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The mechanism of boron removal from silicon alloy by electric field using slag treatment
Wang, Zhi; Ge, Zhi; Liu, Junhao; Qian, Guoyu; Du, Bing

Stubborn nonmetallic impurity boron is the most difficult to be removed by the metallurgical route for solar grade silicon (SoG-Si) production. To break through the restriction of separation of trace impurity, a novel approach by applying an electrical potential between the slag and the solvent phases to enhance silicon alloy refining using slag was developed. The effect of the external potential and refining time on boron removal has been investigated. For silicon, Al-Si, or Sn-Si system, it can be found that the removal efficiency of B substantially increased with the augment of the external potential. When the external potential was increased to 6 V, the partition ratio of boron increased to 5.7, which was about ten times than that without the external potential applied. Under the constant external potentials, the boron content also decreased with increasing refining time in the Al-Si system, and three stages of average removal velocity of boron were presented within 2 h. In addition, the synergistic removal mechanism of boron with electric field was investigated for the first time. For the electrode reaction, B is oxidated to the oxidizing products, then the oxide crosses the boundary layer rapdily and finally is absorbed by slag owing to the transfer of O2(-) at the anode, at the same time Si is produced at the cathode, which provides theoretical support for this new purification process.

KeywordHigh Purity Silicon Slagging Treatment Boron Removal Electric Field Al-si Alloy
WOS KeywordMetallurgical-grade Silicon ; Blowing Refining Technique ; Molten Silicon ; Solar Grade ; Separation ; Behavior ; Flux
Funding ProjectNational Natural Science Foundation of China[51422405] ; National Natural Science Foundation of China[51704271]
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationNational Natural Science Foundation of China
WOS IDWOS:000430784500015
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Document Type期刊论文
Corresponding AuthorWang, Zhi
AffiliationChinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Wang, Zhi,Ge, Zhi,Liu, Junhao,et al. The mechanism of boron removal from silicon alloy by electric field using slag treatment[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2018,199:134-139.
APA Wang, Zhi,Ge, Zhi,Liu, Junhao,Qian, Guoyu,&Du, Bing.(2018).The mechanism of boron removal from silicon alloy by electric field using slag treatment.SEPARATION AND PURIFICATION TECHNOLOGY,199,134-139.
MLA Wang, Zhi,et al."The mechanism of boron removal from silicon alloy by electric field using slag treatment".SEPARATION AND PURIFICATION TECHNOLOGY 199(2018):134-139.
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