Process Research Ortech Inc.

Raja Roy

Ramamritham Sridhar

Vaikuntam Iyer Lakshmanan

Mansoor Barati

Kingsley Kweku Larbi

A process to the production of silicon from amorphous silica is disclosed. The amorphous silica is formed from a material rich in silica, especially rice husk ash or silica fume. The process comprises subjecting the amorphous silica to leaching with a lixiviant of aqueous mineral acid, especially hydrochloric acid. Preferably, material rich in silica is roasted at a temperature of not more than 850&#xb0; C., subjected to leaching and then subjected to a second roasting at a temperature of less than 750&#xb0; C. The process provides for the production of high purity silicon, especially to the production of solar grade silicon (SoG-Si).

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Mississauga, Canada

Raja Roy