Processing method of coating film crushed materials of solar silicon cell
A processing method and technology of silicon cells, which are applied in the field of solar silicon industry, can solve the problems of residual compounds, shortage of raw materials, failure to meet the standard of re-melting, etc., and achieve the effects of easy use, increased availability, and realization of reuse
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[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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