Treatment method of broken materials of solar silicon cell pieces

A technology of silicon cells and processing methods, which is applied in the field of solar silicon industry, can solve problems such as shortage of raw materials, residual compounds, failure to meet the standard for re-smelting, etc., and achieve the effects of good removal, quality assurance, and increased availability

Inactive Publication Date: 2011-05-25
KAIFENG WANSHENGXIN MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the solar silicon industry, the silicon cell fragments are broken and broken due to work mistakes and other reasons when the components are welded to the aluminum strip. They cannot meet the use mark of the next process and are treated as waste.
In order to reuse the waste, the traditional treatment method for silicon cell scr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0028] Embodiment: Take the scraps of battery slices, and carry out the following steps in sequence:

[0029] a. Soak the battery pieces in 40% industrial grade hydrofluoric acid solution for more than 12 hours to remove the metal objects on the surface;

[0030] b. Soak in the mixed solution of hydrofluoric acid and ammonium fluoride. The composition of the mixed solution is: by weight, hydrofluoric acid: ammonium fluoride = 65-90%: 35-10%; rinse until the pH value is neutral ;

[0031] c. Soak in 36% industrial grade hydrochloric acid solution for more than 12 hours, rinse until the pH value is neutral;

[0032] d Soak in the mixed solution of nitric acid, hydrochloric acid and hydrofluoric acid, the composition of the mixed solution is: by weight, nitric acid: hydrochloric acid: hydrofluoric acid = 20:70:10; rinse until the pH value is neutral , forming a bare chip; soaking in a mixture of nitric acid, hydrochloric acid and hydrofluoric acid, rinsing until the pH value is...

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PUM

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Abstract

The invention discloses a treatment method of broken materials of solar silicon cell pieces, and relates to the treatment method of the broken materials of the solar silicon cell pieces. The method comprises the following steps in sequence: a. the broken materials of the cell pieces are put into hydrofluoric acid liquid and soaked for 10-15 hours; b. then the broken materials are soaked in mixed liquid of hydrofluoric acid and ammonium fluoride, wherein the mixed liquid comprises the following components in percentage by weight: the ratio of the hydrofluoric acid and the ammonium fluoride is equal to 65-90%:35-10%; c. the broken materials are put into hydrofluoric acid liquid and soaked; d. the broken materials are put into mixed liquid of nitric acid, hydrochloric acid and hydrofluoric acid and soaked; e. the broken materials are arranged into sodium hydroxide solution; f. the broken materials are put into an ultrasonic cleaning groove for cleaning; and g. the broken materials are dewatered and put into a baking oven for drying. The method has the beneficial effects that compared with the traditional treatment method, metals on the broken materials of the cell pieces are better removed, the mass conforms to the cleaning requirements of the solar silicon industry completely, the quality is ensured, and the availability ratio of raw materials is increased; and after cleaning, waste acid and rinsing liquid are treated and then discharged, so no pollution is caused to the environment.

Description

technical field [0001] The invention relates to the technical field of solar silicon industry, and further relates to a method for processing scraps of solar silicon cells. Background technique [0002] In the solar silicon industry, the scraps of silicon cells are broken and broken due to work mistakes and other reasons when the components are welded to aluminum strips. They cannot meet the use marks of the next process and are treated as waste. In order to reuse the waste, the traditional treatment method for silicon cell scrap is to wash it with a mixture of nitric acid and hydrofluoric acid after soaking. As a result of this treatment, there will be residual compounds after cleaning, which cannot meet the standard for reprocessing. [0003] On the one hand, it is the shortage of raw materials, on the other hand, it is the underutilization of the scraps of coating film. Therefore, it is very necessary to develop a technology that makes full use of silicon battery chips. ...

Claims

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Application Information

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IPC IPC(8): C01B33/037
Inventor 霍立孙志刚贾金有
Owner KAIFENG WANSHENGXIN MATERIALS
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