Treatment of molten light metals and apparatus
US4931091A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1989 |
| Grant date | Jun 5, 1990 |
| Priority date | — |
| Expiry date | Jun 7, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B21/066
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An apparatus and process are described for treating molten metal. The invention comprises: (a) a heated vessel having inlet and outlet means for the continuous flow of molten metal downwardly through the vessel, (b) a perforated plate extending horizontally across the vessel dividing it into an upper treatment section and a lower treatment section, this plate forming an intermediate treatment section, and (c) a device for injecting gas in the form of small discrete bubbles into the metal in the lower treatment section, this device comprising a hollow rotatable shaft extending downwardly through an opening in the plate with drive means coupled to the upper end of the shaft, a vaned rotor fixedly attached to the lower end of the shaft within the lower treatment section, with one or more passageways within the rotor for conducting gas from the interior of the shaft to the metal in the lower treatment section. When the gas is discharged through the rotor and the rotor is rotated, the gas is injected into the metal in the form of small discrete bubbles which are uniformly dispersed within the lower treatment section. In a preferred embodiment of the invention the gas bubbles move from t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.