Multiple chamber material-stirring lance and method
US10344343B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Feb 14, 2017 |
| Grant date | Jul 9, 2019 |
| Priority date | — |
| Expiry date | Oct 8, 2037 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27D2027/002
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A multiple chamber material-stirring lance and method used to treat molten metal in a ladle, the lance having a stirring gas chamber, and a plurality of gas permeable ports arranged at a terminal end of the gas chamber, and at least one material chamber positioned parallel to the gas chamber and terminating in a plurality of material ports. In use, the multiple chamber material-stirring lance is lowered into the ladle of molten metal, and gas and material are both introduced into a respective chamber and emitted through their respective ports. Stirring gas emitted through the gas permeable ports under a gas pressure between 40 and 600 cfm causes the stirring gas to create a boiling effect in the molten metal, drawing material into the stirring gas bubbles and away from the lance body, improving material dispersion efficiency and thus impurity extraction from the molten metal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.