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T-Space at The University of Toronto Libraries >
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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/24595

Title: Synthesis of High Purity Silicon from Rice Husks
Authors: Larbi, Kingsley Kweku
Advisor: Barati, Mansoor
McLean, Alexander
Department: Materials Science and Engineering
Keywords: silicon
rice husks
synthesis
reduction
leaching
RHA
high purity
solar grade silicon
magnesium
refining
Quantitative XRD
ICP
Issue Date: 27-Jul-2010
Abstract: Impurity optimized silicon is needed for the advancement of terrestrial photovoltaic power generation. In this study the possibility of producing solar grade silicon from rice husks has been pursued. An integrated process flowsheet was developed and practiced that included initial leaching, reduction of Rice husk ash (RHA) and post-reduction purification of silicon. Metallothermic reduction of purified RHA with magnesium was investigated within the temperature range of 500-950 oC. The reduction product was purified by two stage acid leaching sequence. Analysis of the final silicon powder product by XRD and ICP-OES showed crystalline silicon with boron content to be less than 3ppm- corresponding to reduction by a factor greater than 10, whilst the phosphorus content was reduced by a factor of over 20 and reaching less than 73ppm. The effects of temperature, magnesium amount and leaching agents were optimized in this study. A one step test melting was also carried out to convert the silicon powder into silicon chunks.
URI: http://hdl.handle.net/1807/24595
Appears in Collections:Master
Department of Materials Science & Engineering - Master theses

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