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Method for preparing nano-sized spherical silicon micropowder by flame method

A spherical silicon micropowder, flame method, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve the problems of low powder particle packing density, great difficulty in industrialization, and high surface activity. High bulk density, not easy to agglomerate and agglomerate, and low surface activity

Active Publication Date: 2017-08-18
中南冶金地质研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a method for preparing nano-spherical silicon micropowder by flame method, the purpose of which is to solve the technical gaps in the preparation of nano-spherical silicon micropowder by domestic physical methods, and the existing The use of a large number of chemical reagents in the preparation of nano-spherical silica powder by chemical methods leads to technical problems such as long process flow, large investment, serious environmental pollution, and difficult industrialization, and the powder particles prepared by chemical methods have low packing density and high surface activity. , easy to agglomerate and agglomerate and other shortcomings

Method used

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  • Method for preparing nano-sized spherical silicon micropowder by flame method
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  • Method for preparing nano-sized spherical silicon micropowder by flame method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Using vein quartz as raw material, D 90 =4.33μm; use acetylene as the fuel gas and oxygen-enriched air as the combustion-supporting gas, control the temperature of the burner at 1900°C, and spheroidize; mix the collected powder with pure water according to the solid-liquid weight ratio of 1:5, and add 0.05 % silicone oil, stir evenly and transfer to the omni-directional planetary mill, then add zirconia grinding medium according to the volume ratio of 2:1 medium and slurry, set the speed at 400r / min, and run for 60 minutes; separate the medium balls, and put the slurry Mix with absolute ethanol according to the volume ratio of slurry and ethanol at 1:1, stir at high speed to disperse evenly, and age for 48 hours. Suck out all the suspended slurry, disperse at a high speed, and then transfer it to a supergravity separator, set the rotation speed at 3500r / min for 20 minutes. The precipitate was extracted and analyzed by a scanning electron microscope (SEM for short), to ...

Embodiment 2

[0050] Using vein quartz as raw material, D 90 =2.84μm; use hydrogen as the fuel gas and oxygen-enriched air as the combustion-supporting gas, control the temperature of the burner at 1850°C, and carry out spheroidization; mix the collected powder with pure water according to the solid-liquid weight ratio of 1.5:10, and add 0.2 % Dispersant LT560, after stirring evenly, transfer it to the stirring mill, then add zirconia grinding media according to the volume ratio of 3:2 media and slurry, set the speed at 380r / min, and run for 45 minutes; separate the media balls, and put the slurry Mix methanol according to the volume ratio of slurry and methanol at 1:1, stir at high speed to disperse evenly, and age for one week. Suck out all the suspended slurry, disperse at a high speed, and transfer it to a supergravity separator, set the rotation speed at 8500r / min for 15 minutes. The precipitate was extracted and analyzed by SEM to obtain spherical silicon micropowder particles with a...

Embodiment 3

[0052] Using vein quartz as raw material, D 90 =2.51μm; use liquefied petroleum gas as fuel gas and oxygen as combustion-supporting gas, control the temperature of the burner at 1800°C, and carry out spheroidization; mix the collected powder with pure water according to the solid-liquid weight ratio of 1:4, and add 1.2 % water glass, stir evenly and transfer to the omnidirectional planetary mill, then add zirconia grinding medium according to the volume ratio of 2:1 medium and slurry, set the speed at 400r / min, and run for 60 minutes; separate the medium balls, and put the slurry The material is mixed with ethanol+methanol (1+1) mixed solvent according to the volume ratio of slurry and mixed solvent at 1:2, stirred at high speed to disperse evenly, and aged for 100h. Suck out all the suspended slurry, disperse at a high speed, and then transfer it to a supergravity separator, set the rotation speed at 10000r / min for 5 minutes. The precipitate was extracted and analyzed by SEM...

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Abstract

The invention discloses a method for preparing a nano-sized spherical silicon micropowder by a flame method. The method comprises the following steps: with natural vein quartz as a raw material, purifying, making sand, performing ultrafine grinding, grading, and then spheroidizing the graded ultrafine quartz powder through combustion in a down-draft combustion device; under the action of water and other dispersing agents, grinding the spheroidized powder by using a stirring mill, a planetary mill, or a sand mill or other machinery, and then aging; separating an aged and layered slurry to obtain a lower concentrated slurry and an upper suspended slurry respectively; diluting the suspended slurry by using a water-soluble solvent, putting into a supergravity separation device, performing supergravity precipitation separation for a fixed time of 3-60min at a fixed speed of 3000-13000r / min, extracting precipitate to obtain nano-sized spherical silicon micropowder particles with different particle sizes. By the method, submicron-sized and nano-sized spherical silicon micropowder particles with different particle size distribution ranges of 30-1200nm and smooth surfaces can be obtained respectively, the spherical degree thereof is 99% or above, and the spheroidizing rate is 100%.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic functional materials, and more specifically relates to a method for preparing nano-spherical silicon micropowder using a flame method. Background technique [0002] Nanotechnology is recognized as the most promising and most influential high-tech in the 21st century. Nanoscale spherical silica powder is one of the important members of nanomaterials. Due to its small particle size, large specific surface area, large surface energy, high chemical purity, and good dispersibility, it has high melting point, low expansion coefficient, low water absorption, and high dielectric strength. Many specific thermal, optical, electrical and magnetic properties, such as electrical constant and low friction coefficient, are an ideal high-quality filling material and special spraying material for electronic appliances and chemical products, and are used to manufacture nano-ceramics and ultra-large-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B33/12C01P2004/03C01P2004/32C01P2004/51C01P2004/61C01P2004/62C01P2004/64
Inventor 胡修权贺爱平郭茂生汪超李国栋张立尤大海
Owner 中南冶金地质研究所
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