METHOD AND APPARATUS FOR PURIFYING SILICON

摘要

The invention relates to a novel method for purifying silicon, in particular in order to obtain solar grade silicon, and an apparatus for realizing the method. The apparatus for purifying silicon comprises: a chamber, which is longitudinally extending and of dimensions such as to receive a vessel for containing silicon; means for heating a selected portion of said chamber; the heating means and the chamber being movable with respect to each other in a direction that is parallel to the longitudinal extension of the chamber (1) in order to realize a directional solidification of the silicon contained inside the vessel, when the vessel is placed inside the chamber. The method for purifying silicon, comprises the steps of: introducing a vessel containing silicon internally of a longitudinally-extending chamber; predisposing means for heating a selected portion of the chamber; performing a relative movement of the heating means and the chamber In a direction that is parallel to the longitudinal extension of the chamber in order to obtain a directional solidification of the silicon contained in the vessel.