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, Volume 12, Issue 1, pp 171–183 | Cite as

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

  • Guoyu Qian
  • Zhi WangEmail author
  • Xuzhong Gong
  • Jianwei Cao
  • Wenhui Ma
Original Paper
  • 48 Downloads

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.

Keywords

Solar grade silicon Slag refining Phosphorus removal Raman structure NMR structure 

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Notes

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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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Guoyu Qian
    • 1
  • Zhi Wang
    • 1
    Email author
  • Xuzhong Gong
    • 1
  • Jianwei Cao
    • 1
  • Wenhui Ma
    • 2
  1. 1.Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process EngineeringChinese Academy of SciencesBeijingChina
  2. 2.Faculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunmingPeople’s Republic of China

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