Effect of Na2O-SiO2 Slag Treatment on Hydrometallurgical Purification of Metallurgical Grade Silicon

M. Fang; C.H. Lu; H.X. Lai; L.Q. Huang; J. Chen; J.T. Li; W.H. Ma; J.N. Shen; Z.L. Sheng; X.T. Luo

doi:10.4028/www.scientific.net/AMM.420.139

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 420Effect of Na2O-SiO2 Slag Treatment on...

Effect of Na₂O-SiO₂ Slag Treatment on Hydrometallurgical Purification of Metallurgical Grade Silicon

Abstract:

The effects of Na₂O-SiO₂ slag treatment on purification of metallurgical grade silicon by leaching with hydrogen fluoride have been investigated. A comparative analysis of microstructure evolution was carried out to examine the leaching behavior of impurities from metallurgical grade silicon. It was found that the distribution of metal impurities Al, Ca, Ti and Na, which co-deposited with Si and formed different intermetallic phases at grain boundaries, had manifest distinction between precipitated phase and silicon. Moreover, acid corrosion experiment results revealed that slag treatment improved the dissolution rate of metal impurities from metallurgical grade silicon as contrasted to that without slag treatment.

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Periodical:

Applied Mechanics and Materials (Volume 420)

Pages:

139-143

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.420.139

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Online since:

September 2013

Authors:

M. Fang, C.H. Lu, H.X. Lai, L.Q. Huang, J. Chen, J.T. Li, W.H. Ma, J.N. Shen, Z.L. Sheng, X.T. Luo

Keywords:

Acid Leaching, Metallurgical Grade Silicon, Na₂O, Slag Treatment, Solar Grade Silicon

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