成果報告書詳細
管理番号20140000000693
タイトル*平成25年度中間年報 太陽エネルギー技術研究開発 太陽光発電システム次世代高性能技術の開発 極限シリコン結晶太陽電池の研究開発(スライス時のカーフの回収・再利用)
公開日2015/2/19
報告書年度2013 - 2013
委託先名兵庫県立大学
プロジェクト番号P07015
部署名新エネルギー部
和文要約
英文要約Title: High Performance PV Generation System for the Future. R and D on Ultimate Wafer-based Si Solar Cells. / Recovery of silicon powder from multi-wire-saw sludge and reproduction to feedstock (FY2010-FY2014) FY2013 Annual report

(1) Development of separation process of silicon powder and impurities. In order to increase the separation efficiency between silicon powder and waste coolant, it can be considered that coupling of dead-end filtration and cross-flow filtration is effective. From the result of condensation experiment by cross-flow filtration, it was clarified that condensation limit of silicon concentration in waste coolant was about 25wt% because effective viscosity is increased with increasing silicon concentration. One of the advantage of cross-flow filtration is that amount of throughput can be increased by placing the cross-flow cartridges in parallel. Initial filtration rate is proportional to number of cross-flow cartridges. However, formation speed of cake becomes relatively slow by increasing the number of cartridges. As a result, the filtration time is effectively decreased by increasing the number of cartridge. We simulated the process time to retrieve silicon powder from 100L waste coolant containing 5wt% silicon as functions of number of dead-end filtration units and cross-flow filtration units. When target condensation concentration is constant, number of dead-end filtration units can be reduced by increasing the number of cross-flow filtration unit. By increasing the target condensation concentration, allowable range of filtration units can be widened. (2) Development of reproduction process of feedstock. The surface of retrieved Si powder was oxidized during wire-saw slicing. Since the oxidized layer inhibited melting of silicon, it is necessary to remove the oxidized layer. Although the oxidized layer can be removed by HF solution treatment, the surface of silicon powder was re-oxidized during drying process at 80C. To reduce the re-oxidization, we found that reduced-pressure drying at room temperature is suitable. Coupling with the high-temperature treatment, we succeeded to obtain large size reproduced feedstock.
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