Production of high purity silicon by a heterogeneous arc heater reduction
US4239740A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 1979 |
| Grant date | Dec 16, 1980 |
| Priority date | — |
| Expiry date | May 25, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B33/033
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for converting silicon intermediates to high purity silicon by an arc heater characterized by the steps of preliminarily reacting gaseous silicon intermediate, such as a silicon halide, with a metal reductant, such as sodium, to form preliminary reaction products including small solid silicon particles and droplets of salt of the metal reductant, at temperatures below the boiling point of the metal reductant, subsequently heating the reaction products to temperatures above said boiling point in an arc heater chamber to convert the reaction products to droplets of silicon to merge and form larger silicon droplets, and thereafter separating the mixture of silicon droplets and salt vapor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.