Silicon powder and method for production of silicon powder
US5128116A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1990 |
| Grant date | Jul 7, 1992 |
| Priority date | — |
| Expiry date | Jan 11, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F7/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a method for continuous production of silicon powder comprising the combination of the following steps: PA1 a) continuous production of silicon in an electric smelting furnace, PA1 b) refining and alloying of the molten silicon in a metal treatment vessel, PA1 c) continuous supply of modern silicon from the metal treatment vessel to a holding furnace, PA1 d) continuous supply of molten silicon to a closed atomizing apparatus wherein the molten silicon is atomized by means of an inert gas supplied from a pressure vessel or a compressor unit, PA1 e) continuous removal of atomized silicon powder from the atomizing apparatus, PA1 f) separation of atomized silicon powder and inert gas in a solid/gas separator, PA1 g) screening of the silicon powder into preset particle size fractions, PA1 h) supply of the different particle size fractions of silicon powder to closed product silos, PA1 i) filtration of the inert gas from step f) for removing any remaining solid particles from the inert gas, PA1 cooling and compressing the inert gas from step i) and recycling of the compressed inert gas to the pressure vessel or directly to the atomizing apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.