Refining of Silicon Using an Induction Furnace in the Fractional Melting Process

Juho Chung, Changbum Lee, Jaewoo Lee, Wooyoung Yoon

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A new fractional melting process using an induction furnace and a centrifugal system has been developed for metallurgical-grade silicon (MG-Si) refining. An induction furnace enables rapid heating and therefore reduces the total refining process time. Impurity-rich liquids can be ejected effectively from the MG-Si by the centrifugal force induced by a motor. The impurity behaviors of the refined samples are observed by scanning electron microscope (SEM). The refining efficiency, which depends on sample size and centrifugal force, is evaluated using inductively coupled plasma atomic emission spectroscopy (ICP-AES) and inductively coupled plasma mass spectroscopy (ICP-MS). The purity of the refined silicon increases with the centrifugal force. The correlation between the centrifugal force and silicon purity is rationalized using the surface tension of impurity-rich liquids. In spite of the rapid heating rate by induction furnace, the MG-Si is refined and 96.7% of the impurities are removed at rotation speeds of 3000 rpm.

Original languageEnglish
Pages (from-to)2345-2351
Number of pages7
JournalSeparation Science and Technology (Philadelphia)
Volume48
Issue number15
DOIs
Publication statusPublished - 2013 Oct

Keywords

  • centrifugal force
  • fractional melting
  • induction furnace
  • liquid separation
  • silicon refining

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Process Chemistry and Technology
  • Filtration and Separation

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