METHOD FOR RECOVERING AND/OR RECYCLING MATERIAL

摘要

The invention relates to a method for recovering and/or recycling starting silicon material by crushing the starting material. The recovered or recycled material is melted, and crystals, e.g. as a silicon block, tube, or strip, are grown from the obtained melt. In order to be able to use also starting materials that have a high aspect ratio so as to be able to convey the same without any problem, broken polycrystalline needle-shaped Si material (material I) which contains particles that have an aspect ratio A₁, 5 < A₁ = 30, is used as a starting material. Material I is crushed in such a way that the crushed particles (material II) substantially have an aspect ratio A_II < 3. Alternatively, a broken Si wafer is used that is composed of laminar particles which are crushed in such a way that the crushed particles (material III) essentially have an aspect ratio A_III < 3.