Process for the recovery of magnesium from magnesium alloys waste
US5476529A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 23, 1994 |
| Grant date | Dec 19, 1995 |
| Priority date | — |
| Expiry date | Nov 23, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for recovery of magnesium from magnesium alloy waste by charging an electric furnace with a flux including at least one salt, the flux being inert with respect to magnesium and having a melting point <1000.degree. C. The flux is raised by the Joule effect at a reduced pressure to a temperature of 900.degree. to 1100.degree. C. to produce a bath having a density higher than that of magnesium, a vapor pressure <0.1 torr and an electrical resistivity of between 1 and 10 milliohm.m. The magnesium alloy waste is introduced in the bath, and magnesium and any other elements in the waste which are more volatile than magnesium are recovered from a vapor phase above the bath. Any elements in the waste which are less volatile than magnesium are recovered from a molten phase in a bottom portion of the furnace.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.