Purification of metallurgical grade silicon by a microwave-assisted plasma process

Wang, Jiangtao; Li, Xiaodong; He, Yongmin; Feng, Na; An, Xiuyun; Teng, Feng; Gao, Caitian; Zhao, Changhui; Zhang, Zhenxing; Xie, Erqing

doi:10.1016/j.seppur.2012.09.035

Cited by 26 publications

(5 citation statements)

References 20 publications

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“…In order to reduce its energy consumption and environment pollution, metallurgical refining processes of SoG-Si using metallurgical grade Si (MG-Si) as a starting material have been developed. These include slag treatment [4], plasma treatment [5], and solvent refining [6].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of B removal by solvent refining of silicon in Al–Si melt with Ti addition

Ban

Bai

et al. 2016

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Mechanism of B removal by solvent refining of silicon in Al–Si melt with Ti addition

Ban

Bai

et al. 2016

Journal of Alloys and Compounds

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“…As an alternative, the metallurgical re ning processes, which employ metallurgical grade Si (MG-Si) as the starting materials, have been developed. There include, but no mean complete, slag treatment [3], plasma treatment [4], acid leaching [5], directional solidi cation [6], solvent re ning [7], and so on. Among these, solvent re ning is a promising technique for the SoG-Si feedstock production.…”

Section: Introductionmentioning

confidence: 99%

Effect of Si Content on the Morphology Evolution of the Si Primary Dendrites in Al-Si Alloy Solvent Refining Process

Gao

Zhao

Gao

et al. 2021

Silicon

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Solvent re ning with Al-Si alloy is a promising puri cation method for production of solar-grade silicon (SoG-Si) feedstock owing to the advantages of low production cost and high impurity removal e ciency. In this process, larger re ned Si primary dendrites are easily collected after acid leaching, which is favorable to recovery, thereby to reduce the production cost. Hence, the growth behavior of the precipitated Si crystal must be investigated systematically. In present work, the morphology evolution of solidi ed Al-Si alloys with a wide range of Si content (30~70 wt.%) was analyzed. The typical plate-like Si primary dendrites grown following the twin plane re-entrance edge (TPRE) mechanism formed in all alloy compositions. As increasing the Si content from 30 wt.% to 50 wt.%, the Si primary dendrites underwent a coarsening process attributed to the preferred growth along <211> and <111> directions, leading to an increase in the experimental recovery rate. However, the preferred growth along <211> direction was inhibited when the Si content is higher than 55 wt.%. Moreover, the broken effect originating from grain collision and thermal stress on the Si primary dendrites was enhanced as further increasing the Si content, resulting in a decrease in the experimental recovery rate. Therefore, the optimum composition is determined as Al-50~55 wt.% Si for solvent re ning solution, based on the cost reduction consideration.the manuscript was written by Mangmang Gao and all authors commended on previous versions of the manuscript. All authors read and approved the nal manuscript.

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“…Therefore, during the past decade, researchers all over the world have been devoting to upgrade metallurgical grade silicon (MG-Si, purity: about 99%) to SoG-Si via a more economic and environmental friendly metallurgical route [2]. After years of efforts, several metallurgical refining methods were proposed, such as directional solidification [3], vacuum treatment [4], solvent refining [5], slag refining [6,7], plasma refining [8], hydrometallurgical acid leaching [9], etc. Solvent refining is proposed because MG-Si can be purified below its melting temperature with no waste gases or slag discharged.…”

Section: Introductionmentioning

confidence: 99%

Separation and purification of Si from Sn-30Si alloy by electromagnetic semi-continuous directional solidification

Huang

Zhao

Liu

et al. 2019

Materials Science in Semiconductor Processing

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Purification of metallurgical grade silicon by a microwave-assisted plasma process

Cited by 26 publications

References 20 publications

Mechanism of B removal by solvent refining of silicon in Al–Si melt with Ti addition

Mechanism of B removal by solvent refining of silicon in Al–Si melt with Ti addition

Effect of Si Content on the Morphology Evolution of the Si Primary Dendrites in Al-Si Alloy Solvent Refining Process

Separation and purification of Si from Sn-30Si alloy by electromagnetic semi-continuous directional solidification

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