Abstract: A device for removing polycrystalline silicon rod pairs from a Siemens reactor has a body dimensioned to fit over a single rod pair. Once the rod pair is within the body, the body and enclosed rod pair is removed.

Abstract: Comminuted polysilicon with reduced contamination is prepared using multi-step comminution employing comminution with comminution tools of differing tungsten carbide content and/or grain size.

Abstract: A device for removing polycrystalline silicon rod pairs from a Siemens reactor has a body dimensioned to fit over a single rod pair. Once the rod pair is within the body, the body and enclosed rod pair is removed.

Abstract: A method for mechanically classifying polycrystalline silicon chunks or granules with a vibratory screening machine, involves setting silicon chunks or granules present on one or more screens each comprising a screen lining in vibration such that the silicon chunks or silicon granules perform a movement which causes the silicon chunks or silicon granules to be separated into various size classes, wherein a screening index is greater than or equal to 0.6 and less than or equal to 9.0.

Abstract: A device for removing polycrystalline silicon rod pairs from a Siemens reactor has a body dimensioned to fit over a single rod pair. Once the rod pair is within the body, the body and enclosed rod pair is removed.

Abstract: Polycrystalline silicon fragments are sorted into defined particle fractions in a flexible manner independent of initial particle size distribution and desired fraction size by a first mechanical screening into a fine fraction and residual fraction, followed by optoelectronic sorting of the residual fraction.

Abstract: Siemens reactors for polysilicon deposition may employ faster and/or more economical deposition conditions without reduction in yield, by pre-sorting polysilicon rods into different quality classifications prior to comminution, and further sorting the polysilicon fragments in each classification into further classifications.

Abstract: Production of highly pure comminuted polycrystalline silicon from polycrystalline silicon rods produced by the Siemens process is facilitated by removal of graphite residues from the electrode ends of the rods by removing the contaminated end portions by means of mechanical impulses.

Abstract: A method for mechanically classifying polycrystalline silicon chunks or granules with a vibratory screening machine, involves setting silicon chunks or granules present on one or more screens each comprising a screen lining in vibration such that the silicon chunks or silicon granules perform a movement which causes the silicon chunks or silicon granules to be separated into various size classes, wherein a screening index is greater than or equal to 0.6 and less than or equal to 9.0.

Abstract: Puncturing of plastic bags containing polysilicon chunks during transport thereof and reduction of fines generation are minimized by use of a transport vessel containing at least two plastic bags containing polysilicon chunks with a packing density of greater than or equal to 500 kg/m3.

Abstract: The invention provides chunk polycrystalline silicon having a concentration of carbon at the surface of 0.5-35 ppbw. A process for cleaning polycrystalline silicon chunks having carbon contaminations at the surface, includes a thermal treatment of the polycrystalline silicon chunks in a reactor at a temperature of 350 to 600° C., the polycrystalline silicon chunks being present in an inert gas atmosphere during the thermal treatment, and the polycrystalline silicon chunks after the thermal treatment having a concentration of carbon at the surface of 0.5-35 ppbw.

Abstract: The present invention relates to a method for packing polysilicon in the form of chunks by introducing the chunks into a first plastic bag, the first plastic bag being introduced into a second plastic bag after the introduction of the chunks, or the first plastic bag already having been inserted into the second plastic bag prior to the introduction of the chunks into the first plastic bag, as a result of which the chunks are present in a double bag which is sealed, wherein the air present in the two plastic bags in the double bag after the introduction of the chunks is removed before the sealing of the double bag such that the total volume of the double bag relative to the volume of the chunks is 2.4 to 3.0.

Abstract: Production of highly pure comminuted polycrystalline silicon from polycrystalline silicon rods produced by the Siemens process is facilitated by removal of graphite residues from the electrode ends of the rods by removing the contaminated end portions by means of mechanical impulses.

Abstract: The invention provides a polycrystalline silicon rod having a total diameter of at least 150 mm, including a core A having a porosity of 0 to less than 0.01 around a thin rod, and at least two subsequent regions B and C which differ in porosity by a factor of 1.7 to 23, the outer region C being less porous than region B.

Abstract: Polycrystalline silicon rods produced by the Siemens process produce a higher yield of CZ crystals when the process parameters are modified in a second stage of deposition such that an outer layer of larger crystallites having a mean swize >20 ?m is produced. Harvesting of these polycrystalline rods and conventional rods by enclosing them in a plastic bag or sheath prior to removal from the reactor also surprisingly increase the yield of CZ crystals grown from a melt containing the sheathed rods.

Abstract: A method for mechanically classifying polycrystalline silicon chunks or granules with a vibratory screening machine, involves setting silicon chunks or granules present on one or more screens each comprising a screen lining in vibration such that the silicon chunks or silicon granules perform a movement which causes the silicon chunks or silicon granules to be separated into various size classes, wherein a screening index is greater than or equal to 0.6 and less than or equal to 9.0.

Abstract: Comminuted polysilicon with reduced contamination is prepared using multi-step comminution employing comminution with comminution tools of differing tungsten carbide content and/or grain size.

Abstract: Puncturing of plastic bags containing polysilicon chunks during transport thereof and reduction of fines generation are minimized by use of a transport vessel containing at least two plastic bags containing polysilicon chunks with a packing density of greater than or equal to 500 kg/m3.

Abstract: Siemens reactors for polysilicon deposition may employ faster and/or more economical deposition conditions without reduction in yield, by pre-sorting polysilicon rods into different quality classifications prior to comminution, and further sorting the polysilicon fragments in each classification into further classifications.

Abstract: A device for removing polycrystalline silicon rod pairs from a Siemens reactor has a body dimensioned to fit over a single rod pair. Once the rod pair is within the body, the body and enclosed rod pair is removed.