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AssigneeSolarworld Aktiengesellschaft
InventorsHans-Dieter Block, Udo Krauter, Peter Schreckenberg
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The invention relates to a method and a device for producing globular grains of high-purity silicon by atomising a silicon melt (6) in an ultrasonic field (10). Globular grains having a grain size of 50 μm can be produced by means of said method and device and can be used to separate high-purity silicon from silane in the fluid bed. The silicon melt (6) is fed into the ultrasonic field (10) at a distance of <50 mm in relation to a field node, and the atomised silicon leaves the ultrasonic field (10) at a temperature close to the liquidus point. The invention also relates to a use of the product produced according to the inventive method or using the inventive device, as particles for producing high-purity silicon from silane in a fluid bed.
A method for producing globular grains of high-purity silicon by atomising a silicon melt in an ultrasonic field inside a pressurised chamber filled with inert gas, wherein the melt is fed into said ultrasonic field above a field node, with the atomised silicon leaving the ultrasonic field at a temperature near the liquefaction point so that the solidified globular grains essentially adopt a grain size of between 50 μm and 300 μm.
Dependencies are inferred from the claim text.