scholarly journals Effects of Slag Treatment Conditions on Boron Removal from Metallurgical Silicon by United Gas-Slag Refining Technology

Silicon ◽  
2021 ◽  
Author(s):  
Qi-liang Wang ◽  
Ji-jun Wu ◽  
Shuang-feng Qian ◽  
Hua-zhen Gu ◽  
Zhen-fei Xia ◽  
...  
Keyword(s):  
Boron Removal ◽  
Slag Refining ◽  
Metallurgical Silicon ◽  
Treatment Conditions ◽  
Slag Treatment

scholarly journals Effects of Slag Treatment Conditions on Boron Removal from Metallurgical Silicon by United Gas-slag Refining Technology

2021 ◽  
Author(s):  
Qi-liang Wang ◽  
Jijun Wu ◽  
Shuang-feng Qian ◽  
Hua-zhen Gu ◽  
Zhen-fei Xia ◽  
...  
Keyword(s):  
Boron Content ◽  
Raw Materials ◽  
Impurity Content ◽  
Silicon Powder ◽  
Boron Removal ◽  
Mixed Gas ◽  
Boron Powder ◽  
Slag Refining ◽  
Metallurgical Silicon ◽  
Removal Of Impurities

Abstract Impurities in industrial silicon strongly affect the performance and use value of silicon products, so that raw industrial silicon must be refined to reduce the impurity content and improve its quality. In this work, the effect of the conditions of the refining process on the removal of impurities was studied. The slag agent and industrial silicon powder are uniformly mixed, and a mixed gas of Ar-H 2 O-O 2 is blown into the melt for refining experiments when the set refining temperature is reached. 3% mass fraction high-purity boron powder is pre-melted into industrial silicon raw materials to prepare Si-3%B alloy raw materials, and then the Si-3%B alloy raw materials are refined and pickled with CaO-SiO 2 -CaCl 2 . The composition of the slag agent, the slag-agent-to-silicon mass ratio, the refining time, and the refining temperature conditions were explored, and the best efficiency of boron removal was found to be 96.77%, with the boron content in silicon decreased from 22 ppmw to the lowest value of 0.6 ppmw. The boron content in refined silicon shows a clear decrease, demonstrating that slag-making gas blowing refining is effective for the removal of impurities in industrial silicon.

Boron Removal from MG-Si by Slag Treatment with Copper Addition

2014 ◽  
Vol 968 ◽  
pp. 31-35
Author(s):  
Rong Yi Chen ◽  
Xiao Bing Yang ◽  
Rui Zhi Chen ◽  
Shi Qiu ◽  
Chuan Hai Gan ◽  
...  
Keyword(s):  
Slag System ◽  
Partition Ratio ◽  
Experimental Results ◽  
Boron Removal ◽  
Removal Ratio ◽  
Slag Refining ◽  
Copper Addition ◽  
Cu Alloy ◽  
Slag Treatment ◽  
Silicon Purification

The effect of slag treatment with Copper addition in silicon purification by metallurgical methods was examined in this paper. The microstructures and contents of Si-Cu alloy after slag refining were investigated by XRD and ICP, respectively. The majority phases in the Si-Cu alloy were Cu3Si and Si. The partition ratio of boron (LB) between slag and silicon was studied with and without Cu addition. Experimental results show that slag treatment with Cu addition can improve the LBin CaO-SiO2-CaF2slag system, where a maximum boron removal ratio of 85% could be achieved.

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 from Metallurgical Silicon using Si-Al-Sn Ternary Alloy

2014 ◽  
Vol 49 (2) ◽  
pp. 305-310 ◽  
Author(s):  
Fumin Xu ◽  
Shenrui Wu ◽  
Yi Tan ◽  
Jiayan Li ◽  
Yaqiong Li ◽  
...  
Keyword(s):  
Ternary Alloy ◽  
Boron Removal ◽  
Metallurgical Silicon

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

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

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.

Sign in / Sign up

Export Citation Format

Share Document