Cristin-resultat-ID: 922690
Sist endret: 8. mai 2012, 15:28
NVI-rapporteringsår: 2012
Resultat
Vitenskapelig artikkel
2012

Electrorefining of Metallurgical Grade Silicon in Molten CaCl2 Based Salts

Bidragsytere:
  • J. Cai
  • Xue-tao Luo
  • Geir Martin Haarberg
  • Ole Edvard Kongstein og
  • Shulan Wang

Tidsskrift

Journal of the Electrochemical Society
ISSN 0013-4651
e-ISSN 1945-7111
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2012
Volum: 159
Hefte: 3
Sider: D155 - D158

Importkilder

Isi-ID: 000299292100049

Beskrivelse Beskrivelse

Tittel

Electrorefining of Metallurgical Grade Silicon in Molten CaCl2 Based Salts

Sammendrag

Electrorefining of metallurgical grade silicon was studied in molten CaCl2-NaCl-CaO-SiO2 (80:10:5:5 mol%) at temperatures from 1123 to 1223 K. A liquid anode prepared by alloying the metallurgical grade silicon with copper (31 mol% Si and 69 mol% Cu) was used to prevent the anode passivation problems and improve the purity of the produced silicon. Electrochemical studies of silicon deposition were performed, and the diffusion coefficient of Si (IV) was calculated. Analysis results indicated that the contents of boron and phosphorus in the refined silicon obtained by potentiostatic electrolysis were reduced from 36 ppmw and 25 ppmw to 0.27 ppmw and 0.89 ppmw respectively. The corresponding current efficiency and energy consumption were estimated to be 72% and about 2 kWh (kg of Si)−1. These promising results show that the present electrorefining process is an alternative way to produce high purity silicon for solar cell applications.

Bidragsytere

J. Cai

  • Tilknyttet:
    Forfatter
    ved Xiamen University

Xue-tao Luo

  • Tilknyttet:
    Forfatter
    ved Xiamen University

Geir Martin Haarberg

  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet

Ole Edvard Kongstein

  • Tilknyttet:
    Forfatter
    ved Bærekraftig energiteknologi ved SINTEF AS

Shulan Wang

  • Tilknyttet:
    Forfatter
    ved Northeastern University Shenyang
1 - 5 av 5