Purification of metallurgical grade silicon by plasma torch and E-beam treatment

Jung Hyun Eum, Sahn Nahm, Kwang Taek Hwang, Kyung Ja Kim, Kyoon Choi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Cost-effective purification methods of silicon were carried out in order to replace the conventional Siemens method for solar grade silicon. Firstly, acid leaching which is a hydrometallurgical process was preceded with grinded silicon powders of metallurgical grade (∼99% purity) to remove metallic impurities. Then, plasma treatments were performed with the leached silicon powders of 99.94% purity by argon plasma at 30 kW power under atmospheric pressure. Plasma treatment was specifically efficient for removing Zr, Y, and P but not for Al and B. Another purification step by EB treatment was also studied for the 99.92% silicon lump which resulted in the fast removal of boron and aluminum. That means the two methods are effective alternative tools for removing the doping elements like boron and phosphor.

Original languageEnglish
Pages (from-to)618-622
Number of pages5
JournalJournal of the Korean Ceramic Society
Volume47
Issue number6
DOIs
Publication statusPublished - 2010

Keywords

  • Electron-beam treatment
  • Metallurgical grade silicon
  • Plasma treatment
  • Purification
  • Solar grade silicon

ASJC Scopus subject areas

  • Ceramics and Composites

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