NDLI: Purification of metallurgical silicon using iron as impurity getter, part II: Extent of silicon purification

Content Provider	Springer Nature Link
Author	Esfahani, Shaghayegh Barati, Mansoor
Copyright Year	2011
Abstract	Purification of metallurgical grade silicon (MG-Si), using iron as the impurity getter has been investigated. The technique involves growing Si dendrites from an alloy of MG-Si with iron, followed by their separation using a gravity based technique and acid leaching. The effects of cooling rate of the alloy and the subsequent quenching temperature on the segregation of the impurities were studied. It was found that slow cooling of the alloy below the eutectic temperature causes an increase in the Si impurity concentration due to diffusion of the impurities from the alloy to the Si. Quenching the alloy from temperatures above the eutectic eliminated this effect, increasing the purity of the Si product. A significant reduction in the concentration of the major impurities was achieved, making the Si product a suitable feedstock for solar grade silicon generation. The concentrations, in ppmw, of some elements in the Si product are Al: 10, B: 2, Mn: 3, Ni: 3, Cr: 1, Fe: 1, P: 29. Other impurities including V, Ba, Li, Be, and Mg were all below 0.5 ppmw.
Starting Page	1009
Ending Page	1015
Page Count	7
File Format	PDF
ISSN	15989623
Journal	Metals and Materials
Volume Number	17
Issue Number	6
e-ISSN	20054149
Language	English
Publisher	The Korean Institute of Metals and Materials
Publisher Date	2011-12-27
Publisher Place	Springer
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	silicon purification solvent refining metallurgical grade silicon solar grade silicon Continuum Mechanics and Mechanics of Materials Engineering Thermodynamics, Heat and Mass Transfer Operating Procedures, Materials Treatment Metallic Materials Characterization and Evaluation of Materials Magnetism, Magnetic Materials
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Condensed Matter Physics

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