High-Temperature Refining of Metallurgical-Grade Silicon: A Review

Johnston, M.D.; Khajavi, Leili Tafaghodi; Li, Mark; Sokhanvaran, Samira; Barati, Mansoor

doi:10.1007/s11837-012-0384-3

Cited by 97 publications

(36 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many previous studies on refining Si using plasma treatment or gas blowing showed similar trends, and the authors explained that this phenomenon is related to a half-order relation of steam to the elimination rate of B [24,31]. Generally, the required purity of Si for solar application is approximately 6N-7N with a B content of under 1.0 ppmw [32]. Our results did not meet the requirements, since we added excessive amount of B to our starting Si material.…”

Section: Experimental Studysupporting

confidence: 45%

Novel Recycling Method for Boron Removal from Silicon by Thermal Plasma Treatment Coupled with Steam and Hydrogen Gases

Baek

Lee

Min

et al. 2017

Metals

View full text Add to dashboard Cite

Boron (B) separation from photovoltaic silicon (Si) remains a research challenge in the recycling field. In this study, a novel B-removal process was developed using thermal plasma treatment coupled with steam and hydrogen gases. Experiments were performed on artificially B-doped Si using various plasma conditions of mixed argon (Ar)/steam/hydrogen gases and varied refining time. The B concentration in all of the samples decreased with increasing refining time. The use of the plasma mixed with Ar/steam/hydrogen gases resulted in a significant improvement of the efficiency of B removal compared with the Ar/steam plasma refining. In addition, with increasing steam content in the plasma with mixed Ar/steam/hydrogen gases, the B-removal rates increased.

show abstract

Section: Experimental Studysupporting

confidence: 45%

Novel Recycling Method for Boron Removal from Silicon by Thermal Plasma Treatment Coupled with Steam and Hydrogen Gases

Baek

Lee

Min

et al. 2017

Metals

View full text Add to dashboard Cite

show abstract

“…The electronegativity of Ti is lower than Si. 27) Thus in the electrochemical production of Ti from Ti 5 Si 3 , Si will not anodically dissolve in the electrolyte, and the two elements will be separated. However, limited research has been done in the field of electrolytic separation pure elements from intermetallic compounds.…”

Section: Practical Reactionsmentioning

confidence: 99%

Reduction of Titanium Oxide by Molten Silicon to Synthesize Titanium Silicide

Chen

Tan

et al. 2015

Mater. Trans.

View full text Add to dashboard Cite

Titanium silicide was synthesized via the reaction of titanium oxide bearing slag and molten silicon. Results indicated that titanium oxide in slag was reduced by silicon with an intermetallic bulk being formed. This novel synthesis method is a three-layer refining process that is much simpler and could reduce the cost of titanium silicide production significantly. Moreover, this novel and low-cost synthesis method of Ti 5 Si 3 provides a new way to produce high purity titanium.

show abstract

“…The primary intermetallic compounds at room temperature include η″ (Cu 3 Si), ε (Cu 15 Si 4 ), and γ (Cu 5 Si), and the eutectic temperature is 802 1C with a composition of 69.9 at.% Cu. Cu has been employed in the solvent refining to purify the metallurgicalgrade silicon, acting as an impurity trapper during the solidification (Johnston et al, 2012). This solvent refining method combined with the acid leaching can effectively reduce the impurity level.…”

Section: Introductionmentioning

confidence: 99%