| Budget Amount *help |
¥45,630,000 (Direct Cost: ¥35,100,000、Indirect Cost: ¥10,530,000)
Fiscal Year 2018: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
Fiscal Year 2017: ¥15,210,000 (Direct Cost: ¥11,700,000、Indirect Cost: ¥3,510,000)
Fiscal Year 2016: ¥23,010,000 (Direct Cost: ¥17,700,000、Indirect Cost: ¥5,310,000)
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| Outline of Final Research Achievements |
Innovative silicon purification process for solar grade silicon production to remove B and P most effectively by solvent refining process combined with flux treatment was optimized. Effective B removal condition for low temperature solidification refining with slag treatment was evaluated by measuring the activity coefficient (thermodynamic stability of B) for various alloy composition followed by the slag refining examination.
In addition, possibility of the flux dephosphorization by the reduction reaction (instead of normal oxidation reaction) was confirmed by changing silicon alloy composition and flux system. Furthermore, highly effective dephosphorization was attained by solidification refining after the slag treatment.
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