to obtain a finely screened powder.

[0056] Effect comparison example

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Abstract

The invention discloses a method for screening micro-nano powder, which comprises the following steps that: the micro-nano powder is mixed with a solvent and disperses to form turbid liquid; the turbid liquid is added into a separation device with a screen, wherein the mesh of the screen is micron-sized or nano-sized; and ultrasonic waves are applied to the separation device, screening is conducted to obtain screening liquid, solid-liquid separation is conducted on the screening liquid, solids are dried after separation, and fine screened powder is obtained. According to the method, through the cavitation effect generated by the ultrasonic waves in a liquid medium, the liquid carries the micro-nano powder to quickly pass through the screen, fine screening of micro-nano particles and D100 precise control are achieved, and the risk of dust pollution and even dust explosion does not exist in the screening process.

Description

technical field [0001] The invention relates to a sieving method for micro-nano powders, in particular to a method for sieving micro-nano powders. Background technique [0002] The particle size of powder particles is usually distributed normally, and the particle size of powder is not uniform. However, application fields such as thermal conductive composite materials and conductive composite materials usually have higher requirements for inorganic fillers, and in more high-end application fields, more stringent requirements are put forward for the particle size of powder particles. It is particularly important to carry out deep processing of nano powder. In the prior art, sedimentation classification is used to realize powder classification. Specifically, small particle powders will float on the solvent surface, medium particle powders will be suspended in the solution, and then slowly descend after standing for a period of time. Large particle powders will Rapid sinking ...

Claims

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Application Information

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IPC IPC(8): B07B1/28B07B1/46
CPCB07B1/28B07B1/46B07B2230/01B07B2230/04
Inventor 崔巍
Owner 佛山(华南)新材料研究院
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