|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Materials for Green Energy
||Electromagnetic Levitation Refining Of Silicon-iron Alloys for Generation of Solar Grade Silicon
||Yindong Yang, Katherine Le, Mansoor Barati, Alex McLean
|On-Site Speaker (Planned)
At present, expensive semiconductor grade silicon (SEG-Si) is used for the manufacture of cells to convert solar energy into electricity. This results in a high cost for photovoltaic electricity compared to electricity derived from conventional sources. The processing of inexpensive metallurgical silicon, or ferrosilicon alloys to solar grade silicon, is a potentially economical refining route to produce photovoltaic (PV) silicon. With phosphorus being one of the most difficult impurities to remove by conventional techniques, this project investigated the use of electromagnetic levitation (EML) of ferrosilicon (75Fe-25Si) in a hydrogen-argon gas stream (48.5% H2), to assist with dephosphorization. The experimental results demonstrated that dephosphorization was achieved through increased processing time in the EML system, with approximately 40% of phosphorus removed from ferrosilicon after 20 minutes. Effects of changing system pressure, thermodynamic and kinetic factors on dephosphorization were also evaluated.
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