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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/25570

Title: Solvent Refining of Metallurgical Grade Silicon Using Iron
Authors: Shaghayegh, Esfahani
Advisor: Mansoor, Barati
Department: Materials Science and Engineering
Keywords: Metallurgical Grade Silicon
Solar Grade Silicon
Solvent Refining
Heavy Medium
Physical Separation
Gettering
Issue Date: 31-Dec-2010
Abstract: Purification of metallurgical grade silicon (MG- Si) by a combination of solvent refining and physical separation has been studied. MG-Si was alloyed with iron and solidified under different cooling rates to grow pure Si dendrites from the alloy. The Si dendrites and FeSi2 that were formed after solidification were then separated by a gravity-based method. The separation method relies on significantly different densities of Si and FeSi2, and uses a heavy liquid with specific gravity between the two phases to float the former on the surface of a heavy liquid, while the latter sinks to the bottom. The effect of particle size and cooling rate on the Si yield and separation efficiency of the Si phase was investigated. The floated Si particles were further purified by removing the physically adherent Fe-Si phase, using an acid leaching method. Analysis of the produced silicon indicates that several impurity elements including P and B can be efficiently removed using this simple and low-cost technique.
URI: http://hdl.handle.net/1807/25570
Appears in Collections:Master
Department of Materials Science & Engineering - Master theses

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