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A macro-preparation method of solar-grade ultra-high-purity nano-silicon powder

A nano-silica fume, solar technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of consumption of silicon-containing raw materials, high recovery cost, low purity, etc., and achieves a simple, easy, and compatible preparation method. Good, suitable for promotion and application

Active Publication Date: 2017-12-19
JIA XING SHANGNENG PHOTOVOLTAIC MATERIALS SCI & TECH CO LTD
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Problems solved by technology

The above technologies all need to consume expensive silicon-containing raw materials, with low yield and low purity
[0004] At present, my country's solar-grade silicon ingot output exceeds 100,000 tons, and about half of the silicon powder is produced in the process of cutting the silicon ingot into silicon wafers. Although the purity of these micron-sized silicon powders is as high as 99.9999%, due to the mixing of other chemical substances , the recycling cost is high, and it is often treated as waste. It is urgent to find a technology that can increase the added value of waste silicon powder

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  • A macro-preparation method of solar-grade ultra-high-purity nano-silicon powder
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  • A macro-preparation method of solar-grade ultra-high-purity nano-silicon powder

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preparation example Construction

[0042] The invention discloses a macro-preparation method of solar-grade ultra-high-purity nano silicon powder. The method specifically includes the following steps:

[0043] S1. Use the flake silicon powder produced during the process of cutting solar-grade silicon ingots into silicon wafers by diamond wire as raw materials, and perform pretreatment;

[0044] Among them, the flake silicon powder has micron and submicron size, and the purity is 99.9999%.

[0045] The preprocessing in step S1 specifically includes:

[0046] First put the flake silicon powder into the HF solution with a mass percentage of 1-10% to remove SiO 2 For the oxide layer, the cleaning time is 60-1200 seconds, and the cleaning temperature is 5-30°C;

[0047] Then use deionized water to wash 3-5 times;

[0048] Put wet silica fume into N 2 Protective atmosphere furnace, drying at 120 ~ 200 ℃.

[0049] S2, putting the pretreated silicon powder into a first chemical solution containing metal ions, an o...

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Abstract

The invention discloses a macro-preparation method of solar-grade ultra-high-purity nano-silicon powder. ; put the pretreated silicon powder into the first chemical solution containing metal ions, oxidants and chemical cutting agents, and generate nano-silicon powder by chemical cutting; clean with the first cleaning solution, the second cleaning solution, and deionized water respectively Nano-silicon powder, remove the metal particles formed by nano-silicon powder; put the nano-silicon powder into the second chemical solution, and form spherical nano-silicon powder by microchemical etching; clean the spherical nano-silicon powder with deionized water, Dehydration in a high-speed centrifuge and drying in an N2 protective atmosphere can obtain solar-grade ultra-high-purity nano-silica powder. The invention adopts chemical cutting and micro-etching techniques to prepare ultra-high-purity nano-silicon powder with controllable size, which greatly improves the added value of solar-grade waste silicon powder recycling.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a macro-preparation method of solar-grade ultra-high-purity nano-silicon powder, which can be widely used in the fields of optoelectronics, energy, environmental protection, and functional materials. Background technique [0002] In recent years, nano silicon powder materials have been applied in many fields, such as solar silicon batteries in the new energy field, 3D printing silicon ink, lithium battery anode materials, etc.; Adhesion, photocatalysis, self-cleaning function, anti-mildew and sterilization, air purification, ultraviolet shielding and other functional nano-silicon coatings; also such as quantum dots and luminescent materials in the field of optoelectronics; and applied to silica gel, high-temperature resistant coatings, refractory materials , Preparation of nano-SiC, SiN and other functional materials. [0003] The commonly used preparation methods of nano-...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/021B82Y30/00
Inventor 苏晓东查嘉伟
Owner JIA XING SHANGNENG PHOTOVOLTAIC MATERIALS SCI & TECH CO LTD
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