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A kind of preparation method of nano silicon powder, prepared nano silicon powder and application

A technology of nano silicon powder and silicon powder, applied in the direction of nano technology, silicon, structural parts, etc., can solve the problems of high equipment requirements, poor uniformity, complex process flow, etc., and achieve the goal of saving natural resources, improving competitiveness, and simple process Effect

Active Publication Date: 2022-06-10
LUOYANG CSI PHOTOVOLTAIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the mixed solution of hydrofluoric acid / nitric acid is used in the preparation process, which will cause certain harm to the environment, and the obtained silicon powder has a large particle size and poor uniformity.
[0006] CN 109037665A discloses a method for preparing nano-silicon negative electrode materials by utilizing waste silicon slag in the photovoltaic industry, including: 1) primary purification: using waste silicon slag in the photovoltaic industry as raw material, using a pulverizer to crush the easily agglomerated material to below 2mm , to obtain waste silicon powder, which is then treated with acid, filtered or centrifuged, washed with deionized water until neutral, and dried; 2) Secondary purification: use a pulverizer to crush the silicon powder material after the primary purification to below 2mm, and then transfer to In a tube furnace or a box furnace, calcined in an inert atmosphere at a certain temperature to obtain secondary purified silicon powder; 3) Coarse powder treatment: using secondary purified silicon powder as raw material, under the protection of an inert atmosphere, Using a pulverizer, after grading and sieving, obtain silicon micropowder with D90 less than 50 μm; fine powder treatment: use an inert solvent and add grinding aids on a fully enclosed nano-grinding machine under an inert atmosphere to perform fine powder to obtain nano-silicon Suspension; 5) Drying: The above suspension is dried by a spray dryer to obtain nano-silicon particles, that is, nano-silicon negative electrode material, but its equipment requirements are high, the process is complicated, and the preparation cost is low, so it is not easy to process nano-silicon powder. mass production of

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  • A kind of preparation method of nano silicon powder, prepared nano silicon powder and application
  • A kind of preparation method of nano silicon powder, prepared nano silicon powder and application
  • A kind of preparation method of nano silicon powder, prepared nano silicon powder and application

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preparation example Construction

[0060] The invention provides a kind of preparation method of nano silicon powder, and described preparation method comprises the following steps:

[0061] (1) taking waste silicon slag as raw material, and heat-treating it;

[0062] (2) mixing the silicon powder, balls and ball milling media after the heat treatment in step (1), and carrying out ball milling;

[0063] (3) drying the ball-milled slurry, then repeating the heat treatment described in step (1) at least once to obtain nano silicon powder;

[0064] Wherein, the ball milling medium in step (2) includes ethanol, cutting fluid and ethylene glycol.

[0065] The preparation method of the above-mentioned nano-silicon powder will be further described below in combination with specific examples.

[0066] Part of the specific embodiment uses the same waste silicon slag, all of which use a diamond wire with a wire diameter of 65 μm to cut high-purity crystalline silicon waste to obtain silicon powder. The silicon powder i...

Embodiment 1

[0068] First, use an electronic balance to weigh 100g of silicon slag, put it into a mortar and grind it, put the ground silicon slag into a beaker, put it in a vacuum drying oven, and keep it at 110°C for 5 hours until it is completely dry; The silicon slag is sized with a 100-mesh sieve, and the sized silicon slag is put into a graphite crucible and put into the atmosphere furnace together. After holding at 550°C for 80 minutes until the organic matter on the surface of the silicon slag is completely decomposed, it is then cooled to room temperature with the furnace and taken out for use.

[0069] Then, take by weighing heat-treated silicon slag 28g, according to powder: ball: the ratio that material is 1:15:3 takes by weighing 420g diameter and is the grinding ball of 1mm, and the total amount of grinding medium is 84g, wherein dehydrated alcohol, cutting Liquid and ethylene glycol are measured according to the ratio of 300:1:6, which are 82g of absolute ethanol, 0.27g of c...

Embodiment 2

[0073] First, use an electronic balance to weigh 200g of silicon slag, put it into a mortar and grind it, put the ground silicon slag into a beaker, put it in a vacuum drying oven, and keep it at 110°C for 5 hours until it is completely dry; The silicon slag is sized with a 100-mesh sieve, and the sized silicon slag is put into a graphite crucible and put into the atmosphere furnace together. After holding at 550°C for 80 minutes until the organic matter on the surface of the silicon slag is completely decomposed, it is then cooled to room temperature with the furnace and taken out for use.

[0074]Then, weigh 56g of heat-treated silicon slag, and weigh 840g of grinding balls with a diameter of 1mm according to the ratio of powder:ball:material to 1:15:3, and the total amount of grinding media is 168g, including absolute ethanol, cutting Liquid and ethylene glycol are measured in a ratio of 300:1:6, respectively 164g absolute ethanol, 0.55g cutting fluid and 3.28g ethylene gly...

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Abstract

The invention discloses a method for preparing nano-silicon powder, which is characterized in that the method comprises the following steps: 1) using waste silicon slag as a raw material to heat-treat it; 2) heat-treated silicon powder, grinding balls and Mix the ball milling media and perform ball milling; 3) dry the ball milled slurry, and then repeat the heat treatment described in step 1) at least once to obtain nano-silicon powder; wherein, the ball milling media includes ethanol, cutting fluid and ethylene glycol . The invention can prepare high-purity nano-silicon powder with uniform particle size on a large scale by using waste silicon slag, and has the advantages of low cost, simple process and mass production.

Description

technical field [0001] The present invention relates to a preparation method of nano-silicon powder, the prepared nano-silicon powder and its application, in particular to a method for preparing nano-silicon powder by using waste silicon slag produced in the photovoltaic industry, the prepared nano-silicon powder and its application. Background technique [0002] Silicon is one of the important industrial raw materials for the development of contemporary information technology. Silicon is an indirect bandgap semiconductor, and its unique properties have become the basis for the development of industries such as solar cells, cermets, and optical fibers, and thus have great application potential in the fields of national defense, aerospace, and energy. When the material is transformed to the nanometer scale, new properties will be given to the silicon material due to the size effect. [0003] Due to the characteristics of small size effect, quantum effect, and surface effect,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/02B82Y40/00C10M161/00H01M4/38
CPCC01B33/02B82Y40/00C10M161/00H01M4/386C10M2209/103C10M2207/16C10M2219/044C10M2209/104C10M2207/021C10M2207/128C10M2215/042Y02E60/10
Inventor 刘笃笃翟传鑫李飞龙朱军熊震康志华周新亮李煜燚
Owner LUOYANG CSI PHOTOVOLTAIC TECH CO LTD