Method for deinstallation of rod pairs of polysilicon produced by the Siemens process

摘要

Polycrystalline silicon is produced by depositing polycrystalline silicon onto U-shaped slim rods, deinstalling at least one polycrystalline silicon rod pair from the reactor, removing graphite residues from the electrode-side ends of the polycrystalline silicon rods of the polycrystalline silicon rod pair, and comminuting the polycrystalline silicon rods into rod pieces or into chunks, wherein prior to deinstallation of the polycrystalline silicon rod pairs from the reactor, the polycrystalline silicon rod pairs are at least partially with a plastics material bag made of a plastics material film having a thickness of more than 150 μm, wherein the plastics material bag comprises weights at its opening. The invention further relates to a polycrystalline silicon rod pair which has a rod diameter of 190 mm or more and is covered by a plastics material bag made of a plastics material film having a thickness of more than 150 μm.