Use of acid washing to provide purified silicon crystals

Details Use of acid washing to provide purified silicon crystals Use of acid washing to provide purified silicon crystals

C - Chemistry, Metallurgy

30

B

C30B 9/10 (2006.01) C01B 33/037 (2006.01) C30B 29/06 (2006.01) C30B 33/00 (2006.01)

Patent

CA 2694806

A method for purifying silicon wherein silicon is crystallized from a solvent metal. The method comprises the steps of providing a molten liquid containing silicon, a solvent metal and impurities, cooling the molten liquid to form first silicon crystals and a first mother liquor, separating the first silicon crystals from the first mother liquor, contacting the first silicon crystals with compound which will dissolve the first mother liquor and separating the washed crystals from the wash solution.

L'invention porte sur un procédé de purification de silicium, selon lequel du silicium est cristallisé à partir d'un métal solvant. Le procédé comprend les étapes consistant à : se procurer un liquide fondu contenant du silicium, un métal solvant et des impuretés, refroidir le liquide fondu afin de former des premiers cristaux de silicium et une première liqueur-mère, séparer les premiers cristaux de silicium de la première liqueur-mère, mettre en contact les premiers cristaux de silicium avec un composé qui dissoudra la première liqueur-mère et séparer les cristaux lavés de la solution de lavage.

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