scholarly journals Separation and Recovery of Refined Si from Al–Si Melt by Modified Czochralski Method

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 996
Author(s):  
Jingwei Li ◽  
Juncheng Li ◽  
Yinhe Lin ◽  
Jian Shi ◽  
Boyuan Ban ◽  
...  
Keyword(s):  
Industrial Application ◽  
Alloy System ◽  
Silicon Powder ◽  
Czochralski Method ◽  
Refining Process ◽  
Solar Grade Silicon ◽  
Solvent Refining ◽  
Grade Silicon ◽  
Czochralski Process ◽  
Removal Fraction

Separation of refined silicon from Al–Si melt is still a puzzle for the solvent refining process, resulting in considerable waste of acid and silicon powder. A novel modified Czochralski method within the Al–Si alloy is proposed. After the modified Czochralski process, a large amount of refined Si particles was enriched around the seed crystalline Si and separated from the Al–Si melt. As for the Al–28%Si with the pulling rate of 0.001 mm/min, the recovery of refined Si in the pulled-up alloy (PUA) sample is 21.5%, an improvement of 22% compared with the theoretical value, which is much larger 1.99 times than that in the remained alloy (RA) sample. The content of impurities in the PUA is much less than that in the RA sample, which indicates that the modified Czochralski method is effective to improve the removal fraction of impurities. The apparent segregation coefficients of boron (B) and phosphorus (P) in the PUA and RA samples were evaluated. These results demonstrate that the modified Czochralski method for the alloy system is an effective way to enrich and separate refined silicon from the Al–Si melt, which provide a potential and clean production of solar grade silicon (SoG-Si) for the future industrial application.

Super Gravity Separation of Purified Si from Solvent Refining with the Al-Si Alloy System for Solar Grade Silicon

Silicon ◽  
2014 ◽  
Vol 7 (3) ◽  
pp. 239-246 ◽  
Author(s):  
Jing-wei Li ◽  
Zhan-cheng Guo ◽  
Jun-cheng Li ◽  
Li-zhi Yu
Keyword(s):  
Alloy System ◽  
Gravity Separation ◽  
Solar Grade Silicon ◽  
Solvent Refining ◽  
Grade Silicon

Electrolysis Process for Preparation of Solar Grade Silicon

2011 ◽  
Vol 391-392 ◽  
pp. 697-702 ◽  
Author(s):  
Xiang Yu Zou ◽  
Hong Wei Xie ◽  
Yu Chun Zhai ◽  
Xiao Chuan Lang ◽  
Jun Zhang
Keyword(s):  
Electrochemical Method ◽  
Silicon Powder ◽  
Argon Atmosphere ◽  
Impurity Level ◽  
Solar Grade Silicon ◽  
Metallurgical Grade Silicon ◽  
Pure Silicon ◽  
Cell Components ◽  
Nickel Crucible ◽  
Grade Silicon

Studied on electrorefining metallurgical grade silicon to prepare solar grade silicon(SOG-Si) with electrochemical method in molten KCl and NaF mixture salt. Molten KCl and NaF mixture salt as electrolyte, the metallurgical grade silicon as anode and little metal nickel crucible for collecting silicon powder as cathode, electrorefining experiments were performed at 800 and 2.0V for 14h under dry argon atmosphere. The results showed that the metallurgical grade silicon could be dissolved and deposited on the cathode through molten potassium chloride (KCl) and sodium fluoride (NaF) mixture salt electrolyte. The nickel crucible was full of deposit, which was pure silicon by XRD and EDS. Purity of refined silicon was close to 99.99%, most of impurities like B and P were reduced significantly. Impurity level of silicon was reduced to the desired range for SOG-Si by advancement of the materials for the cell components.

Low-cost solar grade silicon powder through iterative gettering of thermally treated porous silicon

2016 ◽  
Vol 83 ◽  
pp. 324-328 ◽  
Author(s):  
Marouan Khalifa ◽  
Malek Atyaoui ◽  
Rachid Ouertani ◽  
Messaoud Hajji ◽  
Hatem Ezzaouia
Keyword(s):  
Porous Silicon ◽  
Low Cost ◽  
Silicon Powder ◽  
Solar Grade Silicon ◽  
Grade Silicon ◽  
Thermally Treated

The Rate of Boron Removal from Molten Silicon by CaO-SiO2 Slag and Cl2 Treatment

2012 ◽  
Vol 31 (4-5) ◽  
pp. 471-477 ◽  
Author(s):  
Hiroshi Nishimoto ◽  
Youngjo Kang ◽  
Takeshi Yoshikawa ◽  
Kazuki Morita
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Molten Slag ◽  
Refining Process ◽  
Molten Silicon ◽  
Solar Grade Silicon ◽  
Boron Removal ◽  
Present Experimental Condition ◽  
Slag Refining ◽  
Grade Silicon

AbstractIn order to optimize a boron removal process by slag refining to obtain solar grade silicon, the rate of boron removal from molten silicon using CaO-SiO2 slag was investigated at 1823 K in an Ar atmosphere. The rate of boron removal was found to be controlled by mass transfer in molten slags, and the mass-transfer coefficient of boron in molten slag in the present experimental condition was evaluated. Some experiments on chlorination of boron in silicon and that of borate in slag using Cl2 gas were also carried out. Experimental results showed that the slag refining process with chlorination was proposed as a promising method for the boron removal from molten silicon.

Plasma-refining process to provide solar-grade silicon

2002 ◽  
Vol 72 (1-4) ◽  
pp. 69-75 ◽  
Author(s):  
Y Delannoy ◽  
C Alemany ◽  
K.-I Li ◽  
P Proulx ◽  
C Trassy
Keyword(s):  
Refining Process ◽  
Solar Grade Silicon ◽  
Grade Silicon

An Evolving Method for Solar-Grade Silicon Production: Solvent Refining

JOM ◽  
2012 ◽  
Vol 64 (8) ◽  
pp. 946-951 ◽  
Author(s):  
Takeshi Yoshikawa ◽  
Kazuki Morita
Keyword(s):  
Solar Grade Silicon ◽  
Solvent Refining ◽  
Silicon Production ◽  
Grade Silicon

Study of the electrical properties of  Cz p-type solar-grade silicon wafers against the high-temperature processes

2021 ◽  
Vol 127 (6) ◽  
Author(s):  
Mohamed Maoudj ◽  
Djoudi Bouhafs ◽  
Nacer Eddine Bourouba ◽  
Abdelhak Hamida-Ferhat ◽  
Abdelkader El Amrani
Keyword(s):  
High Temperature ◽  
Electrical Properties ◽  
Silicon Wafers ◽  
Solar Grade Silicon ◽  
High Temperature Processes ◽  
Grade Silicon ◽  
P Type
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