Process for preparing silicon and optionally aluminum and...

C - Chemistry – Metallurgy – 25 – B

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C25B 1/00 (2006.01) C25C 3/06 (2006.01) C25C 3/36 (2006.01) C25C 7/08 (2006.01)

Patent

CA 2439384

Process for preparing highly purified silicon and optionally aluminum and silumin (aluminum silicon alloy) in the same cell, wherein silicate and/or quartz containing rocks are subjected to electrolysis in a salt melt containing fluoride, whereby silicon and aluminum are formed in the same bath, and aluminum formed, which may be low alloyed, flow to the bottom and is optionally drawn off, and deposit formed on the cathode is removed from the cathode and crushed, optionally together with the remaining electrolysis bath, concentrated sulfuric acid and then hydrochloric acid and water are added to the crushed material, liberated Si-grains float to the surface and are taken out and treated further as desired.

L'invention concerne un procédé de préparation de silicium hautement purifié et éventuellement d'aluminium et de silumin (alliage aluminium-silicium) dans la même cellule. Selon ce procédé, (1) des roches de silicium et/ou de quartz sont soumises à l'électrolyse dans un mélange salé contenant du fluorure, le silicium et l'aluminium étant formés dans le même bain, l'aluminium formé, qui peut être faiblement allié, s'écoule vers le fond, et est éventuellement évacué ; (2) le dépôt formé sur la cathode est supprimé et concassé, éventuellement avec le bain d'électrolyse restant, puis, de l'acide sulfurique concentré, de l'acide chlorhydrique et de l'eau sont ajoutés au matériau concassé, les grains de Si libérés flottants sur la surface étant récupérés et traités à volonté.

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