Coaxial material-stirring lance and method of use
US10240218B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jun 15, 2016 |
| Grant date | Mar 26, 2019 |
| Priority date | — |
| Expiry date | Dec 11, 2036 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27D2003/169
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A coaxial material-stirring lance (40) and method used to treat molten metal in a ladle, the lance having a stirring gas chamber (48), and a plurality of gas permeable ports (50 52) arranged as upper and lower port arrays along a length of the gas chamber, and at least one material chamber (43) positioned inside and coaxial with the gas chamber and terminating in at least one material ports (60). In another embodiment, a second material chamber is included inside the gas chamber, parallel to and immediately adjacent the material chamber. In use, the coaxial material-stirring lance is lowered into the ladle of molten metal, and gas and material are both introduced into a respective chamber. Gas mixes material through the molten metal, causing impurities to be removed from the metal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.