Treating molten aluminum
US4384888A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 3, 1981 |
| Grant date | May 24, 1983 |
| Priority date | — |
| Expiry date | Aug 3, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B21/066
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Molten metal, such as aluminum, is passed through a media of submerged contacting surfaces such as a filter bed. The contacting media is selected to provide a void fraction of at least one-half and a specific surface area of at least 50 sq. ft. per cubic ft. of media. The metal moving therethrough can be contacted with a gas. In the case of aluminum, the gas may be a nonreactive gas with or without a halogenaceous or chlorinaceous gas added thereto. The process removes solid, gas and metallic impurities from the molten metal and is capable of extremely long periods of operation without replacement of the contact media. Operating life is enhanced by periodic cleaning of the contact media by a high flow gas purge which disturbs the media to dislodge particles contained therein causing the particles to rise out of the media. Metal flow through the media is preferably curtailed during the purge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.