成果報告書詳細
管理番号20120000000569
タイトル*平成23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 太陽電池用ポリシリコンのシリコン原料転換の研究開発
公開日2012/12/26
報告書年度2011-2011
委託先名新日本ソーラーシリコン株式会社
プロジェクト番号P07015
部署名新エネルギー部
和文要約和文要約等以下本編抜粋:本研究は、ポリシリコンの原料として全量輸入に頼っている粗金属シリコン(Si)に代わって、より安価に調達できるシリカ(SiO2 )を原料とする太陽電池用ポリシリコンの生産技術を開発することである。
英文要約Title: Development of Next-generation High-performance Technology for Photovoltaic Power Generation System. Study on Conversion of Raw Materials for Producing Solar-Grade Polysilicon. (FY2010-FY2012) FY2011 Annual Report
The objective of this study is to reduce costs for producing solar-grade polysilicon to achieve the goals along the national policy on photovoltaic power generation by 2030. A new method for producing silicon tetrachloride (SiCl4), which is an intermediate for producing solar grade polysilicon by the zinc reduction process, has been investigated to substitute silica for costly metallurgical grade silicon as its raw materials. The new method can expectedly lead to significant cut-down of production costs for producing SiCl4. In the method, SiCl4 is produced by reacting silica and chlorine with carbon. The reaction gives the following equation: SiO2 + 2Cl2 + 2C → SiCl4 + 2CO (endothermic reaction at elevated temperatures) In this study, the following two targets are set to be accomplished in 2011. 1. Productivity for producing SiCl4 for commercialization: 0.7 metric tons-SiCl4/m2*/hr. * Inner area of a chlorinator represents the area of the unit. 2. Quality of produced SiCl4 after distillation: 6 nines (99.9999 wt%). During 2011, the following experiments have been carried out as planned: 1. Raw materials: About 1 mm particles as a mixture of powdery silica sand and cokes. 2. Chlorinator: 70mm in inner-diameter, made of graphite. 3. Reaction manner: Fluidized bed. 4. Reaction temperature: Above 1300 degree C. 5. Reaction time: Approximately 30 minutes. As a result, the experiments recorded 0.79 metric tons-SiCl4/m2/hr, which is beyond the first target. Moreover, in order to investigate the better productivity, a heating on the particles at 1500 degree C was done prior to the chlorination. The heating was positively effective on the particle strength, and produced some silicon carbide (SiC) caused by reactions between silica and cokes. The effects gave the higher productivity through the same manner of chlorination. The best productivity was 0.91 metric tons-SiCl4/m2/hr. In addition, the produced SiC helped the reaction temperatures in the chlorinator more stable by its exothermic reaction with chlorine. Lastly, an analysis (GC-MS) of the produced SiCl4 after a fine distillation showed 6 nines or purer. The second target for the quality of SiCl4 has been also achieved.
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