Recycling of Cutting Oil from Silicon Waste Sludge of Solar Wafer 


Vol. 22,  No. 4, pp. 274-280, Dec.  2016
10.7464/ksct.2016.22.4.274


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  Abstract

In this study, it was to develop a chemical method that can recycle the cutting oil which accounts for about 25% of the cost of the process among containing materials of silicon waste sludge generated in the process for producing a solar cell wafer. The 7 types of reagents have been used, including acetone, HCl, NaOH, KOH, Na2CO3, HF, CH2Cl2, etc. for this experiment. And It was carried out at a speed of 3000 rpm for 60 minutes centrifugation after performing a reaction with a waste sludge at various concentrations. As a result, the best reagents and conditions for separating the solid such as a silicon powder and a metal powder and liquid cutting oil were identified as 0.3 N NaOH. It is found to be pH 6.05 in a post-processing recycled cutting oil with 0.3 N NaOH after reaction of waste sludge and 0.1 N HCl which is effective to remove metal powder in order to adjust the pH to suit the properties of the weak acid is a commercially available cutting oil and it showed excellent turbidity than when applied to sludge with 0.3 N NaOH alone. The results of FT-IR analysis which can compare the properties of the commercially available cutting oil shows it has a possibility of recycling oil. The cutting oil recovery rate obtained through the experiment was found to be 86.9%.

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  Cite this article

[IEEE Style]

U. MH, L. JJ, H. BY, "Recycling of Cutting Oil from Silicon Waste Sludge of Solar Wafer," Clean Technology, vol. 22, no. 4, pp. 274-280, 2016. DOI: 10.7464/ksct.2016.22.4.274.

[ACM Style]

Um MH, Lee JJ, and Ha BY. 2016. Recycling of Cutting Oil from Silicon Waste Sludge of Solar Wafer. Clean Technology, 22, 4, (2016), 274-280. DOI: 10.7464/ksct.2016.22.4.274.

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