Quantitative evaluation for effective removal of phosphorus for SoG-Si

被引：30

作者：

Jung, Eun Jin ^{[1
]}

Moon, Byung Moon ^{[2
]}

Min, Dong Joon ^{[1
]}

机构：

[1] Yonsei Univ, Dept Met Engn, Seoul 120749, South Korea

[2] Korea Inst Ind Technol, Prod Technol R&D Div, Inchon 406840, South Korea

来源：

SOLAR ENERGY MATERIALS AND SOLAR CELLS | 2011年 / 95卷 / 07期

关键词：

Silicon; Phosphide capacity; Slag refining; Vaporization; Reduction process; Acid leaching; METALLURGICAL GRADE SILICON; THERMODYNAMICS; PURIFICATION; PHOSPHIDE; CALCIUM;

D O I：

10.1016/j.solmat.2011.02.001

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Production of solar cells has increased rapidly in recent years, and metallurgical production of solar grade silicon (SoG-Si), has increased compared with more expensive processes such as Siemens process and Cz processes. It is important to understand the thermodynamic behavior of phosphorus in slag for optimized refinement of SoG-Si. In this study, the thermodynamic behavior of phosphorus in the CaO-SiO2-CaF2 slag system was investigated at 1773 K for various oxygen potential and slag composition. In addition, evaporation of phosphorus in the reduction process was observed during slag refining by addition of H-2 gas. Experimental results showed that the stability of phosphorus in slag depends on both the O2- (basicity) content of the slag and the solubility of Ca in silicon, and the dissolution mechanism of phosphorus into slag was derived. Results confirmed that phosphorus and calcium in molten silicon were also removed by acid leaching. The effective removal of phosphorus for SoG-Si using several refining processes was evaluated quantitatively. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：1779 / 1784

页数：6

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