摘要:
In a reactor for the decomposition of a silicon-containing gas, provision is made, to avoid silicon deposition on an inner wall of a reactor vessel, for at least one catalytically active mesh to be provided within a reaction chamber between at least one gas feed line and the inner wall (4). The mesh accelerates the thermal decomposition of the gas and reduces the deposition of silicon on the inner wall. Also described is a process for the preparation of silicon using the reactor according to the invention and the use in photovoltaics of the silicon prepared.
摘要:
In a reactor for the decomposition of a silicon-containing gas, provision is made, to avoid silicon deposition on an inner wall of a reactor vessel, for at least one catalytically active mesh to be provided within a reaction chamber between at least one gas feed line and the inner wall (4). The mesh accelerates the thermal decomposition of the gas and reduces the deposition of silicon on the inner wall. Also described is a process for the preparation of silicon using the reactor according to the invention and the use in photovoltaics of the silicon prepared.
摘要:
A reactor for separating a gas containing silicon is provided with at least one electrically heatable deposition element of silicon to save costs, which element has a doping with at least one impurity to improve its electrical conductivity, the doping having a concentration in an initial state, such that the deposition element with the silicon deposited thereon in the final state is suitable for the manufacture of silicon melt for the production of polycrystalline silicon blocks or single silicon crystals for photovoltaics. A method for manufacturing silicon with the reactor according to the invention and the use of the manufactured silicon in photovoltaics are also described.
摘要:
Compacting device for the low-metal compaction of a powder with a casing which at least in part surrounds a working chamber, with a feed arrangement arranged on the casing and feeding a powder, which is to be compacted, into the working chamber, with at least a compacting roller which is rotatably arranged in the working chamber, comprises a roller jacket and, together with an opposing wall, forms a compacting gap for compacting the powder therein, characterised in that the at least one compacting roller consists of ceramic, at least on the roller jacket.
摘要:
Compacting device for the low-metal compaction of a powder with a casing which at least in part surrounds a working chamber, with a feed arrangement arranged on the casing and feeding a powder, which is to be compacted, into the working chamber, with at least a compacting roller which is rotatably arranged in the working chamber, comprises a roller jacket and, together with an opposing wall, forms a compacting gap for compacting the powder therein, characterised in that the at least one compacting roller consists of ceramic, at least on the roller jacket.
摘要:
Method for producing silicon which is suitable as a starting material for producing a silicon melt for the fabrication of silicon blocks or silicon crystals, comprising the following steps: introducing a gaseous mixture of monosilane and hydrogen into a reactor, thermal degrading the gaseous mixture for forming silicon powder, separating the formed silicon powder produced from the gaseous mixture, and mechanical compacting the separated silicon powder with compacting rollers which having a roller jacket consisting of a ceramic material selected from graphite, glass and silicon nitride.
摘要:
Method for producing silicon which is suitable as a starting material for producing a silicon melt for the fabrication of silicon blocks or silicon crystals, comprising the following steps: introduction of a gaseous mixture of monosilane and hydrogen into a reactor, thermal degradation of the gaseous mixture with formation of silicon powder, separation of the silicon powder obtained from the gaseous mixture, and mechanical compacting of the separated silicon powder.
摘要:
A device for the thermal decomposition of a volatile compound, and for deposition of particles which are formed by the decomposition, includes (a) a pressure vessel, (b) at least one reaction tube located inside the pressure vessel such that, an open end of the reaction tube extends into the pressure vessel and an other end of the reaction tube is located outside the pressure vessel and is provided with a gas feed, wherein a longitudinal axis of the reaction tube is oriented in the direction of gravity and parallel to a longitudinal axis of the pressure vessel and wherein the reaction tube can be heated on a gas inlet side and cooled on a gas outlet side, wherein the pressure vessel, in its lower part, comprises a collection cone, wherein the open end of the at least one reaction tube extends into a gas space of the collection cone, wherein the collection cone is connected to an outlet lock for particles, and (c) a gas outlet unit located mainly inside the pressure vessel, the gas outlet unit comprising a gas guide, a gas inlet region, wherein the gas inlet region is in communication with the gas space of the collection cone, a filter system, and a gas outlet, which is located outside the pressure vessel.
摘要:
The present invention relates to a process for producing silicon by thermal decomposition of a gaseous mixture comprising monosilane, monochlorosilane and, if desired, further chlorosilanes, e.g. dichlorosilane.
摘要:
Provided is a plant for the continuous production of monosilane and tetrachlorosilane by catalytic dismutation of trichlorosilane, wherein the plant contains: a countercurrent reactor having a double wall, a catalyst bed containing a catalyst which is located in the countercurrent reactor, a condenser at the top of the countercurrent reactor, a vaporizer unit at the bottom of the countercurrent reactor, a trichlorosilane feed line for the introduction of trichlorosilane into the countercurrent reactor, a heat exchanger, with the trichlorosilane conveyed by line via the heat exchanger and preheated there by a bottom product from the vaporizer unit and, for this purpose, the bottom product is fed by line via the heat exchanger into the double wall at a level in the lower part of the countercurrent reactor and discharged from the double wall at a level in the upper part of the countercurrent reactor, a condensation unit downstream of the condenser, and a distillation column having an outlet for monosilane.