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.

Diffusion and mass transfer of boron in molten silicon during slag refining process of metallurgical grade silicon

2015 ◽  
Vol 404 ◽  
pp. 70-74 ◽  
Author(s):  
Jijun Wu ◽  
Fanmao Wang ◽  
Zhengjie Chen ◽  
Wenhui Ma ◽  
Yanlong Li ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Refining Process ◽  
Molten Silicon ◽  
Metallurgical Grade Silicon ◽  
Slag Refining ◽  
Grade Silicon

Boron removal from metallurgical grade silicon using a CaO–Li2O–SiO2 molten slag refining technique

2012 ◽  
Vol 358 (23) ◽  
pp. 3079-3083 ◽  
Author(s):  
Jijun Wu ◽  
Wenhui Ma ◽  
Binjie Jia ◽  
Bin Yang ◽  
Dachun Liu ◽  
...  
Keyword(s):  
Molten Slag ◽  
Boron Removal ◽  
Metallurgical Grade Silicon ◽  
Slag Refining ◽  
Grade Silicon

scholarly journals Boron removal from metallurgical grade silicon using a FeCl2 molten salt refining technique

2013 ◽  
Vol 49 (3) ◽  
pp. 257-261 ◽  
Author(s):  
B.J. Jia ◽  
J.J. Wu ◽  
W.H. Ma ◽  
B. Yang ◽  
D.C. Liu ◽  
...  
Keyword(s):  
Molten Salt ◽  
Boron Concentration ◽  
Metallurgical Process ◽  
Mass Ratio ◽  
Solar Grade Silicon ◽  
Boron Removal ◽  
Metallurgical Grade Silicon ◽  
Slag Refining ◽  
Grade Silicon ◽  
Refining Time

The slag refining for boron removal from metallurgical grade silicon is a promising metallurgical process for producing solar grade silicon. In this paper, FeCl2 molten salt has been used as a new refining agent to remove boron from MG-Si. The effects of refining time and mass ratio of MG-Si to FeCl2 molten salt on boron removal have been investigated in detail. The results showed that boron can be efficiently removed in form of BCl3 and boron concentration in MG-Si was successfully reduced from 22?10-6 to 4?10-6 at 1823K for 2 h with the mass ratio of FeCl2 molten salt to MG-Si for 1.0. The rate equation of boron removal using FeCl2 molten salt was proposed and established in kinetic, which showed a large difference in removal limitation of boron compared with thermodynamics.

Boron removal in purifying metallurgical grade silicon by CaO–SiO2 slag refining

2014 ◽  
Vol 24 (4) ◽  
pp. 1231-1236 ◽  
Author(s):  
Ji-jun WU ◽  
Yan-long LI ◽  
Wen-hui MA ◽  
Kui-xian WEI ◽  
Bin YANG ◽  
...  
Keyword(s):  
Boron Removal ◽  
Metallurgical Grade Silicon ◽  
Slag Refining ◽  
Grade Silicon

Boron removal for solar-grade silicon production by metallurgical route:A review

2019 ◽  
Vol 203 ◽  
pp. 110169 ◽  
Author(s):  
Hui Chen ◽  
Kazuki Morita ◽  
Xiaodong Ma ◽  
Zhiyuan Chen ◽  
Ye Wang
Keyword(s):  
Solar Grade Silicon ◽  
Boron Removal ◽  
Silicon Production ◽  
Grade Silicon

Study on Theoretical Basis and Process Optimization for Solar Grade Silicon Fabrication

2010 ◽  
Vol 663-665 ◽  
pp. 1069-1072
Author(s):  
Yong Chao Gao ◽  
Bai Tong Zhao
Keyword(s):  
Solar Cells ◽  
Acid Leaching ◽  
Raw Material ◽  
Photoelectric Conversion Efficiency ◽  
Molten Silicon ◽  
Solar Grade Silicon ◽  
Photoelectric Conversion ◽  
Cell Carrier ◽  
Grade Silicon ◽  
Reactive Gases

As solar energy is inexhaustible, solar cells have become one of the options to the future energy. The raw material silicon as one of the Earth's most abundant resources elements, have the advantage of non-toxic, no pollution, no radiation, high photoelectric conversion efficiency, stability and reliability of optical performance become the main raw material for production of solar cells. Because of its supply is limited, We used relatively inexpensive metallurgical grade silicon as a starting material to produce solar grade silicon for solar cells is considered relatively inexpensive method. Therefore, the removal of impurities from metal silicon witch reduce solar cell carrier lifetime and thus reducing its power generation efficiency is a significant issue. To this end, according to impurities in molten silicon and solid silicon demonstrated various characteristics and existence forms, in this paper we used acid leaching, directional solidification, electron and magnetic field, vacuum melting, blow reactive gases and so on to fabricate solar grade silicon from metal silicon in theory to analyze and optimize process.

Boron removal from metallurgical-grade silicon by CaO–SiO2 slag refining

Rare Metals ◽  
2015 ◽  
Vol 34 (7) ◽  
pp. 522-526 ◽  
Author(s):  
Kui-Xian Wei ◽  
Hai-Fei Lu ◽  
Wen-Hui Ma ◽  
Yan-Long Li ◽  
Zhao Ding ◽  
...  
Keyword(s):  
Boron Removal ◽  
Metallurgical Grade Silicon ◽  
Slag Refining ◽  
Grade Silicon

scholarly journals Measurement of CaO-SiO2-SaCl2 slag density by an improved Archimedean method

2015 ◽  
Vol 51 (2) ◽  
pp. 113-116 ◽  
Author(s):  
Y. Wang ◽  
K. Morita
Keyword(s):  
Molar Volume ◽  
Molten Slag ◽  
Solar Grade Silicon ◽  
Linear Fitting ◽  
Temperature Range ◽  
Grade Silicon ◽  
Increasing Temperature

In order to optimize the removal of boron during the refining of slag to obtain solar grade silicon, the density of molten slag was measured by an improved Archimedean method within a temperature range from 1073 to 1373 K. It was found that the density of molten slag at 1723 K can be deduced by linear fitting, and that the slag density decreases with increasing temperature. However, a reduction in slag density occurs with decreasing CaO concentration. An increase in the molar volume of slag was also observed with increasing temperature.

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