Thermal reduction process for production of magnesium
US4478637A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1983 |
| Grant date | Oct 23, 1984 |
| Priority date | — |
| Expiry date | Mar 10, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B26/22
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Magnesium is produced by a thermal reduction process in a reaction-condensation system having a reaction zone and a condensation zone. According to this process, a reducing agent containing ferrosilicon and at least 25 wt. % aluminum is contacted in the reaction zone with a calcium-silicon-aluminum-magnesium oxide slag to produce magnesium vapor. The magnesium vapor is transported from the reaction zone to the condensation zone and condensed therein. The slag is maintained to contain from 1 to 8 wt. % MgO, at least 9 wt. % Al.sub.2 O.sub.3, and have a CaO/SiO.sub.2 weight ratio no less than that provided by the formula 2.1+0.03 (wt. % Al.sub.2 O.sub.3 -9). The slag is also maintained so as to decrepitate upon cooling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.