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메커니컬 실 제조공정에서 폐패널 실리콘 재활용의 전과정 평가
신병철 ( Byung-chul Shin ),장근용 ( Geun-yong Jang ),최준철 ( Joon-chul Choi ) 한국폐기물자원순환학회 2023 한국폐기물자원순환학회지 Vol.40 No.1
In this study, an environmental evaluation of a mechanical seal manufacturing process involving recycled silicon from end-of-life PV panels was conducted using the life cycle assessment (LCA) approach. The β-phase silicon carbide (β-SiC), which was synthesized from recycled silicon and carbon through a direct carbonization method, exhibited a high crystallite size range of 18 ~ 21 μm and purity of 99.9%, suggesting its suitability as a raw material for the manufacture of mechanical seals. The wet method of fine grinding and mixing of raw materials was improved to a dry method without using a solvent. Global warming emissions and photochemical oxidants were decreased from 40 to 27.6 kg-CO<sub>2</sub>/kg-SiC and 2.23 to 0.124 kg-C<sub>2</sub>H<sub>4</sub>/kg-SiC, corresponding to decreasing rates of 31.1 and 94.5%, respectively, following the mixing of ground SiC with carbon (C) and the improvement of β-SiC granulation using a dry method. Whereas recycling Si of end-of-life PV panels reduced the resource depletion- and global warming-associated environmental impacts by 61.9 and 64.1%, respectively. On the other hand, weight analysis showed a reduction of the overall environmental impacts by 54.3%, while those related to resource depletion, global warming, and photochemical oxidant formation were reduced by 40.8, 35.7, and 19.4%, respectively, even though only the global warming potential (GWP) exhibited very high values in the characterization results. The obtained results demonstrated the contributions of electricity consumption during the β-SiC synthesis process and high-temperature calcination to global warming. Moreover, SiC chunk results in resource depletion and global warming, while hydrogen peroxide generates photochemical oxidants. The LCA analysis was useful in this study for quantitatively assessing the effects of the improved environmental impacts. Recycling SiC from end-of-life PV panels could be a valuable approach to ensuring sustainable development due to the low carbonization and clean manufacturing process.
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태양광 폐패널 회수 실리콘을 활용한 탄화규소 분말 합성
권우택(Wooteck Kwon),권오규(Oh-Kyu Kwon),최준철(Joon-Chul Choi),장근용(Geun-Yong Jang) 한국환경에너지공학회 2022 한국열환경공학회 학술대회지 Vol.2022 No.2
Silicon carbide powder was prepared using carbon black and silicon recovered from the solar waste panel. In the solar power generation market, crystalline silicon modules are more than 90%. As the expiration date of the photovoltaic module arrives, technology for recovering and utilizing silicon from an environmental and economic point of view is very important. In this study, in order to use silicon recovered from a solar waste panel as a silicon carbide raw material, 99.99% silicon powder was recovered through a purification process from a 95.74% purity waste silicon wafer. To examine the synthesis characteristics of silicon carbide powder, the purified 99.99% silicon powder and carbon powder were mixed, and then heat treatment (l,300° C, 1,400° C, 1,500° C) was performed in an Ar atmosphere. The characteristics of silicon and silicon carbide powder were analyzed using particle size distribution. XRD, SEM, ICP, FT-IR, and Raman analyzer.
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