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Method for preparing nanometer silicon powder

A technology of nano-silicon powder and silicon powder, which is applied in the field of preparation of nano-silicon powder, can solve problems such as nano-silicon powder electrode pollution, and achieve the effects of avoiding surface oxidation and moisture absorption, good fluidity and dispersion, and large specific surface area

Active Publication Date: 2016-12-07
CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention patent with the publication number CN102910630A discloses a method for preparing nano-silicon powder by DC arc plasma method. Evaporation, so the prepared nano-silicon powder has electrode pollution

Method used

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  • Method for preparing nanometer silicon powder
  • Method for preparing nanometer silicon powder

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 1) Load the raw silicon powder with an average particle size of 4 microns and a maximum particle size of no more than 50 microns into the feeder, and then flush and leak check the preparation system with argon;

[0034] 2) Pass sheath gas (argon gas 25slpm, hydrogen gas 1.7slpm) and center gas (argon gas 6slpm) into the high-frequency plasma generator, adjust the system pressure to 27.6Kpa, turn on the high-frequency power supply and excite the plasma, and then The cooling area is quickly filled with argon gas, and the axial cooling airflow is adjusted to 50slpm, the radial cooling airflow is 75slpm, and the system air pressure is gradually adjusted to 103.4Kpa, and the system power is adjusted to 14KW;

[0035] 3) After the system is stable, turn on the feeder to start feeding at a rate of 0.5g / min and feed argon gas with a flow rate of 4 slpm into the feeder, and the raw silicon powder passes through the high-frequency plasma under the carrier gas (argon gas) The plas...

Embodiment 2

[0039] Repeat Example 1, the difference is:

[0040] In step 1), silicon powder with an average particle size of 12 microns and a maximum particle size of no more than 50 microns is used as a raw material;

[0041] In step 2), feed sheath gas (argon 50slpm, hydrogen 4slpm) and center gas (argon 6slpm) into the high-frequency plasma generator, adjust the system pressure to 34.5Kpa, turn on the high-frequency power supply and excite the plasma, Then quickly pass argon into the cooling area, and adjust the axial cooling airflow to 80slpm, the radial cooling airflow to 140slpm, gradually adjust the system air pressure to 110.2Kpa, and adjust the system power to 40KW;

[0042] In step 3), the speed of the feeder is 6g / min, and the flow rate of the carrier gas is 5slpm.

[0043] The nano-silicon powder prepared in this example is light yellow powder, the particle shape is spherical or nearly spherical, and the specific surface area is 37.1m 2 / g, the average particle diameter is 6...

Embodiment 3

[0045] Repeat Example 1, the difference is:

[0046] In step 1), silicon powder with an average particle size of 18 microns and a maximum particle size of no more than 50 microns is used as a raw material;

[0047] In step 2), feed the sheath gas (argon gas 200slpm, hydrogen gas 24slpm) and center gas (argon gas 80slpm) into the high-frequency plasma generator, adjust the system pressure to 27.6Kpa, turn on the high-frequency power supply and excite the plasma, Then quickly pass argon into the cooling area, adjust the axial cooling airflow to 150slpm, and the radial cooling airflow to 380slpm, gradually adjust the system air pressure to 117.1Kpa, and adjust the system power to 180KW;

[0048] In step 3), the speed of the feeder is 50 g / min, and the flow rate of the carrier gas is 8 slpm.

[0049] The nano-silicon powder prepared in this example is a light yellow powder, the shape of the particles is spherical or nearly spherical, and the specific surface area is 92.1m 2 / g, ...

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Abstract

The invention discloses a method for preparing nanometer silicon powder. The nanometer silicon powder is made of coarse silicon powder. Inert gas is used as carrier gas. The method includes carrying the coarse silicon powder by the carrier gas, allowing the coarse silicon powder to penetrate plasmas generated by a high-frequency plasma generator and feeding the coarse silicon powder into a reaction chamber; quickly gasifying the coarse silicon powder in high-temperature plasma regions in the reaction chamber to generate silicon atom steam cloud; forming tiny silicon particles by the generated silicon atom steam cloud under the effects of cooling gas flow when the silicon atom steam cloud flows through cooling regions; driving the silicon particles by gas flow to flow into a cyclone classification chamber; detaining the classified coarse silicon particles in the cyclone classification chamber; carrying the fine silicon particles into a gas-solid separation chamber by the aid of the gas flow; ultimately depositing the fine silicon particles on a filter of the gas-solid separation chamber; collecting the silicon particles on the filter to obtain the nanometer silicon powder. The method has the advantages that the induction plasmas are used as heat sources, accordingly, electrode pollution can be prevented in preparation procedures, the nanometer silicon powder prepared by the aid of the method is high in purity, and the particles are in spherical or approximately spherical morphology, have large specific surface areas and are high in surface activity and good in flowability and dispersibility.

Description

technical field [0001] The invention relates to a method for preparing silicon powder, in particular to a method for preparing nanometer silicon powder. Background technique [0002] As an important semiconductor material, silicon plays an extremely important role in the information revolution. With the advancement of social civilization and science and technology, human society has entered the nanometer era. When the silicon material is transformed to the nanoscale, it is endowed with new properties. As an emerging material, nano-silica powder has huge potential market and application prospects in the fields of lithium battery negative electrode materials, photovoltaic materials, ceramic materials, composite materials, and catalytic materials. For example, adding a certain proportion of nano-silicon powder to the carbon negative electrode of lithium-ion batteries to make silicon-carbon negative electrode composite materials can replace traditional carbon negative electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/021B82Y40/00
CPCC01B33/021C01P2004/03C01P2004/64C01P2006/12
Inventor 秦海青张振军刘文平林峰卢宗柳张健伟雷晓旭蒙光海卢安军
Owner CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD
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