Process for the preparation of silicon or ferrosilicon
US4269620A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 24, 1979 |
| Grant date | May 26, 1981 |
| Priority date | — |
| Expiry date | May 24, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B33/025
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for the production of silicon or ferrosilicon by reduction of silicon oxide, optionally in the presence of iron oxide, by means of a carbonaceous reducing agent in a reduction furnace. The furnace operation is simplified and the yield is increased by making the supply of energy and the supply of silicon oxide, respectively, independent of each other and by adjusting the ratio between them in such a manner that the gases leaving the furnace have a silicon monoxide content below 10 mole percent. A controlled supply of at least a part of the silicon oxide to the hotter parts of the furnace can be used as a means of making the supply of energy and the supply of silicon oxide reciprocally adjustable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.