Method for processing silicon powder to obtain silicon crystals

C - Chemistry – Metallurgy – 30 – B

Patent

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Details

C30B 9/10 (2006.01) C01B 33/021 (2006.01) C01B 33/037 (2006.01) C30B 9/06 (2006.01)

Patent

CA 2700997

Embodiments of the present invention relate to a process for obtaining silicon crystals from silicon. The method includes contacting silicon powder with a solvent metal to provide a mixture containing silicon, melting the silicon under submersion to provide a first molten liquid, contacting the first molten liquid with a first gas to provide dross and a second molten liquid, separating the dross and the second molten liquid, cooling the second molten liquid to form first silicon crystals and a first mother liquid and separating the first silicon crystals and the first mother liquid.

Selon certains modes de réalisation, la présente invention concerne un procédé permettant d'obtenir des cristaux de silicium à partir du silicium. Le procédé comprend la mise en contact d'une poudre de silicium avec un métal solvant pour obtenir un mélange contenant du silicium, la fusion du silicium sous immersion pour obtenir un premier liquide en fusion, la mise en contact du premier liquide en fusion avec un premier gaz pour obtenir un laitier et un second liquide en fusion, la séparation du laitier du second liquide en fusion, le refroidissement du second liquide en fusion pour former des premiers cristaux de silicium et une première solution mère et la séparation des premiers cristaux de silicium de la solution liqueur mère.

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