Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2018-01-01

Journal: SEPARATION SCIENCE AND TECHNOLOGY

Included Journals: SCIE

Volume: 53

Issue: 13

Page Number: 2144-2149

ISSN: 0149-6395

Key Words: B removal; metallurgical-grade silicon; slag refining; thermodynamic analysis; kinetic analysis

Abstract: Boron (B) removal by slag refining using Na2O-SiO2 was investigated in industrial applications. The experimental results showed that the reasonable ratio range of slag to silicon is about 0.7-0.8; the suitable holding time is about 30min; the concentration of B is reduced from 1.90 ppmw to 0.17 ppmw by three times slag refining; and the removal efficiency of B reaches 91.1%. Moreover, it is discussed that B in silicon is more inclined to be oxidized by Na2O than SiO2 according to thermodynamic analysis and then volatilized to the atmosphere in the form of Na2B2O4 according to kinetic analysis.