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Processing method of coating film crushed materials of solar silicon cell

A processing method and technology for silicon cells, applied in the field of solar silicon industry, can solve the problems of shortage of raw materials, residual compounds, and inability to meet the standard of re-returning, and achieve the effects of realizing reuse, convenient use and increasing availability.

Inactive Publication Date: 2012-06-20
KAIFENG WANSHENGXIN MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The result of this treatment is that there will be residual compounds after cleaning, which cannot meet the standard for re-melting
[0004] On the one hand, there is a shortage of raw materials, and on the other hand, the underutilization of coating scraps

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0028] Embodiment: get the coated sheet fragments, carry out the following steps successively:

[0029] a. Soak the scraps of coated film in 40% industrial-grade hydrofluoric acid solution for 12 hours, and rinse until the pH value is neutral;

[0030] b. Soak in 36% industrial grade hydrochloric acid solution for 12 hours, rinse until the pH value is neutral;

[0031] c is soaked in the mixed solution of nitric acid, hydrochloric acid and hydrofluoric acid, and the soaking time is 12 hours. The composition of the mixed solution is: by weight, nitric acid:hydrochloric acid:hydrofluoric acid=20:70:10; Until the PH value is neutral, a bare chip is formed;

[0032] d put the bare chip in the corrosion solution, the corrosion solution refers to sodium hydroxide plus water to prepare a 30% solution by weight percentage, the time is 3 minutes, after the alkali treatment is completed, rinse until the pH value is neutral;

[0033] e Put it into the ultrasonic cleaning tank for clean...

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PUM

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Abstract

The invention relates to a processing method of coating film crushed materials of a solar silicon cell. The processing method sequentially comprises the following steps of: a, placing the coating film crushed materials into a hydrofluoric acid solution for soaking; b, placing into a hydrochloric acid solution for the soaking; c, placing into a mixed solution of nitric acid, hydrochloric acid and hydrofluoric acid for soaking; d, placing into a sodium hydroxide solution for soaking; e, placing into an ultrasonic cleaning tank for cleaning; and f, dewatering after ultrasonic cleaning and then placing into a drying oven for drying. Compared with the traditional processing method, the processing method has the remarkable effects of completely meeting the cleaning requirements of a solar silicon industry on the quality and ensuring the quality, thereby realizing the reuse of waste materials and enhancing the availability of raw materials; and after cleaning is completed, waste acids and bleaching liquor are treated and then drained without polluting environment.

Description

technical field [0001] The invention relates to the technical field of solar silicon industry, and further relates to a processing method for solar silicon cell coating scraps. Background technique [0002] In the solar silicon industry, in the process of making solar cells, silicon bare chips that fail to meet the standard or artificially damaged fragments and leftovers form the coated film of the present invention, which are usually collected and treated as waste. [0003] In order to reuse the waste, the traditional treatment method for the scraps of solar silicon cell coatings is to wash them with a mixed solution 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 re-melting. [0004] 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B08B3/08B08B3/12
Inventor 霍立孙志刚贾金有
Owner KAIFENG WANSHENGXIN MATERIALS
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