成果報告書詳細
管理番号20140000000671
タイトル*平成24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2012 - 2012
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) FY2012 Annual report

(1) Development of separation process of silicon powder and impurities
(1-1) Modeling of dead-end and cross-flow filtration. After consideration about a reduction of dead-end filtration time using the model equation which was proposed by our group last year, it was predicted that it is effective for reduction a filtration time by dilution of a waste coolant due to decrease of viscous resistance. To verify the prediction, the dead-end filtration using actual waste coolant and diluted coolant was carried out. The experimental results showed validation of the model equation. In order to concentrate silicon powders in a waste coolant, a cross-flow filtration is required. In order to explain experimental results of cross-flow filtration, we proposed a model equation. The calculated results using the model equation correspond with the experimental results. (1-2) Separation of SiC and Si particles. In case of loose-abrasive slicing, SiC and Si particles were contained in a waste coolant. In order to separate them, the difference of sedimentation velocities of SiC and Si particles was utilized. We observed a sedimentation states using a microscope as a function of a retention time. With increasing the retention time, the contrast of diluted and concentrated region is increased. (2) Development of reproduction process of feedstock. (2-1) Melting and re-crystallization A shaped Si was set in a Si3N4- coated Si crucible, and was heated at 1550 C for 1 hour in Ar atmosphere. The shaped Si was completely melted during heating.
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