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Design of Refining Slag Based on Raman and NMR Spectroscopy Study for Removing Phosphorus for SoG-Si

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Abstract

In present study, Nuclear magnetic resonance (NMR), Raman vibrational spectroscopy were used to investigate in detail the behavior and state of phosphorus (P) in a system SiO2–CaO–Na2O–P2O5 slag. The role of the degree of P–Silicon (Si) cross linking on the P removal from silicon using slag treatment was highlighted by comparing the dephosphorization data. The results show that adding Na2O into acidity slag (CaO/SiO2 = 0.5) from 0 to 30 wt% results in the first increase and then decrease of the removal ratio of P from silicon. When Na2O content is near 15 wt%, the removal ratio of P is above 60%. P2O5 oxidized of P from silicon can be incorporated into the silicate network through P–BO–Si bonds and be stabilized in slag in the form of Q3 (Si and P) species. The removal ratio of P presents a same trend as the relative amount of P–BO–Si bonds and Q3 (Si and P) species, demonstrating fixing P in slag could promote the P removal. Q2 (Si) species of the silicate network as primary intermediate structure could capture P to form Q3 (Si and P) species. When Na2O is less than 15 wt%, Q3 (Si and P) species is promoted to be formed by increasing Na2O, Conversely, it will be depolymerized as Na2O is added to more than 15 wt% to release P by the preferred break of P–BO–Si bonds.

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Acknowledgements

This work was financially supported by National Natural Science Foundation of China (Nos. 51604256 and U1702251) and National Key R&D Program of China (2018YFC1901801).

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Correspondence to Zhi Wang.

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Qian, G., Wang, Z., Gong, X. et al. Design of Refining Slag Based on Raman and NMR Spectroscopy Study for Removing Phosphorus for SoG-Si. Silicon 12, 171–183 (2020) doi:10.1007/s12633-019-00111-x

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Keywords

  • Solar grade silicon
  • Slag refining
  • Phosphorus removal
  • Raman structure
  • NMR structure