2012 Fiscal Year Final Research Report
The fundamental research of the direct reduction process from silica to solar grade silicon
| Project/Area Number |
23656598
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Energy engineering
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| Research Institution | Hirosaki University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
SATO Hiroyuki 弘前大学, 理工学研究科, 准教授 (10225998)
ITAKA Kenji 弘前大学, 北日本新エネルギー研究所, 准教授 (40422399)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 自然エネルギーの利用 |
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| Research Abstract |
Si manufacturing process for solar cells now composes of the reduction of highly purified trichlorosilane made from the metal Si. Metal Si is obtained by the reduction of Silica stone. high grade SiO_2 which got the target crystal Si manufacturing method from silica sands by this research from The production process we proposed in this research is the direct reduction from high purity silica to solar grade silicon. It is the innovative energy-saving process of manufacturing the solar grade Si.
The purpose of this research is to analyze the flow of the thermodynamic equilibrium of the elementary process of this process, a rate of reaction, and gas in detail by an experiment and calculation, and to acquire knowledge required for the mechanical design of a process and a reduction reactor. The raw silicon oxides are reduced to silicon through various by-products, with carbon. It is indispensable to control this by-product for improvement of the yield of a reduction process.
Because silicon is only generated from by-products, SiO and SiC, reaction control of the by-products is important. According to thermodynamic calculation, by the reaction process of this SiO and SiC, when carbon existed, it turned out that SiC is always generated preferentially. Finally, we obtained silicon by induction-heating method, with precisely controlling carbon consumption, and the production and consumption of SiC.
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[Book] Special Report on Renewable Energy Sources and Climate Change Mitigation, Working Group III of the Intergovernmental Panel on Climate Change2011
Author(s)
Kamimoto Masayuki(共著),O. Edenhofer, R. Pichs-Madruga, Y. Sokona, K. Seyboth, P. Matschoss, S. Kadner, T. Zwickel, P. Eickemeier, G. Hansen, S. Schlomer, C. von Stechow
Total Pages
1075
Publisher
Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA
