Removal of Boron from Silicon-Tin Solvent by Slag Treatment

Ma, Xiaodong; Yoshikawa, Takeshi; Morita, Kazuki

doi:10.1007/s11663-013-9812-1

Cited by 38 publications

(19 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The B contents reduced from 3.12 ppmw to 0.35 ppmw, and B contents decreased from 3.12 to 1.01 ppmw without the addition of Cu in the experiment under the same conditions. Ma et al [35,36] investigated a sequential refining process of MG-Si composed of Si-Sn solvent refining, slag treatment, and acid leaching. In their work, the prepared Si-Sn alloy was treated with CaO-SiO 2 -CaF 2 slag with different slag to alloy mass ratio.…”

Section: Si-based Alloy Refining Using Slag Systemmentioning

confidence: 99%

Application of slag refining technique to metallurgical grade silicon purification process: A review

Al-khazraji¹

2018

Funct.Mater.

View full text Add to dashboard Cite

The photovoltaic generates electricity through direct conversion of sunlight, has fastgrowing recently due to high global energy demand. Photovoltaic main material is silicon which needs refining process to fulfill the requirements. In this paper, the principle of silicon-slag refining was introduced and several types of imposing slag were reviewed. Boron removal from silicon using Si-based alloy and novel slag with active component were mentioned, and effects of slag refining processing parameters were discussed. According to the investigations, slag refining technique can remove a large amount of boron from MG-Si, and the potential industrial applications of slag refining technique were proposed.Представлен принцип переработки кремниевого шлака, рассмотрены несколько типов шлака. Было упомянуто об удалении бора из кремния с использованием сплава на основе кремния (Si) и нового шлака с активным компонентом, обсуждается эффект от процесса рафинирования шлака. Согласно исследованиям, процесс рафинирования шлака может удалить большое количество бора из MG-Si (металлургического кремния), а также предложена потенциальная промышленная технология рафинирования шлака. Технологія переробки шлаку для металургійного процесу очищення кремнію: огляд. Rowaid Al-khazraji, Yaqiong Li, Lifeng ZhangПредставлено принцип переробки кремнієвого шлаку, розглянуто кілька типів шлакових систем. Розглядається видалення бору з кремнію з використанням сплаву на основі кремнію (Si) та нового шлаку з активним компонентом, обговорюваються наслідки від параметрів рафінування шлаку. За даними досліджень, технологія рафінування шлаку дозволяє видалити велику кількість бору з MG-Si (металургійного кремнію), запропоновано потенційне застосування у промисловості технологій рафінування шлаку.

show abstract

Section: Si-based Alloy Refining Using Slag Systemmentioning

confidence: 99%

Application of slag refining technique to metallurgical grade silicon purification process: A review

Al-khazraji¹

2018

Funct.Mater.

View full text Add to dashboard Cite

show abstract

“…Recently, Hou et al [39] investigated the rare-earth oxides (La 2 O 3 and CeO 2 ) addition into CaO-SiO 2 slag, and increasing B removal from MG-Si was observed. Instead of changing slag composition, it has also been shown that significantly higher L B can be achieved by the slag treatment of alloyed Si such as Si-Sn, [40][41][42] Si-Cu, [43,44] and Si-Fe, [27,45] alloys. Taking into account the research by Ma et al, [40] the CaO-SiO 2 -CaF 2 slag treatment of Si-Sn alloys revealed that the L B value remarkedly increased from 2 to 200 with increasing Sn addition into Si.…”

Section: Introductionmentioning

confidence: 99%

Effects of La2O3 Addition into CaO-SiO2 Slag: Structural Evolution and Impurity Separation from Si-Sn Alloy

Zhu

Azarov

et al. 2021

Metall Mater Trans B

View full text Add to dashboard Cite

Boron (B) and phosphorus (P) are the most problematic impurities to be removed in the production of solar-grade silicon by the metallurgical process. In this work, the distribution of B and P between CaO-(La2O3)-SiO2 slags and Si-10 mass pct Sn melt was experimentally studied. B distribution coefficient increased from 2.93 in binary CaO-SiO2 slag to 3.33 and 3.65 with 2 and 10 mass pct La2O3 additions, respectively. In the followed acid-leaching experiments, the slag-treated Si-Sn alloys exhibited higher B and P removal than that of the initial alloy without slag treatment. Molecular dynamics simulations were performed to study the effect of La2O3 addition on the slag structural and transport properties. A novel oxygen classification method was proposed to distinguish the different structural roles of La and Ca in the CaO-La2O3-SiO2 system. It was found that La3+ prefers to stay in the depolymerized region, mostly connects with 6-7 non-bridging oxygen, and requires a weak charge compensation with Ca2+. Possible silicothermic reduction was evaluated to discuss the slag chemistry and the mass transfer between slag and metal phase. A thermodynamic model was derived to theoretically study the alloying effect on impurity distribution in slag refining where positive interaction coefficient and high alloying concentration were found most beneficial to improve the impurity removal.

show abstract

“…Recently, a Si-Sn alloy was selected as a promising solvent for Si refining with some unique advantages in terms of the removal of B and solidification [29][30][31]. The Si-Sn system has a moderate liquidus slope [32], which indicates a large amount of precipitation with a decrease in temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of solidification conditions on the silicon growth and refining using Si–Sn melt

Lei

Yoshikawa

et al. 2015

Journal of Crystal Growth

Self Cite

View full text Add to dashboard Cite

Effect of solidification conditions on the silicon growth and refining using si-Sn melt, Journal of Crystal Growth, http://dx.doi.org/10.1016/j. jcrysgro. 2015.08.001 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Institute of Industrial Science, The University of Tokyo, Tokyo, Japan. AbstractThe solidification refining of Si using a Si-Sn solvent was investigated under various cooling conditions: (1) slow cooling, (2) slow cooling with electromagnetic stirring, and (3) directional solidification with the aim of developing a novel low-cost route for solar-grade Si production. The separation efficiency of refined Si achieved by combining slow cooling and electromagnetic stirring was much higher than that achieved using directional solidification; in addition, the purification efficiency of the refined Si in both methods was similar. The separation mechanism of refined Si from a Si-Sn melt is also discussed. Purification testing of the refined Si revealed that more than 96% of the metallic impurities, approximately 60% B, and over 70% P were removed.

show abstract

Removal of Boron from Silicon-Tin Solvent by Slag Treatment

Cited by 38 publications

References 13 publications

Application of slag refining technique to metallurgical grade silicon purification process: A review

Application of slag refining technique to metallurgical grade silicon purification process: A review

Effects of La2O3 Addition into CaO-SiO2 Slag: Structural Evolution and Impurity Separation from Si-Sn Alloy

Effect of solidification conditions on the silicon growth and refining using Si–Sn melt

Contact Info

Product

Resources

About