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Method for grading silver powder for solar battery

A technology of solar cells and grading methods, applied in chemical instruments and methods, solid separation, wet separation, etc., can solve problems such as easy to cause danger, production accidents, low output, etc., and achieve improved safety, cost savings, and dispersion. Good results

Active Publication Date: 2015-04-08
JIANGSU BOQIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liquid phase classification generally uses water or organic solvents for solid-liquid separation. When organic solvents are used as the classification medium, the dispersion can meet the requirements for the use of electronic components, but the output is low, and most of the organic solvents are flammable and explosive. The product is easy to cause danger in the normal production process, resulting in production accidents, and the production cost is high; at the same time, if only deionized water is used as the grading medium, the dispersibility cannot meet the requirements of the powder.

Method used

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  • Method for grading silver powder for solar battery
  • Method for grading silver powder for solar battery
  • Method for grading silver powder for solar battery

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Nano-silver powder with an average particle size of 620nm prepared by PVD method is used as the raw material for classification, and it is added to the deionized aqueous solution of ammonium polyacrylate (the mass concentration of ammonium polyacrylate in the deionized aqueous solution of ammonium polyacrylate is 1%), the solid content is controlled at 15%.

[0028] (2) Use ultrasound and stirring to disperse the solid-liquid system, the dispersion time lasts for 40 minutes, and the temperature of the dispersed slurry is controlled at 30°C-35°C;

[0029] (3) Pass the dispersed solid-liquid system through a 600-mesh wire screen, and collect the slurry that has passed through the screen;

[0030] (4) Use a vertical centrifugal pump to transport the slurry to the hydrocyclone. The outlet pressure of the vertical centrifugal pump is controlled at 0.8Mpa, and the flow rate of the slurry at the inlet of the cyclone is controlled at 20m 3 / h, the slurry flow at the overfl...

Embodiment 2

[0037] (1) The nano-silver powder with an average particle size of 980nm prepared by PVD method is used as the raw material for classification, and it is added to the deionized aqueous solution added with ammonium polyacrylate, and the content of silver is controlled at 15%.

[0038] (2) Use ultrasound and stirring to disperse the solid-liquid system, the dispersion time lasts for 40 minutes, and the temperature of the slurry is controlled at 30°C-35°C;

[0039] (3) Pass the dispersed solid-liquid system through a 600-mesh wire screen;

[0040] (4) Use a vertical centrifugal pump to transport the slurry to the hydrocyclone. The outlet pressure of the vertical centrifugal pump is controlled at 1.5Mpa, and the flow rate of the slurry at the inlet of the cyclone is controlled at 24m 3 / h, the slurry flow at the overflow outlet of the cyclone is controlled at 2.2m 3 / h.

[0041] (5) Use SEM / PSD / BET (scanning electron microscope / laser particle size analysis / specific surface area ...

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Abstract

The invention discloses a method for grading silver powder for a solar battery, and the method comprises the following steps of: adding a dispersant agent to deionized water to prepare a 0.1%-2% by weight of dispersant agent water solutions; adding metal silver powder to the dispersant agent water solutions, and mixing into a solid-liquid system with solid content controlled at 1%-30% by weight; then carrying out mechanical dispersion to obtain uniformly dispersed slurry; collecting the slurry through a screen mesh of 40-600 meshes, adding to a stirring kettle, delivering to a hydraulic cyclone by using a booster pump, wherein the outlet pressure of the booster pump is controlled at 0.2-1.6 MPa, the inlet flow rate of the hydraulic cyclone is controlled at 5-30m<3> / h, and the overfall outlet flow rate of the hydraulic cyclone is controlled at 0.3-3m<3> / h; controlling the grading time of the hydraulic cyclone at 1-1.5 h, and collecting the slurry positioned on the overfall outlet of the hydraulic cyclone to obtain the silver powder for the solar battery. The method disclosed by the invention has the advantages of grading efficiency guarantee, simple process, low cost, safety and environmental friendliness and can ensure that the powder dispersibility meets the use requirement of the silver powder for the solar battery.

Description

technical field [0001] The invention relates to the technical field of metal powder classification, in particular to a method for classifying silver powder for solar cells. Background technique [0002] Silver powder is the most widely used and most used precious metal powder in the electronics industry. It is the most basic and key functional material for the production of electronic components, and the classification of silver powder is a key step to realize its wide application. [0003] At present, the preparation methods of silver powder at home and abroad include thermal decomposition method, electrochemical method, chemical reduction deposition method and physical vapor deposition method. [0004] PVD (Physical Vapor Deposition) method is a method of preparing metal nanopowder by physical method. The preparation of nano-silver powder also adopts this method, which is realized by vacuum evaporation, heating and high-frequency induction. The principle is to first vapo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B7/00B03B5/34B03B1/00
Inventor 王翠霞金贺元周峰王利平
Owner JIANGSU BOQIAN NEW MATERIALS
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