HIT solar cell recycling pretreatment method

A solar cell and pretreatment technology, applied in chemical instruments and methods, silicon compounds, silicon oxides, etc., can solve the problems of numerous impurities, rare metal indium recovered, affecting the recovery of indium, silver and silicon wafers, etc. The effect of reducing silver loss and waste, reducing demand burden

Inactive Publication Date: 2019-09-24
HOHAI UNIV CHANGZHOU
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Problems solved by technology

At present, the research on indium recovery at home and abroad is mainly based on the recovery of indium from indium-containing smelting waste residue, smoke dust, and indium-containing waste ITO targets, while the research on the recovery of metal indium from transparent condu

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  • HIT solar cell recycling pretreatment method
  • HIT solar cell recycling pretreatment method
  • HIT solar cell recycling pretreatment method

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Embodiment Construction

[0026] The present invention will be further described below. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0027] In order to realize the pretreatment of waste HIT solar cells, the present invention provides a method for pretreatment of HIT solar cells, see figure 1 , follow the steps below:

[0028] 1. HIT battery pretreatment

[0029] Select a piece of waste single-sided HIT solar cell, the size of the silicon cell is 155x155mm, and the flat angle is 15mm; the aluminum back plate is 157x157mm, and the flat angle is 13mm; the weight of the whole battery is 9.708g, and the overall thickness is about 200mm. It is cut and broken into larger sub-blocks by cutting machine.

[0030] Measure 90ml of deionized water with a measuring cylinder and pour it into a beaker, weigh 10g of caustic soda (sodium hydroxide) and add it to the beaker for mixing, ...

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Abstract

The invention discloses a HIT solar cell recycling pretreatment method. The method comprises the following steps that back aluminum, an aluminum silicon alloy and a silver electrode of an HIT solar cell are removed with a sodium hydroxide solution, a silicon nitride anti-reflection layer and the silver electrode are removed with hydrofluoric acid, silicic acid is dissolved with sodium hydroxide, air is introduced into the silicic acid to extract the silicic acid, and silica is generated after water loss; and the silver electrode is dissolved with the nitric acid, sodium chloride is added, AgCl+ precipitate is obtained, and silver is obtained after iron powder replacement. By the adoption of the method, the waste HIT solar cell and silver powder which are convenient for subsequent indium recovery are obtained and can be directly used as a raw material in the indium recovery process and a raw material for silver recycling.

Description

technical field [0001] The invention discloses a HIT solar cell recycling pretreatment method, which belongs to the technical field of photovoltaic material recycling. Background technique [0002] The HIT solar cell is based on N-type doped single crystal silicon as the substrate, with a thin layer of amorphous silicon layer on the upper and lower layers, and the top layer is P-type amorphous silicon that forms a PN junction with the N-type substrate for photoelectric conversion. ; There is a bottom-type amorphous silicon with a greater doping concentration than the N-type substrate, and the TCO conductive glass (idealized) that plays the dual role of light transmission and anti-reflection is the upper and lower sides, and is screen-printed on the outermost made of silver electrodes. For discarded HIT solar cells, there is still a lot of recycling value: the rare metal indium present in the TCO conductive glass, the silicon wafers, and the silver in the electrodes. At pre...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00C22B58/00C01B33/12
CPCC01B33/12C01B33/122C22B7/006C22B11/046C22B58/00Y02P10/20
Inventor 于书魁王磊潘威衡李韫良张臻卢奕鑫邰正琪
Owner HOHAI UNIV CHANGZHOU
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